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List of Freshwater Fishes reported from Mexico
n = 588
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Table 1: 577 species currently present in the country/island (endemic, native, introduced, reintroduced);
Table 2: 3 species possibly present in the country/island (stray, questionable);
Table 3: 8 species demonstrated to be absent in the country/island (extirpated, not established, misidentification, error).
Table 4: 588 species reported from the country/island altogether.
Table : 588 .
     
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Family Species Author Info Occurrence Common names Abundance Max length Maturity Remark Photo
Achiridae Achirus mazatlanus (Steindachner, 1869) Fr, Br, M, Fi native  Pacific lined sole (Spanish), Tepalcate (Spanish), Sol (Spanish), Sol de Mazatlán (Spanish), Tepalcate (Spanish)  22.50 cm TL male/unsexed  Recorded from several localities in Baja California Sur (Ref. 37955). Also Ref. 50313, 58469. 
Acipenseridae Acipenser medirostris Ayres, 1854 Fr, Br, M native  Esturión verde (Spanish), Esturión verde (Spanish)  270 cm TL male/unsexed  Known from Ensenada, northern Baja California (Ref. 96339). Also Ref. 2850, 6792. 
Acipenseridae Acipenser transmontanus Richardson, 1836 Fr, Br, M native  Esturión blanco (Spanish), Esturión blanco (Spanish)  610 cm TL male/unsexed  Ranges south to northern Baja California (Ref. 2850). Also Ref. 6792, 27436, 96339. 
Leuciscidae Agosia chrysogaster Girard, 1856 Fr native  Pupo panzaverde (Spanish)  10.00 cm TL male/unsexed  Also Ref. 5723. 
Leuciscidae Algansea amecae Pérez-Rodríguez, Pérez-Ponce de León, Domínguez-Domínguez & Doadrio, 2009 Fr endemic  Ameca chub (English), Pupo del Ameca (Spanish)  10.10 cm SL male/unsexed    No picture yet.
Leuciscidae Algansea aphanea Barbour & Miller, 1978 Fr, Thr native  Riffle chub (English), Pupo del Ayutla (Spanish)   Type locality: Río Ayutla, 10 km west of jct. of Mascota road with hwy 80, ca. 4.8 km southeast of Ayutla, Jalisco (Ref. 33021). Status of threat: endangered. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Algansea avia Barbour & Miller, 1978 Fr, Thr native  Remote chub (English), Pupo de Tepic (Spanish)   Type locality: Trib. to Río Grande de Santiago, ca. 4.8 km northeast of hwy 15 to Santa María del Oro, Nayarit (Ref. 33021). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Algansea barbata Álvarez & Cortés, 1964 Fr, Thr native  Lerma chub (English), Pupo del Lerma (Spanish) scarce (very unlikely)  Endemic to the Lerma River basin. Endangered, possibly extinct (Ref. 27639). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Algansea lacustris Steindachner, 1895 Fr, Thr native  Pátzcuaro chub (English), Acúmara (Spanish)   Endemic to the Lerma River basin. Questionable stable. Status of threat: vulnerable. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Algansea monticola Barbour & Contreras-Balderas, 1968 Fr native  Mountain chub (English), Pupo del Juchipila (Spanish)   Type locality: Río Juchipila, near Jalpa, at hwy 70 bridge, 1 mi. east of intersection with hwy 41, Zacatecas, Mexico (Ref. 33021).  No picture yet.
Leuciscidae Algansea popoche (Jordan & Snyder, 1899) Fr, Thr native  Popoche chub (English), Popocha (Spanish)   Endemic to the Lerma River basin. Abundance declining, threatened. Type locality: Laguna de Chapala, near Ocotlán, Jalisco, Mexico. Status of threat: endangered. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Algansea tincella (Valenciennes, 1844) Fr, Thr native  Spottail chub (English), Pupo del Valle (Spanish)   Range contracting in Lerma river basin (Ref. 27639). Also Ref. 84762. Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allodontichthys hubbsi Miller & Uyeno, 1980 Fr, Thr endemic  Whitepatched splitfin (English), Mexcalpique de Tuxpan (Spanish)  6.00 cm TL male/unsexed  Endemic to the freshwaters of Jalisco (Ref. 4537). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allodontichthys polylepis Rauchenberger, 1988 Fr, Thr endemic  Finescale splitfin (English), Mexcalpique escamitas (Spanish)  4.50 cm SL male/unsexed ;5.00 cm SL female  Occurs in the upper reaches of the Rio Ameca basin in Jalisco (Ref. 26130). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allodontichthys tamazulae Turner, 1946 Fr, Thr endemic  Peppered splitfin (English), Mexcalpique de Tamazula (Spanish)   Found in Tuxpan River system, Jalisco (Ref. 4537). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allodontichthys zonistius (Hubbs, 1932) Fr, Thr endemic  Bandfin splitfin (English), Mexcalpique de Colima (Spanish)  4.50 cm SL male/unsexed ;5.00 cm female  Known from the Rio Calima (Ref. 26130). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Alloophorus robustus (Bean, 1892) Fr endemic  Bulldog goodeid (English), Chegua (Spanish)  12.00 cm TL male/unsexed 6.9 SL Found in Lerma River basin. Range contracting in the 1990s (Ref. 27639). Also Ref. 4537, 84762. 
Goodeidae Allotoca catarinae (de Buen, 1942) Fr, Thr endemic  Catarina allotoca (English), Tiro Catarina (Spanish)  5.00 cm TL male/unsexed ;8.00 cm female  Known from Santa Catarina lagoon in Michoacan (Ref. 26130). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allotoca diazi (Meek, 1902) Fr, Br, Thr endemic  Patzcuaro allotoca (English), Chorumo (Spanish)  10.00 cm TL male/unsexed ;12.00 cm female  Restricted to Patzcuaro and Rancho El Morino, Michoacan. Found in Lake Patzcuaro which has no outlet, making its water slightly brackish. Population stable in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allotoca dugesii (Bean, 1887) Fr, Thr endemic  Bumblebee allotoca (English), Tiro chato (Spanish)  6.50 cm TL male/unsexed  Endemic to the Lerma River basin. Range contracting, threatened (Ref. 27639). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allotoca goslinei Smith & Miller, 1987 Fr, Thr endemic  Banded allotoca (English), Tiro listado (Spanish)  6.00 cm TL male/unsexed  Type locality, Río Potrero Grande, about 10 km W of toen of Ameca on road to Atenguillo, Jalisco, UMMZ 213450 (holotype of Allotoca goslinei, 3.43 cm SL, mature male) (Ref. 58357). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Allotoca maculata Smith & Miller, 1980 Fr, Thr endemic  Blackspot allotoca (English), Tiro manchado (Spanish)  6.50 cm TL male/unsexed ;7.50 cm female  Restricted to the lagoon of Santa Magdalena and Etzatlan in Jalisco. Found in flat regions and swampy areas of the isolated Santa Magdalena basin (Ref. 26130). Believed to be extinct since 1984 but it was rediscovered in February 1990 (Ref. 32716). Also Ref. 4537. Status of threat: endangered; status improved since 1989 listing. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Allotoca meeki (Álvarez, 1959) Fr, Thr endemic  Zirahuen allotica (English), Tiro de Zirahuén (Spanish), Zirahuen allotoca (English)  7.00 cm TL male/unsexed ;9.00 cm female  Restricted to the Lake Zirahuen in Michoacan. Population stable in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Allotoca regalis (Álvarez, 1959) Fr, Thr endemic  Chorumo del Balsas (Spanish)  7.50 cm SL male/unsexed ;8.50 cm female  Known only from Los Reyes, Michoacan. Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Allotoca zacapuensis Meyer, Radda & Domínguez-Domínguez, 2001 Fr, Thr native  Tiro de Zacapu (Spanish)  3.00 cm SL male/unsexed 3.98 SL Known only from Lagoon de Zacapu and Rio Angulo, Zacapu, Michoacán (Ref. 42981). Museum: Lagoon de Zacapu, Zacapu, Michoacán, NMW 94584 (holotype, male, 2.21 cm SL) (Ref. 42981). Also Ref. 84762. Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Alosidae Alosa sapidissima (Wilson, 1811) Fr, Br, M introduced  Sábalo americano (Spanish), Sábalo americano (Spanish)  76.00 cm TL male/unsexed ;61.70 cm SL female  Found in Todos Santos Bay in Baja California (Ref. 6793). Also reported from Bahia de Todos Santos, northern Baja California (Ref. 96339). Also Ref. 6885, 27547. 
Cichlidae Amatitlania nigrofasciata (Günther, 1867) Fr introduced  Convict cichlid (English), Mojarra convicto (Spanish)  10.00 cm SL male/unsexed  Introduced to Río Balsas basin (Ref. 74403). 
Centrarchidae Ambloplites rupestris (Rafinesque, 1817) Fr introduced  Crapet de roche (Spanish)  43.00 cm TL male/unsexed   
Goodeidae Ameca splendens Miller & Fitzsimons, 1971 Fr, Or, Thr endemic  Butterfly splitfin (English), Mexacalpique mariposa (Spanish)  8.00 cm TL male/unsexed ;12.00 cm TL female 3.195 SL Known from Rio Ameca and Rio Teuchitlan in Jalisco. Also Ref. 4537. Status of threat: endangered; status same as 1989. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ameiurus melas (Rafinesque, 1820) Fr, Br native  Black bullhead (English), Bagre torito negro (Spanish), Bagre (Spanish)  66.00 cm TL male/unsexed  Also Ref. 1998. 
Ictaluridae Ameiurus natalis (Lesueur, 1819) Fr introduced  Yellow bullhead (English), Bagre torito amarillo (Spanish)  60.00 cm TL male/unsexed   
Cichlidae Amphilophus istlanus (Jordan & Snyder, 1899) Fr, Fi, Thr endemic  Mojarra del Balsas (Spanish), Redisde cichlid (Spanish), Mojarra (Spanish), Mojarra criolla (Spanish)  30.00 cm TL male/unsexed  Known from the Rio Armeria to the Rio Papagallo. Recorded from the Balsas river basin (Ref. 58351). Also Ref. 12251, 36377. Status of threat: vulnerable. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Amphilophus trimaculatus (Günther, 1867) Fr native  Threespot cichlid (English), Mojarra prieta (Spanish)  36.50 cm SL male/unsexed ;25.00 cm TL female  Found in the Laguna Coyuca. Also Ref. 1739. 
Anablepidae Anableps anableps (Linnaeus, 1758) Fr, Br misidentification   30.00 cm TL male/unsexed  Outside distributional range, probably a misidentification. 
Anablepidae Anableps dowii Gill, 1861 Fr, Br, M native  Northern four-eye (English), Cuatrojos (Spanish)  22.00 cm TL male/unsexed ;34.00 cm TL female  Found in fresh water and full salinity coastal lagoons (Ref. 4537). 
Engraulidae Anchoa curta (Jordan & Gilbert, 1882) Fr, Br, M native  Short anchovy (English), Anchoa chaparra (Spanish), Anchoa corta (Spanish), Anchoa (Spanish)  8.90 cm TL male/unsexed  Ranges from Sinaloa southward (Ref. 9298). Reported from Baja California Sur (Ref. 37955); 25°24'N, 112°06'W (Ref. 96339). 
Engraulidae Anchoa parva (Meek & Hildebrand, 1923) Fr, Br, M native  Little anchovy (English), Anchoa parva (Spanish), Anchoa chiquita (Spanish)  9.10 cm TL male/unsexed   
Engraulidae Anchoa walkeri Baldwin & Chang, 1970 Fr, Br, M native  Persistent anchovy (English), Anchoa persistente (Spanish), Anchoa de Walker (Spanish)  14.50 cm TL male/unsexed  Ranges from the Gulf of California southward (Ref. 9298) to southern tip of Baja California (Ref. 96339). 
Anguillidae Anguilla rostrata (Lesueur, 1817) Fr, Br, M, Fi native  Anguila americana (Spanish)  152 cm TL male/unsexed ;122 cm TL female  Also Ref. 86798, 117426. 
Sciaenidae Aplodinotus grunniens Rafinesque, 1819 Fr native  Freshwater drum (English), Roncador de agau dulce (Spanish) common (usually seen) 95.00 cm TL male/unsexed   
Ariidae Ariopsis assimilis (Günther, 1864) Fr, Br native  Maya sea catfish (English), Bagre maya (Spanish)  35.00 cm TL male/unsexed  Also Ref. 3265. 
Ariidae Ariopsis seemanni (Günther, 1864) Fr, Br, M native  Tete sea catfish (English), Bagre tete (Spanish), Bagre tete (Spanish)  44.40 cm TL male/unsexed   
Cichlidae Astatheros macracanthus (Günther, 1864) Fr native  Blackthroat cichlid (English), Mojarra de Guamuchal (Spanish)  25.00 cm SL male/unsexed  Known from Rio Tehuantepec and Rio Chapala. 
Characidae Astyanax acatlanensis Schmitter-Soto, 2017 Fr native  Acatlán tetra (Spanish), Sardinita de Acatlán (Spanish)  7.49 cm SL male/unsexed  Found only in Río Acatlán in Puebla and Río Jía in Oaxaca (Ref. 118051).  No picture yet.
Characidae Astyanax aeneus (Günther, 1860) Fr native  Banded tetra (English), Penjamo tetra (English), Pepesca (Spanish), Sardinita de Pénjamo (Spanish)  7.50 cm SL male/unsexed ;12.00 cm SL female  Found in Yucatan Peninsula (Ref. 47985). Widespread in southern Mexico (Ref. 47985). Also Ref. 30499. 
Characidae Astyanax altior Hubbs, 1936 Fr, Thr native  Yucatan tetra (English), Sardinita yucateca (Spanish)   Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Characidae Astyanax angustifrons (Regan, 1908) Fr native      No picture yet.
Characidae Astyanax argentatus Baird & Girard, 1854 Fr native  Sardinita tejana (Spanish)  11.43 cm SL male/unsexed  Known from northern Mexico.  No picture yet.
Characidae Astyanax bacalarensis Schmitter-Soto, 2017 Fr native  Bacalar tetra (Spanish), Sardinita de Bacalar (Spanish)  9.48 cm SL male/unsexed  Occurs in Quintana Roo, Caribbean versant of Yucatan Peninsula (Ref. 118583).  No picture yet.
Characidae Astyanax brevimanus (Günther, 1864) Fr native    Known from the highlands of Chiapas (upper tributaries of Río Grijalva) (Ref. 118583).  No picture yet.
Characidae Astyanax caballeroi (Contreras-Balderas & Rivera-Teillery, 1985) Fr, Thr native  Catemaco characin (English), Pepesca de Catemaco (Spanish)  13.80 cm SL male/unsexed  Found in the Catemaco Lake basin (Ref. 38376). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Characidae Astyanax finitimus (Bocourt, 1868) Fr native  Veracruz tetra (English), Sardinita de Veracruz (Spanish)  7.96 cm SL male/unsexed  Known from Gulf coast of Mexico, states of Veracruz, Tabasco, and northern Oaxaca and Chiapas (Ref. 118583).  No picture yet.
Characidae Astyanax jordani (Hubbs & Innes, 1936) Fr, Thr endemic  Sardinita ciega (Spanish), Sardina ciega (Spanish)  10.00 cm TL male/unsexed  Type locality: Subterranean stream in forested mountain region of southeastern San Luis Potosí (occurrence confirmed by Eduardo Perusquia, pers.comm. 01/05). Also Ref. 27297. Status of threat: vulnerable; status same as 1989. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Characidae Astyanax mexicanus (De Filippi, 1853) Fr native  Mexican tetra (English), Sardinita mexicana (Spanish) common (usually seen) 12.00 cm TL male/unsexed  Known from Manantial Baño de San Ignacio, near Linares, San Fernando basin, Nuevo León, Mexico (Ref. 38030). 
Characidae Astyanax ocotal Valdez-Moreno, Rodiles-Hernández & Schmitter-Soto, 2017 Fr native   10.51 cm SL male/unsexed  Known only from Lakes Ocotal and Metzabok, and Río Tulijá in northern Chiapas (Ref. 118583).  No picture yet.
Characidae Astyanax rioverde Lozano-Vilano & Schmitter-Soto, 2017 Fr native  Rioverde tetra (Spanish), Sardinita de Rioverde (Spanish)  7.48 cm SL male/unsexed  Known from ditches and other tributaries (including Río Santa María) to Río Verde, Río Pánuco drainage (Atlantic), near the city of Rioverde, San Luis Potosí State (Ref. 118583).  No picture yet.
Characidae Astyanax salvatoris Valdez-Moreno, Lozano-Vilano & Schmitter-Soto, 2017 Fr endemic  Sardinita del Tamazulapan (Spanish), Tamazulapan tetra (Spanish)  6.10 cm SL male/unsexed  Found only in springs at Tamazulapan, Oaxaca, Balsas drainage, Pacific versant (ref. 118583).  No picture yet.
Characidae Astyanax tamiahua Schmitter-Soto, 2017 Fr native  Sardinita de Tamiahua (Spanish), Tamiahua tetra (Spanish)  6.27 cm SL male/unsexed  Known from Tamiahua to Nautla in northern Veracruz (Ref. 118583).  No picture yet.
Characidae Astyanax tehuacanensis Schmitter-Soto, 2017 Fr native   7.45 cm SL male/unsexed  Found only in Río Salado (Gulf of Mexico versant), south of Tehuacán in Puebla, central Mexico (Ref. 118583).  No picture yet.
Goodeidae Ataeniobius toweri (Meek, 1904) Fr, Or, Thr endemic  Bluetail splitfin (English), Mexcalpique cola azul (Spanish)  7.00 cm TL male/unsexed ;10.00 cm TL female  Found in Ríoverde, San Luis Potosí (Ref. 4537). Status of threat: endangered; status same as 1989. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Atherinopsidae Atherinella alvarezi (Díaz-Pardo, 1972) Fr native  Gulf silverside (English), Plateadito de Tacotalpa (Spanish)  6.60 cm SL male/unsexed  Type locality, Río Tacotalpa, tributary of Rio Grijalva, 40 km south of Villahermosa, Tabasco (Ref. 26282). 
Atherinopsidae Atherinella ammophila Chernoff & Miller, 1984 Fr, Thr native  La Palma silverside (English), Plateadito de la Palma (Spanish)   Type locality, Río de la Palma at La Palma, 8 km north-northwest of Sontecomapan, Veracruz, UMMZ 210808 (Ref. 26282). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Atherinella balsana (Meek, 1902) Fr native  Balsas silverside (English), Plateadito del Balsas (Spanish)   Recorded from the Balsas river basin (Ref. 58351).  No picture yet.
Atherinopsidae Atherinella callida Chernoff, 1986 Fr, Thr native  Cunning silverside (English), Plateadito del Refugio (Spanish)   Type locality, Refugio, Veracruz, LACM 9626-1 (Ref. 26282). Status of threat: possibly extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Atherinella crystallina (Jordan & Culver, 1895) Fr native  Blackfin silverside (English), Plateadito del Presidio (Spanish)   Type locality, Río Presidio, Sinaloa, w. Mexico (Ref. 26282).  No picture yet.
Atherinopsidae Atherinella elegans Chernoff, 1986 Fr native  Fuerte silverside (English), Plateadito del Fuerte (Spanish)   Type locality, Río del Fuerte ca. 1.6 km below San Blas, Sinaloa (Ref. 26282).  No picture yet.
Atherinopsidae Atherinella guatemalensis (Günther, 1864) Fr, Br, M native  Peppered silverside (English), Plateadito de Huamuchal (Spanish), Pejerrey guatemalteco (Spanish)  9.10 cm SL male/unsexed  Ranges from Zacatula southward (Ref. 9273). 
Atherinopsidae Atherinella lisa (Meek, 1904) Fr, Thr native  Naked silverside (English), Plateadito del Hule (Spanish)   Type locality, Refugio, Veracruz, Río Papaloapan basin (Ref. 26282). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Atherinella marvelae (Chernoff & Miller, 1982) Fr, Thr native  Eyipantla silverside (English), Plateadito de Eyipantla (Spanish)   Type locality, Río Bravo just below barrier falls, Salto de Eyipantla, Veracruz (Ref. 26282). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Atherinella pellosemeion Chernoff, 1986 Fr native  Mancuernas silverside (English), Plateadito del Mancuernas (Spanish)   Type locality, Río las Mancuernas 2 km north-northwest of Mecatán on road to San Blas-Tepic highway, Nayarit (Ref. 26282).  No picture yet.
Atherinopsidae Atherinella sallei (Regan, 1903) Fr native  Large-eye silverside (English), Plateadito del Papaloapan (Spanish)   Type locality of Archomenidia bolivari, near Matías Romero, Río Grande or Río Almoloya, Oaxaca, se. Mexico (Ref. 26282).  No picture yet.
Atherinopsidae Atherinella schultzi (Álvarez & Carranza, 1952) Fr, Thr native  Chimalapa silverside (English), Plateadito de Chimalapa (Spanish)   Type locality, Santa María Chimalapa, Arroyo El Zacatal, Oaxaca, se. Mexico (Ref. 26282). Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Lepisosteidae Atractosteus spatula (Lacepède, 1803) Fr, Br, Thr native  Catán (Spanish), Catán (Spanish), Pejelagarto (Spanish)  305 cm OT male/unsexed  Status of threat: vulnerable. Criteria: 1,2 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Lepisosteidae Atractosteus tropicus Gill, 1863 Fr native  Pejelagarto (Spanish), Pejelagarto (Spanish), Catán (Spanish)  125 cm TL male/unsexed   
Gobiidae Awaous banana (Valenciennes, 1837) Fr, Fi native  River goby (English), Gobio de río (Spanish) occasional (usually not seen) 30.00 cm SL male/unsexed ;24.38 cm SL female  Recorded from Baja California Sur, Sonora, Sinaloa, Nayarit, Jalisco, Colima, Michoacan, Guerrero, Morelos, Chiapas, Tamaulipas, San Luis Potosi, Veracruz and Tabasco (Ref. 13444). Found in the Ayuquila River, below the Atlán valley (Ref. 27639). 
Leuciscidae Aztecula sallaei (Günther, 1868) Fr, Thr endemic  Aztec chub (English), Carpita azteca (Spanish), Carpita azteca (Spanish)   Known from the Lerma River basin (Ref. 27639). Also found in Balsas and Pánuco ecoregions (Ref. 81264). Also Ref. 4537, 52299. Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ariidae Bagre pinnimaculatus (Steindachner, 1876) Fr, Br, M native  Long-barbeled sea catfish (English), Bagre barbón (Spanish), Bagre de gavia (Spanish), Bagre rojo (Spanish), Chihuil (Spanish)  95.00 cm TL male/unsexed  Ranges from the Gulf of California southward (Ref. 9271). Also Ref. 26550. 
Sciaenidae Bairdiella chrysoura (Lacepède, 1802) Fr, Br, M native  Silver perch (English), Ronco amarillo (Spanish)  30.00 cm TL male/unsexed 9.3 SL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). 
Gobiidae Bathygobius soporator (Valenciennes, 1837) Fr, Br native  Mapo aguado (Spanish)  15.00 cm TL male/unsexed  Reported in the lower reaches of the Temash river and continental waters. Also recorded from Laguna de Términos (Ref. 79080). Collected at the mouth of the Brazos river on the Gulf of Mexico side of the Quintana Beach, Texas jetty, in October 2009. And since then has been thriving on Macrobrachium shrimp and flake food in my aquarium for 6 months (Brian Hanks - bhanks@blinn.edu, pers.comm. 02/10). 
Batrachoididae Batrachoides goldmani Evermann & Goldsborough, 1902 Fr native  Mexican freshwater toadfish (English), Sapo mexicano (Spanish)  21.60 cm SL male/unsexed  Museum: Tabasco, Río Usumacinta, Montecristo, USNM 50006 (holotype, 216 mm). Tabasco, Río Mescalpa at Huimanguillo, 21 km south of Cárdenas (67.5 mm) (Ref. 30719). 
Batrachoididae Batrachoides waltersi Collette & Russo, 1981 Fr, Br, M native  Multipored toadfish (English), Sapo peludo (Spanish), Sapo de Walter (Spanish)  29.20 cm SL male/unsexed  Ranges from the mouth of the Dulce River southward (Ref. 9277). 
Poeciliidae Belonesox belizanus Kner, 1860 Fr, Br native  Pike killifish (English), Picudito (Spanish) common (usually seen) 20.00 cm TL male/unsexed ;15.00 cm TL female  Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Ref. 79012. 
Poeciliidae Brachyrhaphis hartwegi Rosen & Bailey, 1963 Fr native  Soconusco gambusia (English), Guayacón de Soconusco (Spanish)  3.50 cm TL male/unsexed ;5.00 cm female  Known from Chiapas. Also Ref. 36880. 
Bryconidae Brycon guatemalensis Regan, 1908 Fr native  Macabi tetra (English), Sardinita macabi (Spanish)  59.00 cm TL male/unsexed  Occurs in the Grijalva River (Ref. 6858). 
Eleotridae Caecieleotris morrisi Walsh & Chakrabarty, 2016 Fr native   3.41 cm SL male/unsexed  Known only from a single cave system beneath Presa Miguel Alemán reservoir, northern State of Oaxaca, located along the east side of the Sierra Mazateca front range. The region of the type locality has undergone extensive hydrological modifications and the biologically rich State State of Oaxaca has been experiencing extensive land-use changes over the last few decades. With the current and project land-use situations, it may may be prudent for the Mexican government to consider protective status for Caecieleotris morrisi under the Norma Oficial Mexicana (NOM; SEMARNAT, 2010), pending further exploration and assessement of the population status, distribution, and ecology of this unique species (Ref.109339).  No picture yet.
Leuciscidae Campostoma anomalum (Rafinesque, 1820) Fr native  Central stoneroller (English), Rodapiedras del centro (Spanish) common (usually seen) 22.00 cm TL male/unsexed  Known from Rio San Juan basin (Ref. 86798). Common to abundant throughout much of range (Ref. 86798). Also Ref. 5723. 
Leuciscidae Campostoma ornatum Girard, 1856 Fr, Thr native  Mexican stoneroller (English), Rodapiedras mexicano (Spanish)  16.00 cm TL male/unsexed  Widespread and common in northern Mexico (Ref. 86798). Also Ref. 5723. Status of threat: vulnerable; status same as 1989. Criteria: 1,3,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinidae Carassius auratus (Linnaeus, 1758) Fr introduced  Goldfish (English), Carpa dorada (Spanish), Carpa dorada (Spanish), Pez dorado (Spanish)  48.00 cm TL male/unsexed  Introduced and established in the Lerma River basin (Ref. 27639). 
Carcharhinidae Carcharhinus leucas (Valenciennes, 1839) Fr, Br, M, Fi native  Tiburón toro (Spanish), Sarda (Spanish), Chato (Spanish), Tiburón chato (Spanish), Tiburón toro (Spanish), Toro (Spanish), Xmoa (Spanish)  360 cm TL male/unsexed ;400 cm TL female  Found in southern Baja California (Ref. 96339). Of secondary importance to the Mexican shark fisheries; a very common catch in Tamaulipas, Veracruz, Campeche, Yucatan and Quintana Roo (mostly pre-adults and adults); probably caught in Tabasco (Ref. 13186). Newborn are also common in Quintana Roo catches (Ref. 13186). 
Poeciliidae Carlhubbsia kidderi (Hubbs, 1936) Fr native  Champoton gambusia (English), Guayacón de Champotón (Spanish)  5.00 cm TL male/unsexed ;6.00 cm female  Found in the Rio Champoton in Campeche. 
Catostomidae Carpiodes carpio (Rafinesque, 1820) Fr native  River carpsucker (English), Matalote chato (Spanish) common (usually seen) 64.00 cm TL male/unsexed  Also Ref. 5723, 79012, 86798. 
Catostomidae Carpiodes cyprinus (Lesueur, 1817) Fr, Fi introduced   66.00 cm TL male/unsexed   
Ariidae Cathorops aguadulce (Meek, 1904) Fr native  Estuarine sea catfish (English), Bagre aguadulce (Spanish), Coruco (Spanish), Aguadulce sea catfish (English), Bagre (Spanish)  22.70 cm SL male/unsexed  Type locality: Río Tesechocán at Pérez, Veracruz, Río Papaloapam basin, Mexico, FMNH 4678 (holotype of Galeichthys aguadulce, 22.7 cm SL) (Ref. 75004). Materials examined from the río Usumacinta, formerly considered as Cathorops aguadulce, are treated as Cathorops kailolae by Marceniuk & Betancur-R., 2008 (Ref. 75004).  No picture yet.
Ariidae Cathorops fuerthii (Steindachner, 1876) Fr, Br, M native  Congo sea catfish (English), Bagre aguadulce (Spanish), Bagre congo (Spanish)  31.20 cm TL male/unsexed   
Ariidae Cathorops kailolae Marceniuk & Betancur-R., 2008 Fr native  Papillate sea catfish (English), Bagre papilosa (Spanish)  25.40 cm SL male/unsexed  Known from the rio Usumacinta basin (Ref. 75004). 
Ariidae Cathorops liropus (Bristol, 1897) Fr native  Conguito sea catfish (English), Bagre conguito (Spanish)  19.70 cm SL male/unsexed  Recorded from puente de Chacalilla on estero de San Blain, Nayarit and from río Sonora, lago San Juan (Ref. 75004). 
Ariidae Cathorops raredonae Marceniuk, Betancur-R. & Acero P., 2009 Fr, Br, M native  Curator sea catfish (English), Bagre curadora (Spanish)     No picture yet.
Catostomidae Catostomus bernardini Girard, 1856 Fr, Thr native  Yaqui sucker (English), Matalote yaqui (Spanish) common (usually seen) 40.00 cm TL male/unsexed  Status of threat: vulnerable; status same as 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Catostomus cahita Siebert & Minckley, 1986 Fr, Thr native  Cahita sucker (English), Matalote cahita (Spanish), Matalote cahita (Spanish)   Status of threat: threatened; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Catostomus clarkii Baird & Girard, 1854 Fr native  Desert sucker (English), Matalote del desierto (Spanish) common (usually seen) 33.00 cm TL male/unsexed   
Catostomidae Catostomus conchos Meek, 1902 Fr native  Matalote conchos (Spanish)     No picture yet.
Catostomidae Catostomus insignis Baird & Girard, 1854 Fr native  Sonora sucker (English), Matalote de Sonora (Spanish)  80.00 cm TL male/unsexed   
Catostomidae Catostomus leopoldi Siebert & Minckley, 1986 Fr, Thr native  Fleshylip sucker (English), Matalote del Bavispe (Spanish), Matalote del Bavispe (Spanish)   Known from the Rio de Bavispe system in northwestern Mexico (Ref. 4537). Status of threat: threatened; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Catostomus nebuliferus Garman, 1881 Fr, Thr native  Nazas sucker (English), Matalote del Nazas (Spanish)   Type locality, Río Nazas, Coahuila (Ref. 50838). Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Catostomidae Catostomus plebeius Baird & Girard, 1854 Fr, Thr native  Rio Grande sucker (English), Matalote del Bravo (Spanish) common (usually seen) 20.00 cm TL male/unsexed  Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Catostomus wigginsi Herre & Brock, 1936 Fr, Thr endemic  Opata sucker (English), Matalote ópata (Spanish), Matalote opata (Spanish)   Status of threat: threatened; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Centropomidae Centropomus ensiferus Poey, 1860 Fr, Br, M native  Robalo de espolón (Spanish)  36.20 cm TL male/unsexed   
Centropomidae Centropomus nigrescens Günther, 1864 Fr, Br, M native  Robalo negro (Spanish), Róbalo prieto (Spanish), Robalo prieto (Spanish)  123 cm TL male/unsexed  Ranges from southern Baja California and Gulf of California southward (Ref. 9284). Also Ref. 4537, 26550. 
Centropomidae Centropomus parallelus Poey, 1860 Fr, Br, M native  Chucumite (Spanish), Robalo chucumite (Spanish)  72.00 cm TL male/unsexed  Recorded from Laguna de Términos (Ref. 79080). 
Centropomidae Centropomus pectinatus Poey, 1860 Fr, Br, M native  Constantino (Spanish), Constantino (Spanish), Robalo constantino (Spanish)  56.00 cm TL male/unsexed  Also Ref. 26340, 50313. 
Centropomidae Centropomus undecimalis (Bloch, 1792) Fr, Br, M, Fi, Aq, Rstr native  Common snook (English), Robalo blanco (Spanish), Robalo blanco (Spanish)  140 cm TL male/unsexed  Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Regulations: catch season: 16 Nov.-30 Jun.; closed season: 1Jul.-15 Aug.; marketed fresh (whole, fillet) or frozen (Ref. 26550). 
Goodeidae Chapalichthys encaustus (Jordan & Snyder, 1899) Fr, Thr endemic  Barred splitfin (English), Pintito de Ocotlán (Spanish)  6.00 cm TL male/unsexed ;8.00 cm TL female  Found in Laguna de Chapala. Population stable in the 1990s (Ref. 27639). Status of threat: vulnerable. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Chapalichthys pardalis Álvarez, 1963 Fr, Thr endemic  Polka-dot splitfin (English), Pintito de Tocumbo (Spanish)  6.00 cm TL male/unsexed ;7.00 cm TL female  Found in Michoacán (Ref. 4537). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Chapalichthys peraticus Álvarez, 1963 Fr, Thr endemic  Alien splitfin (English), Pintito de San Juanico (Spanish)  5.00 cm TL male/unsexed ;6.50 cm female  Known from San Juanico, Cotija, Michoacan. Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Characodon audax Smith & Miller, 1986 Fr, Thr endemic  Bold characodon (English), Mexcalpique del Toboso (Spanish)   Found in Durango (Ref. 3881). Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Characodon garmani Jordan & Evermann, 1898 Fr, Thr endemic  Parras characodon (English), Mexcalpique de Parras (Spanish), Parras Characodon (Spanish)   Formerly found in the Parras Valley and it is now extinct (Ref. 32716). Also Ref. 3881. Status of threat: extinct. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Characodon lateralis Günther, 1866 Fr, Thr endemic  Rainbow characodon (English), Mexcalpique arcoiris (Spanish)  4.00 cm TL male/unsexed ;5.50 cm TL female  Known from Los Berros near El Salto and Ojo de Aqua de San Juan in Durango. Found in Mezquital River, Durango (Ref. 3881). Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Chiapaheros grammodes (Taylor & Miller, 1980) Fr, Thr native  Chiapa de Corzo cichlid (Spanish), Mojarra del Chiapa de Corzo (Spanish)  20.30 cm SL male/unsexed  Found in the Grijalva River basin from the Rio Grande de Chiapa drainage (Ref. 36377). Also Ref. 7335. Status of threat: vulnerable. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Atherinopsidae Chirostoma aculeatum Barbour, 1973 Fr, Thr endemic  Scowling silverside (English), Charal cuchillo (Spanish)   Type locality: South shore of Lake Yuriria, ca. 1.5 mi. east of Yuriria, Guanajuato. Range contracting (Ref. 27639). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma arge (Jordan & Snyder, 1899) Fr, Thr endemic  Largetooth silverside (English), Charal del Verde (Spanish)  11.20 cm TL male/unsexed  Endemic to the Lerma River basin. Type locality: Río Verde near Aguascalientes. Range contracting (Ref. 27639). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma attenuatum Meek, 1902 Fr endemic  Slender silverside (English), Charal prieto (Spanish), Charal (Spanish)  10.00 cm TL male/unsexed  Population questionably stable (Ref. 27639).  No picture yet.
Atherinopsidae Chirostoma bartoni Jordan & Evermann, 1896 Fr, Thr endemic  Alberca silverside (English), Charal de la Caldera (Spanish), Charal (Spanish), Charal de la Caldera (Spanish)  7.10 cm SL male/unsexed  Endemic to Lerma River basin. Abundance declining (Ref. 27639). Also Ref. 3881. Status of threat: possibly extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma chapalae Jordan & Snyder, 1899 Fr, Fi, Rstr endemic  Smallmouth silverside (English), Charal de Chapala (Spanish), Charal (Spanish), Silverside (English)  14.00 cm TL male/unsexed  Catch season: 1 May - 28 Feb.; closed season: 1 Mar. - 30 Apr.; marketed fresh, dried-salted, or dried-chili and breaded (Ref. 26550). Population questionably stable (Ref. 27639).  No picture yet.
Atherinopsidae Chirostoma charari (de Buen, 1945) Fr, Thr endemic  Least silverside (English), Charal tarasco (Spanish)   Endemic to the Lerma River basin. Endangered or extinct (Ref. 27639). Type locality: Río Grande de Morelia and Lake Cuitzeo valley. Status of threat: possibly extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma compressum de Buen, 1940 Fr endemic  Pescado blanco (Spanish)   Endemic to the Lerma River basin. Endangered or extinct (Ref. 27639).  No picture yet.
Atherinopsidae Chirostoma consocium Jordan & Hubbs, 1919 Fr native  Ranch silverside (English), Charal de rancho (Spanish)  10.90 cm TL male/unsexed  Type locality: Lake Chapala at La Palma, Michoacan. Population stable in the Lerma River basin (Ref. 27639).  No picture yet.
Atherinopsidae Chirostoma contrerasi Barbour, 2002 Fr, Thr native  Ajijic silverside (English), Charal de Ajijic (Spanish)  11.30 cm TL male/unsexed  Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma copandaro de Buen, 1945 Fr native  Pescado blanco (Spanish), Blanco de Zirahuén (Spanish)     No picture yet.
Atherinopsidae Chirostoma estor Jordan, 1880 Fr, Fi, Thr endemic  Pike silverside (English), Pescado blanco (Spanish), Pescado blanco (Spanish), Silverside (English), Whitefish (English)  42.00 cm TL male/unsexed  Endemic to Jalisco and Michoacan states; marketed fresh (whole, gutted), frozen, or dried-salted (Ref. 26550). Population questionably stable (Ref. 27639). Status of threat: vulnerable. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma grandocule (Steindachner, 1894) Fr, Thr endemic  Bigeye silverside (English), Charal de lago (Spanish), Charal (Spanish)  12.30 cm SL male/unsexed 7.55 FL Endemic to the Lerma River basin. Range contracting (Ref. 27639). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma humboldtianum (Valenciennes, 1835) Fr, Thr native  Shortfin silverside (English), Charal de Xochimilco (Spanish), Pescado blanco (Spanish)  20.00 cm TL male/unsexed  Population questionably stable in the 1990s (Ref. 27639). Also Ref. 84762. Status of threat: vulnerable. Criteria: 1,2,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma jordani Woolman, 1894 Fr, Br native  Mesa silverside (English), Mezquital silverside (English), Charal (Spanish), Charal del Mezquital (Spanish), Charal (Spanish)  11.10 cm TL male/unsexed  Population questionably stable in the Lerma River basin in the 1990s (Ref. 27639). Also recorded from Rio del Tunal, near Durango City, Durango (Ref. 27116).  No picture yet.
Atherinopsidae Chirostoma labarcae Meek, 1902 Fr, Thr endemic  Sharpnose silverside (English), Charal de La Barca (Spanish), Charal (Spanish)  10.80 cm male/unsexed  Endemic to the Lerma River basin, range contracting in the 1990s (Ref. 27639). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma lucius Boulenger, 1900 Fr, Thr endemic  Longjaw silverside (English), Charal de la Laguna (Spanish), Pescado blanco (Spanish)   Endemic to the Lerma River basin. Abundance declining in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma melanoccus Álvarez, 1963 Fr, Thr native  Blunthead silverside (English), Charal de San Juanico (Spanish)   Type locality, Presa San Juanico, near Cotija, Michoacan, Mexico. (Ref. 26282). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma patzcuaro Meek, 1902 Fr, Thr endemic  Patzcuaro silverside (English), Charal pinto (Spanish)  12.00 cm TL male/unsexed  Endemic to the Lerma River basin. Population questionably stable in the 1990s (Ref. 27639). Status of threat: threatened. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma promelas Jordan & Snyder, 1899 Fr, Thr endemic  Blacknose silverside (English), Charal boca negra (Spanish)   Endemic to the Lerma River basin, abundance declining in the 1990s, considered threatened (Ref. 27639). Status of threat: endangered. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma reseratum Álvarez, 1963 Fr native      No picture yet.
Atherinopsidae Chirostoma riojai Solórzano & López, 1966 Fr, Thr endemic  Toluca silverside (English), Charal de Santiago (Spanish)   Type locality: Laguna de Santiago Tilapa. Population questionable stable in the Lerma River basin in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma sphyraena Boulenger, 1900 Fr, Rstr, Thr endemic  Bigmouth silverside (English), Charal barracuda (Spanish), Pescado blanco (Spanish), Silverside (English), Whitefish (English)   Restrictions for Chapale Lake in Jalisco: catch season: 1 Apr. - 31 Jan.; closed season: 1 Feb. - 31 Mar. Abundance declining in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Chirostoma zirahuen Meek, 1902 Fr native    Type locality: Zirahuén Lake at Zirahuén, Michoacan, Mexico (Ref. 33021).  No picture yet.
Cichlidae Chuco intermedium (Günther, 1862) Fr native  Peten cichlid (English), Mojarra del Petén (Spanish)  20.00 cm SL male/unsexed  Known from the upper reaches of the Rio Usumacinta basin in the Rio Tulija and Rio Mi-sol-Ha in Chiapas (Ref. 7335). Also found in the Grijalva drainage (Ref. 36377). 
Cichlidae Cichlasoma geddesi (Regan, 1905) Fr endemic   6.50 cm TL male/unsexed  Type locality: Southern Mexico.  No picture yet.
Cichlidae Cincelichthys pearsei (Hubbs, 1936) Fr native  Pantano cichlid (English), Mojarra zacatera (Spanish), Zacatera (Spanish)  20.00 cm SL male/unsexed  Found in the Rio Tulija. 
Cyclopsettidae Citharichthys gilberti Jenkins & Evermann, 1889 Fr, Br, M native  Bigmouth sanddab (English), Lenguado tapadera (Spanish), Lenguado tapadero (Spanish)  27.90 cm TL male/unsexed   
Cyclopsettidae Citharichthys uhleri Jordan, 1889 Fr native  Voodoo whiff (English), Lenguado albimoteado (Spanish)  14.00 cm SL male/unsexed   
Leuciscidae Codoma ornata Girard, 1856 Fr, Thr native  Ornate shiner (English), Carpita adornada (Spanish)   Known from the Mayrán-Viesca and Río Conchos drainages (Ref. 81264). Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Coptodon rendalli (Boulenger, 1897) Fr, Fi, Aq introduced  Mojarrita (Spanish), Mojarra Mojarra (Spanish), Tilapia (Spanish) common (usually seen) 45.00 cm TL male/unsexed  Year round fishing; marketed fresh (whole, gutted, fillet) (Ref. 26550). 
Cichlidae Coptodon zillii (Gervais, 1848) Fr, Br introduced  Mojarra (Spanish), Mojarrita (Spanish), Tilapia (Spanish)  40.00 cm SL male/unsexed  Recorded from Laguna de Términos (Ref. 79080). 
Cichlidae Cribroheros robertsoni (Regan, 1905) Fr native  Honduras cichlid (English), Mojarra hondureña (Spanish), Tepemechine (Not specified), Emerald cichlid (English)  19.00 cm SL male/unsexed  Known from the Rio Papaloapan basin, Lago Tamascal. Widespread throughout the Rio Usumacinta basin. 
Cichlidae Cryptoheros chetumalensis Schmitter-Soto, 2007 Fr native   9.70 cm SL male/unsexed  Type locality, Arroyo Aguadulce, a tributary of the Río Hondo, at Sabidos, near Chetumal, Quintana Roo, ECOCH 5467 (holotype of Cryptoheros chetumalensis, 6.3 cm SL). Known from Guatemalan Petén (Río Sarstún), to as far north as Laguna Kaná, 19°30’N (Ref. 74403). 
Cichlidae Cryptoheros spilurus (Günther, 1862) Fr misidentification  Blue-eye cichlid (English), Mojarra yucateca (Spanish)  12.00 cm TL male/unsexed ;8.00 cm TL female  Occurs in Campeche (Ref. 4537). Occurrence of this species in the country is not confirmed (Ref. 36377). 
Gobiidae Ctenogobius claytonii (Meek, 1902) Fr native  Mexican goby (English), Gobio mexicano (Spanish)  5.80 cm SL male/unsexed  Also Ref. 26938, 52299.  No picture yet.
Xenocyprididae Ctenopharyngodon idella (Valenciennes, 1844) Fr introduced  Grass carp (English), Carpa herbívora (Spanish), Carpa herbivora (Spanish)  150 cm TL male/unsexed  Recorded from the Balsas river basin (Ref. 58351). Also Ref. 1739, 84762. 
Cyprinodontidae Cualac tessellatus Miller, 1956 Fr, Fi, Or, Thr endemic  Media Luna pupfish (English), Cachorrito de la Media Luna (Spanish), Cachorrito de Media Luna (Spanish)  8.00 cm TL male/unsexed  Found in San Luis Potosi (Ref. 27139). Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Cycleptus elongatus (Lesueur, 1817) Fr native  Matalote azul (Spanish)  93.00 cm TL male/unsexed   
Rivulidae Cynodonichthys hendrichsi (Álvarez & Carranza, 1952) Fr native    Found in Salto de Agua, Chiapas (Ref. 36579). 
Rivulidae Cynodonichthys myersi (Hubbs, 1936) Fr, Br native    Found in slightly brackish pool 3 km south of Progreso, Yucatán (Ref. 36579).  No picture yet.
Rivulidae Cynodonichthys tenuis Meek, 1904 Fr native  Maya rivulus (English), Almirante del Hule (Spanish)  6.50 cm TL male/unsexed   
Leuciscidae Cyprinella alvarezdelvillari Contreras-Balderas & Lozano-Vilano, 1994 Fr, Thr endemic  Tepehuan shiner (English), Carpita tepehuana (Spanish), Sardinita bronze del Nazas (Spanish)  4.38 cm SL male/unsexed  Status of threat: endangered; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Cyprinella bocagrande (Chernoff & Miller, 1982) Fr, Thr endemic  Largemouth shiner (English), Carpita bocagrande (Spanish), Sardinita bocagrande (Spanish), Largemouth shiner (English)  4.07 cm SL male/unsexed  Known only from a single spring in the Guzman basin. The only known locality is Ojo Solo and a nearby drainage ditch, approximately 39 km west of Villa Ahumada, Chihuahua. Also Ref. 6376. Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Cyprinella formosa (Girard, 1856) Fr, Thr native  Beautiful shiner (English), Carpita yaqui (Spanish), Sardinita de Santa Maria (Spanish) occasional (usually not seen) 9.00 cm TL male/unsexed  Common throughout most of its range in the Guzmán Río Yaqui, Bavícora and Sauz basins (Ref. 42680). Also Ref. 3881, 5723, 86798. Status of threat: threatened; status declined since 1989 listing. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Cyprinella garmani (Jordan, 1885) Fr, Thr native  Gibbous shiner (English), Carpita jorobada (Spanish)   Known from Mayrán-Viesca (Ref. 81264). Type locality: Lago del Muerto, near Parras, Coahuila (Ref. 33021). Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Cyprinella lutrensis (Baird & Girard, 1853) Fr native  Carpita roja (Spanish) abundant (always seen in some numbers) 9.30 cm TL male/unsexed  Found in northern Mexico (Ref. 86798). Also Ref. 5723. 
Leuciscidae Cyprinella panarcys (Hubbs & Miller, 1978) Fr, Thr endemic  Conchos shiner (English), Carpita del Conchos (Spanish)   Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Cyprinella proserpina (Girard, 1856) Fr native  Proserpine shiner (English), Carpita río del norte (Spanish)  7.50 cm TL male/unsexed  Occurs in Rio San Carlo (Rio Grande drainage), Coahuila (Ref. 86798). Also Ref. 3881, 5723. 
Leuciscidae Cyprinella rutila (Girard, 1856) Fr, Thr endemic  Mexican red shiner (English), Carpita regiomontana (Spanish)   Known from Río Salado and Río San Juan (Ref. 81264). Type locality: Río Monterrey (tributary to Río San Juan), Cadereita [Cadereyta], Nuevo León (Ref. 33021). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Cyprinella xanthicara (Minckley & Lytle, 1969) Fr, Thr endemic  Cuatro Cienegas shiner (English), Carpita de Cuatro Ciénegas (Spanish), Cuatro Cienegas Shiner (Spanish)   Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon albivelis Minckley & Miller, 2002 Fr, Thr native  Whitefin pupfish (English), Cachorrito aletas blancas (Spanish), Cachorrito aletas blancas (Spanish), Whitefin pupfish (English)  5.31 cm SL male/unsexed ;4.07 cm SL female  Known from the upper Río Papigóchic subbasin of the Pacific slope, Río Yaqui drainage and from a single, low-elevation (1430 m) spring complex, Ojo de Arrey, in the Río Santa María drainage (interior Lago de Guzmán Basin) (Ref. 43452). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon alvarezi Miller, 1976 Fr, Fi, Thr endemic  Potosi pupfish (English), Cachorrito de Potosí (Spanish), Perrito de Potosi (Spanish)  5.00 cm TL male/unsexed  Found in El Potosí, Nuevo Leon (Ref. 27139). Known from Río San Juan (Ref. 81264). Also Ref. 3881. Status of threat: extirpated in nature; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon artifrons Hubbs, 1936 Fr, Br, M native  Bolín petota (Spanish)  6.00 cm TL male/unsexed 2.4 SL Found in Progreso (Ref. 30499) and Celestún Biosphere Reserve, Yucatan (Ref. 74908).  No picture yet.
Cyprinodontidae Cyprinodon atrorus Miller, 1968 Fr, Fi, Thr endemic  Bolson pupfish (English), Cachorrito del bolsón (Spanish), Perrito del Bolson (Spanish)  4.00 cm TL male/unsexed  Known from Río Salado and Cuatro Ciénegas systems (Ref. 81264). Also Ref. 3881. Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon beltrani Álvarez, 1949 Fr, Thr endemic  Blackfin pupfish (English), Cachorrito lodero (Spanish), Cachorrito lodero (Spanish)  5.00 cm TL male/unsexed  Known from the Yucatán-Quintana Roo system (Ref. 81264). Found in the Laguna Chichancanab (Ref. 50471). Also Ref. 3881, 6376, 27139. Status of threat: vulnerable; status improved since 1989 listing. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon bifasciatus Miller, 1968 Fr, Thr endemic  Cuatro Cienegas pupfish (English), Cachorrito de Cuatro Ciénegas (Spanish), Perrito de Cuatro Cienegas (Spanish)  6.00 cm TL male/unsexed  Known from the Cuatro Ciénegas system (Ref. 81264). Reported from Yucatan (Ref. 27139). Also Ref. 3881, 6376. Status of threat: endangered; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon bobmilleri Lozano-Vilano & Contreras-Balderas, 1999 Fr, Br, Thr endemic  San Ignacio pupfish (English), Cachorrito de San Ignacio (Spanish)  3.48 cm SL male/unsexed ;3.34 cm SL female  Known from the lower Río Grande, Río Bravo del Norte (Ref. 81264). Type locality: Manantial Baño de San Ignacio, near Linares, San Fernando basin, Nuevo León, Mexico (Ref. 38030). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon ceciliae Lozano-Vilano & Contreras-Balderas, 1993 Fr, Thr endemic  Villa Lopez pupfish (English), Cachorrito de Villa López (Spanish)  7.00 cm TL male/unsexed  Known from the Río San Juan system (Ref. 81264). Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon esconditus Strecker, 2002 Fr, Thr native  Hidden pupfish (English), Cachorrito escondido (Spanish)  3.90 cm SL male/unsexed  Known from the Yucatán-Quintana Roo system (Ref. 81264). Found in the Laguna Chichancanab (Ref. 50471). Type locality, Southern end of Laguna Chichancanab at its broadest part, 19°51'10"N, 88°45'58"W, Yucatan Peninsula, Quintana Roo (Ref. 46206). Status of threat: endangered. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon eximius Girard, 1859 Fr, Thr native  Conchos pupfish (English), Cachorrito del Conchos (Spanish) common (usually seen) 5.00 cm TL male/unsexed  Found in Chihuahua (Ref. 27139). Known from the Río Conchos ecoregion (Ref. 81264). Status of threat: threatened. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon fontinalis Smith & Miller, 1980 Fr, Thr endemic  Carbonera pupfish (English), Cachorrito de Carbonera (Spanish), Perrito de Carbonera (Spanish)  6.00 cm TL male/unsexed  Found in Chihuahua (Ref. 27139). Also Ref. 3881, 6376. Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon inmemoriam Lozano-Vilano & Contreras-Balderas, 1993 Fr, Thr extirpated  Charco Azul pupfish (English), Cachorrito de Charco Azul (Spanish)  7.50 cm TL male/unsexed  Known from the Río San Juan system (Ref. 81264). Type locality, interior basin of Llanos de Salas, Aramberri, Nuevo Leon, Ojo la Trinidad, UANL 8291 (holotype of Cyprinodon veronicae, 4.42 cm SL, mature male). The type locality, Ojo La Trinidad was in Bolsón de Sandia, about 1600 m above sea level, near the piedmont of Sierra Montelongo Pedregoso, and at the middle eastern edge of Pluvial Lake Sandia. The area is semiarid, with scattered Acacia and common succulents (Ref. 26729). Status of threat: Extinct (Contreras-Balderas & Lozano-Vilano 1996:34) (Ref. 22301, 27139). Recent assessment: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon julimes De la Maza-Benignos & Vela-Valladares, 2009 Fr, Thr native    Status of threat: endangered (Ref. 84738). 
Cyprinodontidae Cyprinodon labiosus Humphries & Miller, 1981 Fr, Thr endemic  Thicklip pupfish (English), Cachorrito cangrejero (Spanish), Cachorrito cangrejero (Spanish)  7.00 cm TL male/unsexed  Known from the Yucatán-Quintana Roo system (Ref. 81264). Also Ref. 3881, 6376, 27139. Status of threat: endangered; status declined since 1989. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon latifasciatus Garman, 1881 Fr, Thr endemic  Parras pupfish (English), Cachorrito de Parras (Spanish), Perrito de Parras (Spanish)  5.50 cm TL male/unsexed  Found in the Mayrán-Viesca system (Ref. 81264). Formerly found in a spring near Parras in Coahuila (Ref. 3881, 27139). Also Ref. 32716. Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon longidorsalis Lozano-Vilano & Contreras-Balderas, 1993 Fr, Thr endemic  La Palma pupfish (English), Cachorrito de La Palma (Spanish)  5.14 cm SL male/unsexed  Known from the Río San Juan system (Ref. 81264). Type locality, interior basin of Llanos de Salas, Aramberri, Nuevo Leon, Charco de Palma, UANL 8281(holotype of Cyprinodon longidorsalis, 4.06 cm SL, mature male) (Ref. 26729). Considered as endangered (Lozano and Contreras, 1989) and species of special concern (Williams et al., 1989) (Ref. 26729). Also Ref. 12255, 27139. Status of threat: extirpated in nature. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon macrolepis Miller, 1976 Fr, Thr endemic  Bigscale pupfish (English), Cachorrito escamudo (Spanish)  5.00 cm TL male/unsexed  Found in Chihuahua (Ref. 27139). Known from the Río Conchos system (Ref. 81264). Also Ref. 3881, 6376. Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon macularius Baird & Girard, 1853 Fr, Thr native  Desert pupfish (English), Cachorrito del desierto (Spanish) occasional (usually not seen) 5.00 cm TL male/unsexed  Only for subspecies C. m. macularius if recognized (Ref. 27139). Status of threat: endangered; status same as 1989. Criteria: 1,3,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon maya Humphries & Miller, 1981 Fr, Thr endemic  Maya pupfish (English), Cachorrito gigante (Spanish), Cachorrito gigante (Spanish)  10.00 cm TL male/unsexed  Known from the Yucatán-Quintana Roo system (Ref. 81264). Also Ref. Ref. 3881, 6376. Status of threat: endangered; status declined since 1989. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon meeki Miller, 1976 Fr, Thr endemic  Mezquital pupfish (English), Cachorrito del Mezquital (Spanish), Cachorrito de Mezquital (Spanish)  5.00 cm TL male/unsexed  Known from the Santiago system (Ref. 81264). Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon nazas Miller, 1976 Fr, Thr endemic  Nazas pupfish (English), Cachorrito del Nazas (Spanish), Cachorrito del Aguanaval (Spanish)  5.00 cm TL male/unsexed  Found in Coahuila (Ref. 27139). Known from the Mayrán-Viesca system (Ref. 81264). Also Ref. 3881, 6376. Status of threat: threatened; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon pachycephalus Minckley & Minckley, 1986 Fr, Thr endemic  Bighead pupfish (English), Cachorrito cabezón (Spanish), Cachorrito cabezon (Spanish)  5.00 cm TL male/unsexed  Found in Chihuahua (Ref. 27139). Known from the Río Conchos system (Ref. 81264). Also Ref. 3881, 6376. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon pisteri Miller & Minckley, 2002 Fr, Thr native  Palomas pupfish (English), Cachorrito de Palomas (Spanish), Cachorrito de Guzmán (Spanish), Guzman pupfish (English)  4.90 cm SL male/unsexed ;4.93 cm female  Known from a variety of systems and habitats in the Lago de Guzmán complec basin in N Chihuahua (Ref. 43452). Status of threat: endangered; status same as 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon salvadori Lozano-Vilano, 2002 Fr, Thr native  Bocochi pupfish (English), Cachorrito de Bocochi (Spanish)   Known from the Guzmán-Samalayuca system (Ref. 81264). Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon simus Humphries & Miller, 1981 Fr, Thr endemic  Boxer pupfish (English), Cachorrito boxeador (Spanish), Cachorrito boxeador (Spanish)  4.50 cm TL male/unsexed  Found in Yucatan (Ref. 27139). Known from the Yucatán-Quintana Roo system (Ref. 81264). Also Ref. 3881, 6376. Status of threat: endangered; status declined since 1989. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinodontidae Cyprinodon suavium Strecker, 2005 Fr, Thr native  Cachoritto besucón (Spanish)  4.55 cm SL male/unsexed  Found only in the Laguna Chichancanab in Yucatan (Ref. 55026). Status of threat: endangered. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon variegatus Lacepède, 1803 Fr, Br, M native  Sheepshead minnow (English), Bolín (Spanish) common (usually seen) 9.00 cm TL male/unsexed  Common; locally abundant.  
Cyprinodontidae Cyprinodon verecundus Humphries, 1984 Fr, Thr endemic  Largefin pupfish (English), Cachorrito aletón (Spanish), Cachorrito de dorsal larga (Spanish)  4.00 cm TL male/unsexed  Known from the Yucatán-Quintana Roo esystem (Ref. 81264). Also Ref. 3881, 27139. Status of threat: endangered; status declined since 1989. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Cyprinodon veronicae Lozano-Vilano & Contreras-Balderas, 1993 Fr, Thr endemic  Charco Palma pupfish (English), Cachorrito de Charco Palma (Spanish)  5.50 cm TL male/unsexed  Known from Cachorrito de Charco Azul (12255) and Nuevo Leon (Ref. 27139). Found in the Río San Juan system (Ref. 81264). Type locality, interior basin of Llanos de Salas, Aramberri, Nuevo León, Ojo de Agua Charco Azul (= Barreno), UANL 8291 (holotype of Cyprinodon veronicae, 4.42 cm SL, mature male) (Ref. 26729). Status of threat: extirpated in nature. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cyprinidae Cyprinus carpio Linnaeus, 1758 Fr, Fi, Aq introduced  Common carp (English), Carpa comun (Spanish), Carpa común (Spanish), Carpa barrigona (Spanish), Carpa espejo (Spanish)  120 cm TL male/unsexed  Year round fishing; marketed fresh (whole, fillet), frozen fillet, or cooked whole (Ref. 26550). Introduced and established in the Lerma River basin. Parasitized by Bothriocephalus acheilognathi which was introduced into the country with carp which has become widely disseminated in the country and has been found in at least 15 fish species (Ref. 48731). Recorded from the Balsas river basin (Ref. 58351). Also Ref. 84762. 
Mugilidae Dajaus monticola (Bancroft, 1834) Fr, Br, Fi native  Mountain mullet (English), Trucha de tierra caliente (Spanish), Lisa de rio (Spanish)  36.00 cm TL male/unsexed  Recorded from the Balsas river basin (Ref. 58351). 
Leuciscidae Dionda diaboli Hubbs & Brown, 1957 Fr native  Devils River minnow (English), Carpa diabla (Spanish)  6.40 cm TL male/unsexed  Occurs in northern Mexico (Ref. 86798). 
Leuciscidae Dionda episcopa Girard, 1856 Fr native  Roundnose minnow (English), Carpa manchada (Spanish) scarce (very unlikely) 7.70 cm TL male/unsexed  Also Ref. 5723. 
Leuciscidae Dionda melanops Girard, 1856 Fr native  Spotted minnow (English), Carpa manchada (Spanish)   Type locality, Buena Vista [La Joya del Refugio], Coahuila, Mexico (Ref. 50838). 
Eleotridae Dormitator latifrons (Richardson, 1844) Fr, Br, M native  Pacific fat sleeper (English), Puyeki (Spanish), Guavina (Spanish)  41.00 cm TL male/unsexed ;39.00 cm TL female  Also Ref. 50313. 
Dorosomatidae Dorosoma anale Meek, 1904 Fr, Br native  Longfin gizzard shad (English), Sardina del Papaloapan (Spanish)  23.60 cm SL male/unsexed  Known from the Papaloapán River basin (Ref. 58459). Also recorded from Laguna de Términos (Ref. 79080). 
Dorosomatidae Dorosoma cepedianum (Lesueur, 1818) Fr, Br, M native  Gizzard shad (English), Sardina molleja (Spanish)  57.00 cm FL male/unsexed  Also Ref. 79012, 27549, 93252. 
Dorosomatidae Dorosoma petenense (Günther, 1867) Fr, Br, M native  Threadfin shad (English), Sardina maya (Spanish), Sábalo de hilo (Spanish)  33.00 cm TL male/unsexed  Recorded from Laguna de Términos (Ref. 79080). 
Dorosomatidae Dorosoma smithi Hubbs & Miller, 1941 Fr native  Pacific gizzard shad (English), Sardina norteña (Spanish)  14.00 cm SL male/unsexed   
Eleotridae Eleotris pisonis (Gmelin, 1789) Fr native   25.00 cm TL male/unsexed   
Petromyzontidae Entosphenus tridentatus (Richardson, 1836) Fr, Br, M native  Pacific lamprey (English), Lamprea del Pacifico (Spanish), Lamprea del Pacifico (Spanish)  76.00 cm TL male/unsexed  Off Clarión Island, Revillagigedo Archipelago and Baja California (Ref. 89241). Ranges south to Punta Canoas, central Baja California (Ref. 27436). Also Ref. 559, 5723, 6885, 96339, 43939. 
Percidae Etheostoma australe Jordan, 1889 Fr, Thr endemic  Conchos darter (English), Perca del Conchos (Spanish), Dardo de Conchos (Spanish)  5.50 cm TL male/unsexed  Known from the Conchos River system in northern Mexico (Ref. 4537). Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Percidae Etheostoma grahami (Girard, 1859) Fr, Thr native  Perca del Bravo (Spanish)  6.00 cm TL male/unsexed  Status of threat: threatened; status declined since 1989. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Percidae Etheostoma lugoi Norris & Minckley, 1997 Fr, Thr native  Pesca de toba (Spanish), Perca de toba (Spanish), Tufa darter (English)  3.51 cm SL male/unsexed ;3.76 cm SL female  Known only from Bolsón de Cuatro Ciénegas where it is restricted to Rio Mesquites and its tributaries, most ntably Rio Puente Chiquito (Ref. 26684). Status of threat: endangered; status same as 1989. Criteria: 1,3,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Percidae Etheostoma pottsii (Girard, 1859) Fr, Thr native  Mexican darter (English), Perca mexicana (Spanish)  5.50 cm TL male/unsexed  Known from Sinaloan coastal, Mayrán-Viesca, and Río Conchos ecoregions (Ref. 81264). Status of threat: threatened; status same as 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Percidae Etheostoma segrex Norris & Minckley, 1997 Fr, Thr native  Salado darter (English), Perca del Salado (Spanish), Perca del Salado (Spanish), Río Salado darter (English)  4.11 cm SL male/unsexed ;4.38 cm SL female  Found in the upper Rio Salado de los Nadadores, a stream formed by the outflow of the Bolson de Cuatro Ciénegas, Coahuila (Ref. 26684). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Gerreidae Eucinostomus argenteus Baird & Girard, 1855 Fr, Br, M native  Spotfin mojarra (English), Mojarra plateada (Spanish), Mojarra de ley (Spanish), Mojarra plateada (Spanish)  21.20 cm TL male/unsexed 12 SL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Ref. 3722. 
Gerreidae Eucinostomus currani Zahuranec, 1980 Fr, Br, M, B native  Pacific flagfin mojarra (English), Mojarra tricolor (Spanish), Mojarra tricolor (Spanish), Mojarrita bandera (Spanish)  21.00 cm TL male/unsexed  Occurs throughout the western coast (Ref. 9303). Recorded from several localities in Baja California Sur (Ref. 37955). Also Ref. 58469. 
Gerreidae Eucinostomus gracilis (Gill, 1862) Fr, Br, M, Fi, B native  Graceful mojarra (English), Mojarra charrita (Spanish), Mojarra charrita (Spanish), Mojarra (Spanish)  21.00 cm TL male/unsexed  Ranges from southern Baja California and Sinaloa southward (Ref. 9303). Recorded from several localities in Baja California Sur (Ref. 37955). Also Ref. 58469. 
Gerreidae Eugerres brevimanus (Günther, 1864) Fr, Br, M native  Shortfin mojarra (English), Mojarra aleta corta (Spanish), Mojarra de aleta corta (Spanish)  28.00 cm SL male/unsexed  Penetrates freshwater habitats (Ref. 94655). 
Gerreidae Eugerres mexicanus (Steindachner, 1863) Fr native  Mexican mojarra (English), Mojarra mexicana (Spanish), Lacandon mojarra (English), White mojarra (English), Mojarra lacandona (Spanish)  24.20 cm SL male/unsexed 17.3 TL Known from the Ríos Grijalva-Usumacinta basin in the highlands of Chiapas and Tabasco (Ref. 93806). Museum: Rio Teapa, NMF 72287 (holotype of Gerres mexicanus. UMMZ 187724 (Ref. 33568). 
Gerreidae Eugerres plumieri (Cuvier, 1830) Fr, Br, M native  Striped mojarra (English), Mojarra rayada (Spanish)  40.00 cm TL male/unsexed 17 SL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Museum: GCRL 11234, 11235; FMNH 4591 (Ref. 33568). Also Ref. 26938. 
Leuciscidae Evarra bustamantei Navarro, 1955 Fr, Thr endemic  Mexican chub (English), Carpa xochimilca (Spanish)   Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Evarra eigenmanni Woolman, 1894 Fr, Thr native  Plateau chub (English), Carpa verde (Spanish)   Also Ref. 3881. Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Evarra tlahuacensis Meek, 1902 Fr, Thr native  Endorheic chub (English), Carpa de Tláhuac (Spanish)   Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cyprinodontidae Floridichthys polyommus Hubbs, 1936 Fr native  Ocellated killifish (English), Bolín yucateco (Spanish)  19.50 cm SL male/unsexed   
Fundulidae Fundulus grandis Baird & Girard, 1853 Fr native  Gulf killifish (English), Sardinilla del Pánuco (Spanish)  18.00 cm TL male/unsexed  Only for the subspecies F. g. grandis (Ref. 27139); apparently found in Manantial Baño de San Ignacio, near Linares, San Fernando basin, Nuevo León, Mexico (Ref. 38030). Also Ref. 79012. 
Fundulidae Fundulus grandissimus Hubbs, 1936 Fr, Thr endemic  Giant killifish (English), Sardinilla gigante (Spanish)  20.00 cm TL male/unsexed 4.9 TL Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Fundulidae Fundulus heteroclitus (Linnaeus, 1766) Fr, Br, M native   15.00 cm TL male/unsexed   
Fundulidae Fundulus lima Vaillant, 1894 Fr, Thr endemic  Baja California killifish (English), Sardinilla peninsular (Spanish)  10.00 cm TL male/unsexed  Known from Baja California (Ref. 27139). Also Ref. 3881. Status of threat: endangered; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Fundulidae Fundulus persimilis Miller, 1955 Fr, Thr endemic  Yucatan killifish (English), Sardinilla yucateca (Spanish)  15.00 cm TL male/unsexed  Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Fundulidae Fundulus philpisteri García-Ramírez, Contreras-Balderas & Lozano-Vilano, 2007 Fr native      No picture yet.
Fundulidae Fundulus zebrinus Jordan & Gilbert, 1883 Fr, Br introduced   8.00 cm TL male/unsexed  Also Ref. 27139. 
Ariidae Galeichthys feliceps Valenciennes, 1840 Fr, Br, M questionable   55.00 cm TL male/unsexed  Reported from the country in Ref. 4716 (Gulf of Mexico). Outside distributional range, needs further confirmation (Ref. 85159). 
Poeciliidae Gambusia affinis (Baird & Girard, 1853) Fr, Br native  Western mosquitofish (English), Guayacón mosquito (Spanish)  5.10 cm TL male/unsexed ;7.00 cm TL female  Common; locally abundant.  
Poeciliidae Gambusia alvarezi Hubbs & Springer, 1957 Fr, Thr native  Yellowfin gambusia (English), Guayacón de San Gregorio (Spanish), Guayacon de San Gregorio (Spanish)  3.00 cm TL male/unsexed ;4.00 cm TL female  Known only from El Ojo de San Gregorio, Chihuahua and the adjacent creek (Ref. 50894). Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Gambusia atrora Rosen & Bailey, 1963 Fr native  Blackfin gambusia (English), Guayacón de San Luis (Spanish)  3.00 cm TL male/unsexed ;4.00 cm female  Known from Rio Axtla and Rio Matlapa in San Luis Potosi.  No picture yet.
Poeciliidae Gambusia aurata Miller & Minckley, 1970 Fr endemic  Golden gambusia (English), Guayacón dorado (Spanish)  3.02 cm SL male/unsexed ;4.00 cm female  Known from the Rio Guayalejo and Rio Mante region in Tamaulipas.  No picture yet.
Poeciliidae Gambusia echeagarayi (Álvarez, 1952) Fr endemic  Maya gambusia (English), Guayacón maya (Spanish)  2.94 cm TL male/unsexed ;3.50 cm female  Known only from the Rio Michol in Chiapas.  No picture yet.
Poeciliidae Gambusia eurystoma Miller, 1975 Fr, Thr endemic  Widemouth gambusia (English), Guayacón del Azufre (Spanish), Guayacon Bocon (Spanish)  3.50 cm TL male/unsexed  Known from Baños del Azufre, 10 km west of Teapa (Tabasco, Mexico) (Ref. 78716). .Found in the Grijalva system (Ref. 81264). Also Ref. 3881. Status of threat: vulnerable; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Gambusia hurtadoi Hubbs & Springer, 1957 Fr, Thr native  Crescent gambusia (English), Guayacón de Hacienda de Dolores (Spanish), Guayacon de Hacienda Dolores (Spanish)  2.50 cm TL male/unsexed ;3.50 cm TL female  Known from the Chihuahua (Ref. 50894). Found in the Río Conchos system (Ref. 81264). Also Ref. 3881. Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Gambusia krumholzi Minckley, 1963 Fr, Thr endemic  Spotfin gambusia (English), Guayacón del Nava (Spanish)  4.00 cm TL male/unsexed ;6.00 cm female  Known from the lower Río Grande system of Río Bravo del Norte (Ref. 81264). Reported from the Rio Nava in Coahuila (Ref. 26130). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Gambusia longispinis Minckley, 1962 Fr, Thr endemic  Guayacón de Cuatro Ciénegas (Spanish), Guayacon de Cuatro Cienegas (Spanish)  5.00 cm TL male/unsexed  Found in the Cuatro Ciénegas basin (Ref. 50894). Museum: small marsh adjacent to the La Angostura Canal, approx. 4 miles S, 6 miles W of Cuatro Ciénegas, Coahuila, UMMZ 179620 (holotype, 2.04 cm SL, male) (Ref. 12960). Also Ref. 3881. Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Gambusia marshi Minckley & Craddock, 1962 Fr, Br endemic  Robust gambusia (English), Guayacón de Nadadores (Spanish)  2.42 cm SL male/unsexed  Specimens collected from Rio Sabinas de Coahuila, from mainstream of the Rio Salado, and from Rio Salado de los Nadadores and many of its tributaries. Museum: Rio Salado de los Nadadores, near its junction with the Rio Salado de Monclova, 1 mile S of Hermanas, Coahuila, UMMZ 179167 (holotype, 2.42 cm SL, male); UMMZ 179168 (63 paratypes). Also Ref. 50894.  No picture yet.
Poeciliidae Gambusia myersi Ahl, 1925 Fr native      No picture yet.
Poeciliidae Gambusia panuco Hubbs, 1926 Fr endemic  Panuco gambusia (English), Guayacón del Pánuco (Spanish)  3.50 cm TL male/unsexed ;5.50 cm female  Known from the Rio Panuco system in San Luis Potosi.  No picture yet.
Poeciliidae Gambusia quadruncus Langerhans, 2012 Fr native  llanos mosquitofish (English)  2.79 cm SL male/unsexed  Known from the following drainages in east-central Mexico: Río Guayalejo-Tamesí, Río Pánuco, Laguna de Tamiahua, Río Tigre, Río Carrizal and Río Soto La Marina (Ref. 91760).  No picture yet.
Poeciliidae Gambusia regani Hubbs, 1926 Fr endemic  Forlon gambusia (English), Guayacón del Forlón (Spanish)  3.50 cm TL male/unsexed ;4.50 cm female  Occurs in the upper courses of the Rio Tamesi system in Tamaulipas.  No picture yet.
Poeciliidae Gambusia senilis Girard, 1859 Fr, Thr native  Blotched gambusia (English), Guayacón del Bravo (Spanish)  5.50 cm TL male/unsexed  Common in Rio Conchos drainage (Ref. 5723). Also Ref. 3881, 50894. Status of threat: threatened; status declined since 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Gambusia sexradiata Hubbs, 1936 Fr, Br native  Stripped gambusia (English), Guayacón del sureste (Spanish)  2.60 cm SL male/unsexed ;3.51 cm SL female  Recorded from the Rio Nautla, northern Veracruz, along the Atlantic coast of Campeche, Atlantic drainage of inland Mexico in the states of Oaxaca and Chiapas. 
Poeciliidae Gambusia speciosa Girard, 1859 Fr, Thr native  Tex-Mex gambusia (English), Guayacón de Nuevo León (Spanish)  3.00 cm TL male/unsexed ;5.00 cm TL female  Type locality: Río San Diego, near Cadereita, Nuevo León (Ref. 26282); also in the associated marsh of San Fernando basin, Nuevo León (Ref. 38030). Status of threat: threatened. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Gambusia vittata Hubbs, 1926 Fr endemic  Gulf gambusia (English), Guayacón de Victoria (Spanish)  4.50 cm TL male/unsexed ;6.00 cm female  Known from the Rio Panuco region in Tamaulipas to southern Veracruz.  No picture yet.
Poeciliidae Gambusia yucatana Regan, 1914 Fr native  Yucatan gambusia (English), Guayacón yucateco (Spanish)  5.50 cm TL male/unsexed ;8.00 cm TL female  Known from near Coatzacoalcos, Veracruz to the outer parts of Yucatan. 
Poeciliidae Gambusia zarskei Meyer, Schories & Schartl, 2010 Fr native   2.31 cm SL male/unsexed ;2.86 cm SL female    No picture yet.
Cyprinodontidae Garmanella pulchra Hubbs, 1936 Fr, Br native  Progreso flagfish (English), Cachorrito de Progreso (Spanish)  4.00 cm TL male/unsexed  Found in Yucatán (Ref. 4537, 27139). 
Gasterosteidae Gasterosteus aculeatus Linnaeus, 1758 Fr, Br, M native  Threespine stickleback (English), Espinocho (Spanish)  11.00 cm TL male/unsexed  Occurs in Baja California (Ref. 11378). Also Ref. 2850, 27436. 
Gasterosteidae Gasterosteus microcephalus Girard, 1854 Fr native   5.50 cm SL male/unsexed  Remnant population in northwestern Baja California (Ref. 47709). 
Gerreidae Gerres cinereus (Walbaum, 1792) Fr, Br, M, B native  Yellowfin mojarra (English), Mojarra trompetera (Spanish), Mojarra blanca (Spanish), Plateada (Spanish)  41.00 cm TL male/unsexed 16.4 SL Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). 
Gerreidae Gerres simillimus Regan, 1907 Fr, Br, M, Fi native  Mojarra plateada (Spanish), Mojarra rayada (Spanish)  41.00 cm TL male/unsexed  Ranges from Bahía Magdalena and the southern Gulf of California southward (Ref. 9303, 37955). Recorded from several localities in Baja California Sur (Ref. 37955). 
Leuciscidae Gila brevicauda Norris, Fischer & Minckley, 2003 Fr, Thr native  Shorttail chub (English), Carpa colicorta (Spanish), Carpita cola corta (Spanish), Shorttail chub (English)  12.90 cm SL male/unsexed ;9.39 cm SL female  Known only from Río Basaseache, a headwater of the Río Mayo Basin near the 246-m Cascada de Basaseachic, UMMZ 240260 (holotype, 9.39 cm SL, female) (Ref. 49525). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Gila conspersa Garman, 1881 Fr, Thr native  Nazas chub (English), Carpa de Mayrán (Spanish)   Known from the river basin of Nazas (Ref. 31780). Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Gila ditaenia Miller, 1945 Fr native  Sonora chub (English), Carpa sonorense (Spanish)  25.00 cm TL male/unsexed  Known from the Rio de la Concepcion River, Sonora (Ref. 86798). Also Ref. 5723. 
Leuciscidae Gila elegans Baird & Girard, 1853 Fr native  Bonytail (English), Carpa elegante (Spanish)  62.00 cm TL male/unsexed  Known from the Colorado River drainage. 
Leuciscidae Gila eremica DeMarais, 1991 Fr, Thr native  Desert chub (English), Carpa del desierto (Spanish)  8.50 cm SL male/unsexed  Known from the headwaters of the Sonora and Matape rivers of northwestern Sonora. Type locality: Río Matape, San Jose de Pimas, Sonora, México, elev. 350 m (Ref. 39604). Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Gila intermedia (Girard, 1856) Fr native  Gila chub (English), Carpa del Gila (Spanish)  38.00 cm TL male/unsexed  Found in Sonora (Ref. 86798). 
Leuciscidae Gila minacae Meek, 1902 Fr, Thr native  Mexican roundtail chub (English), Carpa cola redonda mexicana (Spanish)   Type locality, Río Paphigochic at Miñaca, Río Yaqui basin, Chihuahua (Ref. 50838). Status of threat: threatened. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Gila modesta (Garman, 1881) Fr, Thr native  Saltillo chub (English), Carpa de Saltillo (Spanish), Charalito saltillo (Spanish)   Known from Río San Juan (Ref. 81264). Occurs in one stream of the Rio Salinas system in Coahuila (Ref. 4537). Status of threat: endangered; status declined since 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Gila nigrescens (Girard, 1856) Fr native  Chihuahua chub (English), Carpa de Chihuahua (Spanish), Charalito chihuahua (Spanish)  24.00 cm TL male/unsexed  Known from Lagunas Guzman and Bustillos in Chihuahua (Ref. 5723, 86798). Also Ref. 3881. 
Leuciscidae Gila pulchra (Girard, 1856) Fr native  Conchos chub (English), Carpa del Conchos (Spanish)   Type locality: Río Chihuahua and tributaries, Chihuahua. 
Leuciscidae Gila purpurea (Girard, 1856) Fr, Thr native  Yaqui chub (English), Carpa púrpura (Spanish) scarce (very unlikely) 14.00 cm TL male/unsexed  Known from the Rio Yaqui basin (Ref. 86798). Also Ref. 3881, 5723. Status of threat: endangered; status declined since 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Gila robusta Baird & Girard, 1853 Fr native  common (usually seen) 43.00 cm TL male/unsexed  Known from Rio Yaqui south to Rio Piaxtla in northwestern Mexico (Ref. 5723). Also Ref. 86798. 
Gobiidae Gillichthys detrusus Gilbert & Scofield, 1898 Fr, Br, M native    Museum: Baja California, Colorado River at the ‘‘75-km ferry’’, CAS 82502.  No picture yet.
Goodeidae Girardinichthys ireneae Radda & Meyer, 2003 Fr, Thr endemic  Mexcalpique de Zacapu (Spanish)   Type locality, North end of Laguna de Zacapu Michoacán (Ref. 54621). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Girardinichthys multiradiatus (Meek, 1904) Fr, Or endemic  Darkedged splitfin (English), Mexcalpique de Zempoala (Spanish)  3.50 cm TL male/unsexed ;5.00 cm TL female  Occurs in the upper Rio Lerma as well as the Zempoala lagoon in Morelos. Recorded from the Balsas river basin (Ref. 58351). Range contracting in the 1990s (Ref. 27639). Also Ref. 3881, 4537, 84762. 
Goodeidae Girardinichthys viviparus (Bustamante, 1837) Fr, Fi, Thr endemic  Chapultepec splitfin (English), Mexcalpique (Spanish), Mexclapique (Spanish)  6.50 cm TL male/unsexed ;5.00 cm female  Known from Xochimilco, Lake Texcoco and Zumpango lagoon east and southeast of the center of Mexico City. Marketed as dry fish. Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Gobiesocidae Gobiesox fluviatilis Briggs & Miller, 1960 Fr, Thr native  Mountain clingfish (English), Cucharita de río (Spanish)  5.90 cm SL male/unsexed  Known from the Sinaloan coastal and Santiago drainages (Ref. 81264). Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Gobiesocidae Gobiesox juniperoserrai Espinosa Pérez & Castro-Aguirre, 1996 Fr, Thr endemic  Peninsular clingfish (English), Cucharita peninsular (Spanish)  10.52 cm SL male/unsexed  Found in Pozas del Vado creek, southwest of Sierra La Giganta, Baja California Sur (Ref. 27659). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Gobiesocidae Gobiesox mexicanus Briggs & Miller, 1960 Fr, Thr native  Mexican clingfish (English), Cucharita mexicana (Spanish)  6.90 cm SL male/unsexed  Known from the Ameca-Manantlán, Balsas, and Sierra Madre del Sur drainages (Ref. 81264). Also Ref. 36690. Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Gobiidae Gobioides peruanus (Steindachner, 1880) Fr, Br native   45.00 cm TL male/unsexed   
Eleotridae Gobiomorus maculatus (Günther, 1859) Fr, Br native   27.00 cm SL male/unsexed  Recorded from Río Yaqui (Ref. 36880). 
Eleotridae Gobiomorus polylepis Ginsburg, 1953 Fr, Br, M native  Finescale sleeper (English), Guavina cristalina (Spanish)  28.00 cm SL male/unsexed  Known from rivers near Tepic to the Río Copalita near Puerto Angel in the south, Pacific versant (Ref. 36880). Also Ref. 50190. 
Gobiidae Gobionellus microdon (Gilbert, 1892) Fr, Br native  Palmtail goby (English), Gobio cola de palma (Spanish), Gobio (Spanish)  18.40 cm SL male/unsexed  Type locality: Laguna de Mexcalititan, Nayarit, USNM 130859 (holotype of Gobionellus mystax, 14.17 cm SL, male) (Ref. 55435). Recorded from both the Tres Palos Lagoon, Guerrero and the Baluarte River (Ref. 45915). 
Gobiidae Gobionellus oceanicus (Pallas, 1770) Fr, Br, M native  Madrejuile flecha (Spanish)  27.00 cm TL male/unsexed  Known in Gulf of Mexico to Bay of Campeche (Ref. 26938). Also recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). 
Gobiidae Gobiosoma yucatanum Dawson, 1971 Fr, Br native  Yucatan goby (English), Gobio yucateco (Spanish)  2.60 cm SL male/unsexed  Occur from the harbor of Chetumal, Quintana Roo (Ref. 30499). Also Ref. 26938, 50190 
Goodeidae Goodea atripinnis Jordan, 1880 Fr, Fi endemic  Blackfin goodea (English), Tiro (Spanish)  13.00 cm TL male/unsexed ;12.00 cm TL female 6.56 SL Occurs in the central highlands, Guanajuato (Ref. 27639). Also Ref. 4537, 84762. 
Goodeidae Goodea gracilis Hubbs & Turner, 1939 Fr, Thr endemic  Dusky goodea (English), Tiro oscuro (Spanish)  8.00 cm TL male/unsexed ;12.00 cm TL female  Occurs in the Pánuco River system, San Luis Potosí (Ref. 3881). Status of threat: vulnerable; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Goodea luitpoldii (Steindachner, 1894) Fr endemic  Green goodea (English), Tiro de Pátzcuaro (Spanish), Tiro de Patzcuaro (Spanish)   Known only from Lerma-Santiago River basin (Ref. 31780).  No picture yet.
Gymnotidae Gymnotus carapo Linnaeus, 1758 Fr native   76.00 cm TL male/unsexed   
Gymnotidae Gymnotus maculosus Albert & Miller, 1995 Fr native  Spotted knifefish (English), Cuchillo (Spanish)   Recorded from Río San Nicolas, Chiapas (Ref. 36880). 
Eleotridae Hemieleotris latifasciata (Meek & Hildebrand, 1912) Fr native   12.00 cm TL male/unsexed   
Cichlidae Herichthys bartoni (Bean, 1892) Fr, Thr endemic  Media Luna cichlid (English), Mojarra caracolera (Spanish), Mojarra caracolera (Spanish)  18.00 cm SL male/unsexed  Known only from the upper Rio Verde and the Laguna de la Media Luna system of the Rio Panuco basin in San Luis Potosi (Ref. 36377). Flourishes best in the region of Laguna Media Luna. Unfortunately, the runoff of the various pesticides and herbicides from surrounding community is polluting this small unique system. Utilized as an aquarium fish (Ref. 6398). Also Ref. 6376, 7335. Status of threat: threatened; status improved since 1989 listing. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Herichthys carpintis (Jordan & Snyder, 1899) Fr endemic  Lowland cichlid (English), Mojarra tampiqueña (Spanish)  17.00 cm SL male/unsexed  Widespread in the Rio Panuco and Rio Soto la Marina basins (Ref. 7335). Also Ref. 36377. 
Cichlidae Herichthys cyanoguttatus Baird & Girard, 1854 Fr introduced  Rio Grande cichlid (English), Mojarra del norte (Spanish) common (usually seen) 30.00 cm TL male/unsexed  Introduced to Rio Verde basin (La Media Luna region), Mexico (Ref. 36377). Also Ref. 7335, 79012. 
Cichlidae Herichthys deppii (Heckel, 1840) Fr endemic  Nautla cichlid (English), Mojarra del sur (Spanish)  12.00 cm TL male/unsexed  Found in Nautla and Misantla River basins (Ref. 36377). 
Cichlidae Herichthys labridens (Pellegrin, 1903) Fr, Or, Thr endemic  Blackcheek cichlid (Spanish), Mojarra huasteca (Spanish), Mojarra caracolera amarilla (English), Mojarra (Spanish), Curve-bar cichlid (English), Yellow labridens (English)  25.00 cm SL male/unsexed  Known only from the Rio Verde and the Laguna Media Luna system in the Rio Panuco basin. Utilized as an aquarium fish (Ref. 6398). Also Ref. 3881, 36377. Status of threat: threatened; status improved since 1989 listing. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Herichthys minckleyi (Kornfield & Taylor, 1983) Fr, Thr endemic  Cuatro Ciénegas cichlid (English), Mojarra de Cuatro Ciénegas (Spanish), Mojarra caracolera de Cuatro Cienegas (Spanish)  17.50 cm SL male/unsexed  Found only in Cuatro Cienegas (Ref. 36377). Utilized as an aquarium fish (Ref. 6398). Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Herichthys molango De la Maza-Benignos & Lozano-Vilano, 2013 Fr native  Aztec cichlid (English), Mojarra Azteca (Spanish)  10.89 cm SL male/unsexed  Known from the Laguna Azteca in the headwaters of the Rio Panuco of the Rio Moctezuma Basin, 6 km north of Molango, Hidalgo (20° 48′ N, 98° 45′ O, 1280 masl). Possibly found in the Rio Santa María, Rio Venados, and Rio Amasa in the states of Queretaro and Hidalgo. Considered as C. labridens, listed as threatened by the NOM-059-ECOL-2010 and endangered by the IUCN Red List of Threatened Species 2009. Threatened by the introduction of the largemouth bass (Micropterus salmoides) and sunfish (Lepomis spp.) (Ref. 94458). 
Cichlidae Herichthys pame De la Maza-Benignos & Lozano-Vilano, 2013 Fr native  Mojarra caracolera blanca (Spanish)  11.23 cm SL male/unsexed  Known from the main stem and tributaries of the Rio Gallinas, including Rio Tamasopo, Ojo Frío, and Agua Buena, upriver from the Tamul cascade. Considered as C. labridens, listed as threatened according to NOM-059-ECOL-2010 and endangered according to the IUCN Red List of Threatened Species 2009 (Ref. 94458). 
Cichlidae Herichthys pantostictus (Taylor & Miller, 1983) Fr endemic  Chairel cichlid (English), Mojarra de Chairel (Spanish), Mojarra (Spanish)  12.60 cm SL male/unsexed  Found in the Panuco River drainage from the Sabinas River to the coastal Laguna Tamiahua (Ref. 36377). Seems to be concentrated in the cooler and clearer water of the Laguna Escondida, which is connected with the larger Laguna Chairel (Ref. 7335). Also Ref. 3881. 
Cichlidae Herichthys pratinus De la Maza-Benignos & Lozano-Vilano, 2013 Fr, Thr native  Green cichlid (English), Mojarra caracolera verde (Spanish)  12.06 cm SL male/unsexed  Occurs only in the Rio el Salto, which runs through the Sierra La Colmena, in San Luis Potosi. Considered as Herichthys labridens ,listed as threatened by the NOM-059-ECOL-2010 and endangered by the IUCN Red List of Threatened Species (Ref. 94458). 
Cichlidae Herichthys steindachneri (Jordan & Snyder, 1899) Fr, Or, Thr endemic  Slender cichlid (English), Mojarra del Ojo Frío (Spanish), Mojarra (Spanish) scarce (very unlikely) 40.00 cm SL male/unsexed  Known only from Tamasopo, Gallinas, and Ojo Frio Rivers in the Panuco River basin (Ref. 36377). Also Ref. 3881, 7335. Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Herichthys tamasopoensis Artigas Azas, 1993 Fr endemic  Mojarra del Tamasopo (English), Tamasopo cichlid (English)  18.00 cm TL male/unsexed  Known from the Tamasopo River of Panuco River basin (Ref. 36377). 
Cichlidae Herichthys tepehua De la Maza-Benignos, Ornelas-García, Lozano-Vilano, García-Ramírez & Doadrio, 2014 Fr native   13.82 cm SL male/unsexed  Known from the Tuxpan/Pantepec, Cazones, Tecolutla, Tenixtepec, and the Solteros river systems (Ref. 9935). 
Cichlidae Herichthys teporatus (Fowler, 1903) Fr native      No picture yet.
Poeciliidae Heterandria tuxtlaensis McEachran & Dewitt, 2008 Fr endemic   7.22 cm SL male/unsexed  Known only from the Lake Catemaco and tributaries of the lake and the Río Grande de Catemaco above the falls at El Salto de Eyipantla (Ref. 77058). 
Poeciliidae Heterophallus milleri Radda, 1987 Fr native  Grijalva gambusia (English), Guayacón del Grijalva (Spanish)    
Poeciliidae Heterophallus rachovii Regan, 1914 Fr endemic  Coatzacoalcos gambusia (English), Guayacón jarocho (Spanish)  2.50 cm TL male/unsexed ;3.50 cm female  Occurs in Arroyo Santiago Vasques near Jesus Carranza and Laguna de la Sapote in Veracruz.  No picture yet.
Goodeidae Hubbsina turneri de Buen, 1940 Fr, Thr endemic  Highland splitfin (English), Mexcalpique michoacano (Spanish)  5.00 cm TL male/unsexed ;6.50 cm female 3.03 SL Known from rivers and ponds of Michoacan and Guanajuato. Recorded from the reservoir region of the Rio Cuitzeo near the city of Morelia. Range contracting, endangered in the 1990s (Ref. 27639). Also Ref. 3881, 84762. Status of threat: possibly extinct. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Characidae Hyphessobrycon compressus (Meek, 1904) Fr native  Maya tetra (English), Sardinita plateada (Spanish)  4.40 cm TL male/unsexed  Recorded from El Hule, Oxaca, Basin of Rio Papaloapan. 
Xenocyprididae Hypophthalmichthys molitrix (Valenciennes, 1844) Fr introduced  Silver carp (English), Carpa plateada (Spanish), Carpa plateada (Spanish)  120 cm TL male/unsexed   
Xenocyprididae Hypophthalmichthys nobilis (Richardson, 1845) Fr introduced  Bighead carp (English), Carpa cabezona (Spanish), Carpa cabezona (Spanish)  146 cm SL male/unsexed   
Hemiramphidae Hyporhamphus meeki Banford & Collette, 1993 Fr, Br, M native  Agujeta flaca (Spanish)  20.90 cm SL male/unsexed  Occurs in the Atlantic coast, south to Yucatán (Ref. 27549). Recorded from Celestún Biosphere Reserve (Ref. 74908). 
Hemiramphidae Hyporhamphus mexicanus Álvarez, 1959 Fr native  Mexican halfbeak (English), Pajarito mexicano (Spanish)  17.30 cm SL male/unsexed  Found in the Coatzacoalcos River (Ref. 40614). Type locality, Rancho San Carlos, Río Coatzacoalcos, Palomares, Oaxaca, Mexico (Ref. 26282). 
Hemiramphidae Hyporhamphus rosae (Jordan & Gilbert, 1880) Fr, Br, M native  Pajarito californiano (Spanish), Pajarito de California (Spanish)  15.00 cm TL male/unsexed  Baja Californa and Gulf of California, Mexico (Ref. 9306).  No picture yet.
Ictaluridae Ictalurus australis (Meek, 1904) Fr, Thr endemic  Pánuco catfish (English), Bagre del Pánuco (Spanish), Bagre del Panuco (Spanish)   Status of threat: threatened; status declined since 1989. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ictalurus balsanus (Jordan & Snyder, 1899) Fr, Thr endemic  Balsas catfish (English), Bagre del Balsas (Spanish), Bagre (Spanish)   Known from the Rio Ixtla in Puente de Ixtla, Morelos. Status of threat: vulnerable. Criteria: 1,2,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ictalurus dugesii (Bean, 1880) Fr, Fi, Rstr, Thr endemic  Lerma catfish (English), Bagre del Lerma (Spanish), Bagre (Spanish) occasional (usually not seen)  Known from the Rio Turbio in Guanajuato. Regulations: catch season: 1 Sept.-30 Apr.; closed season: 1 May - 31 Aug.; fishing with "Cuevo" method is not allowed in Chapala Lake; marketed fresh (whole, fillet), frozen, or salted (Ref. 26550). Abundance declining in Lerma River basin (Ref. 27639). Status of threat: vulnerable. Criteria: 1,2 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ictalurus furcatus (Valenciennes, 1840) Fr native  Blue catfish (English), Bagre azul (Spanish), Bagre azul (Spanish)  165 cm TL male/unsexed  Known from Río Bravo (Grande) and Soto La Marina basins (Ref. 87780). Also Ref. 86798. 
Ictaluridae Ictalurus lupus (Girard, 1858) Fr, Thr native  Headwater catfish (English), Bagre lobo (Spanish) common (usually seen) 48.00 cm TL male/unsexed ;32.80 cm TL female  Locally common (Ref. 5723). Also Ref. 79012. Status of threat: threatened; status declined since 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ictalurus meridionalis (Günther, 1864) Fr native  Southern blue catfish (English), Bagre azul del sureste (Spanish)  73.00 cm SL male/unsexed  Known from Pánuco, Coatzacoalcos, Papaloapan, Grijalva, Hondo and Usumacinta basins (Ref. 87780).  No picture yet.
Ictaluridae Ictalurus mexicanus (Meek, 1904) Fr, Thr endemic  Rio Verde catfish (English), Bagre del Verde (Spanish), Bagre de Rio Verde (Spanish)   Status of threat: vulnerable; status same as 1989. Criteria: 1,2,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Ictaluridae Ictalurus ochoterenai (de Buen, 1946) Fr endemic  Chapala catfish (English), Bagre de Chapala (Spanish), Bagre (Spanish)   Endemic to Lerma River basin. Abundance declining. 
Ictaluridae Ictalurus pricei (Rutter, 1896) Fr, Thr native  Yaqui catfish (English), Bagre yaqui (Spanish), Bagre de Yaqui (Spanish), Bagre (Spanish) scarce (very unlikely) 57.00 cm TL male/unsexed  Status of threat: endangered; status declined since 1989. Criteria: 1,4 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Ictalurus punctatus (Rafinesque, 1818) Fr, Aq native  Channel catfish (English), Azul (Spanish), Bagre de canal (Spanish)  132 cm TL male/unsexed  Marketed fresh (whole, fillet), frozen, or salted (Ref. 26550). Introduced to Lerma River basin (Ref. 27639). 
Catostomidae Ictiobus bubalus (Rafinesque, 1818) Fr native  Smallmouth buffalo (English), Matalote boquín (Spanish) common (usually seen) 112 cm TL male/unsexed  Also Ref. 79012. 
Catostomidae Ictiobus labiosus (Meek, 1904) Fr, Thr native  Fleshylip buffalo (English), Matalote bocón (Spanish)   Known from Cuenca del rio Panuco (Ref. 31780). Type locality, Río Valles at Valles, Río Panuco basin, San Luis Potosí (Ref. 46206). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Catostomidae Ictiobus meridionalis (Günther, 1868) Fr native  Southern buffalo (English), Matalote meridional (Spanish), Chopa (Spanish)   Reportedly caught on a net near Balancan, Tabasco in Misicab Island (E.Perusquia as pers. comm., 02/05). 
Catostomidae Ictiobus niger (Rafinesque, 1819) Fr native  Black buffalo (English), Matalote negro (Spanish) occasional (usually not seen) 123 cm TL male/unsexed   
Goodeidae Ilyodon cortesae Paulo-Maya & Trujillo-Jiménez, 2000 Fr, Thr native  Freckled splitfin (English), Mexcalpique pecoso (Spanish)  5.15 cm SL male/unsexed  Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Ilyodon furcidens (Jordan & Gilbert, 1882) Fr, Fi endemic  Goldbreast splitfin (English), Mexcalpique de Armería (Spanish)  7.00 cm TL male/unsexed ;9.00 cm TL female  Known from Ameca-Magdalena and Armeria-Coahuayana river basins (Ref. 31780). Occurs in Colima River basin (Ref. 4537). 
Goodeidae Ilyodon lennoni Meyer & Förster, 1983 Fr endemic  Chacambero splitfin (English), Mexcalpique de Chacambero (Spanish)  7.00 cm TL male/unsexed ;8.00 cm female  Known from Chacambero Arroyo, near Altomarino, Guerrero.  No picture yet.
Goodeidae Ilyodon whitei (Meek, 1904) Fr, Thr endemic  Balsas splitfin (English), Mexcalpique cola partida (Spanish)  6.00 cm TL male/unsexed ;7.00 cm female  Known from the upper reaches of Rio Balsas system in Morelos and Michoacan. Collected from a quiet side stream of the Rio Cuautla and from a stream near Jojutla. Status of threat: vulnerable. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Ilyodon xantusi (Hubbs & Turner, 1939) Fr native  Limones splitfin (English), Mexcalpique de Los Limones (Spanish)   Known only from Armeria-Coahuayana river basin (Ref. 31780). Type locality, Quiet pools of a small trib. of Río Colima, Hacienda Los Limones, Colima (Ref. 46206). 
Mugilidae Joturus pichardi Poey, 1860 Fr, Br, Fi native  Bobo (Spanish), Liza bobo (Spanish)  61.00 cm TL male/unsexed  Also Ref. 3791, 50865. 
Cichlidae Kihnichthys ufermanni (Allgayer, 2002) Fr, Thr native  Usumacinta cichlid (English), Mojarra del Usumacinta (Spanish)  25.00 cm SL male/unsexed  Known from Usumacinta River basin (Ref. 36377). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Rivulidae Kryptolebias marmoratus (Poey, 1880) Fr, Thr native  Almirante de manglar (Spanish)  7.50 cm TL male/unsexed  Status of threat: vulnerable; status same as 1989. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Lacantuniidae Lacantunia enigmatica Rodiles-Hernández, Hendrickson & Lundberg, 2005 Fr, Thr native  Chiapas catfish (English), Bagre de Chiapas (Spanish), Chiapas catfish (English), Bagre de Chiapas (Spanish)  42.70 cm SL male/unsexed ;40.60 cm SL female  Found in the Ríos Lacantún and Lacanjá, tributaries of Río Usumacinta basin, Chiapas. Type locality, Chiapas, Rio Usumacinta basin, Río Lacantún, Selva Lacandona, Reserva de la Biosfera Montes Azules (42.7 cm SL, male) (Ref. 54757). Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Sparidae Lagodon rhomboides (Linnaeus, 1766) Fr, Br, M native  Pinfish (English), Xlavitia (Spanish), Chopa espina (Spanish), Sargo (Spanish)  40.00 cm TL male/unsexed 13.1 SL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Ref. 3815. 
Lepisosteidae Lepisosteus osseus (Linnaeus, 1758) Fr, Br, Fi native  Catán aguja (Spanish), Pejelagarto (Spanish), Catán (Spanish)  200 cm TL male/unsexed  Year round fishing; marketed fresh (whole, fillet), frozen, smoked, or as cracklings (Ref. 26550). Reported from Quebec to northern Mexico (Ref. 27549, 93252). Also Ref. 3728, 79012. 
Centrarchidae Lepomis auritus (Linnaeus, 1758) Fr introduced   30.50 cm TL male/unsexed   
Centrarchidae Lepomis cyanellus Rafinesque, 1819 Fr native  Pez sol (Spanish)  31.00 cm TL male/unsexed  Introduced and established in the Lerma River basin (Ref. 27639). 
Centrarchidae Lepomis gulosus (Cuvier, 1829) Fr introduced  Mojarra golosa (Spanish)  31.00 cm TL male/unsexed   
Centrarchidae Lepomis macrochirus Rafinesque, 1819 Fr, Fi native  Mojarra oreja azul (Spanish)  41.00 cm TL male/unsexed   
Centrarchidae Lepomis megalotis (Rafinesque, 1820) Fr native  Longear sunfish (English), Mojarra gigante (Spanish)  24.00 cm TL male/unsexed   
Centrarchidae Lepomis microlophus (Günther, 1859) Fr not established  Mojarra oreja roja (Spanish)  43.20 cm TL male/unsexed   
Centrarchidae Lepomis punctatus (Valenciennes, 1831) Fr not established   20.00 cm TL male/unsexed   
Dorosomatidae Lile stolifera (Jordan & Gilbert, 1882) Fr, Br, M, Fi native  Striped herring (English), Sardinita rayada (Spanish), Sardina rayada (Spanish), Sardineta (Spanish)  15.90 cm TL male/unsexed  Ranges from the Gulf of California to Jalisco and southwestern coast of Baja California Sur (Ref. 9291). Recorded from several localities in Baja California Sur (Ref. 37955). Utilized as a foodfish as well as a source of oil and fishmeal (Ref. 37955). Also Ref. 50313, 96339. 
Fundulidae Lucania interioris Hubbs & Miller, 1965 Fr, Thr endemic  Cuatro Cienegas killifish (English), Sardinilla de Cuatro Ciénegas (Spanish), Sardinilla Cuatro Cienegas (Spanish)  4.00 cm TL male/unsexed  Occurs in Cuatrociénegas basin in Coahuila (Ref. 3881, 27139). Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Fundulidae Lucania parva (Baird & Girard, 1855) Fr, Br, M native  Rainwater killifish (English), Sardinilla de lluvia (Spanish)  6.20 cm TL male/unsexed 2.5 TL Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Ref. 5723, 79012. 
Leuciscidae Macrhybopsis aestivalis (Girard, 1856) Fr native  Speckled chub (English), Carpa pecosa (Spanish)  12.70 cm TL male/unsexed  Known from the Rio Grande drainage to San Fernando River (Ref. 86798). Also Ref. 86798. 
Cichlidae Maskaheros argenteus (Allgayer, 1991) Fr endemic  White cichlid (English), Mojarra pozolera (Spanish)  27.00 cm TL male/unsexed  Restricted to the southeastern sections of the Rio Usumacinta basin. Also Ref. 36377. 
Cichlidae Maskaheros regani (Miller, 1974) Fr endemic  Almoloya cichlid (English), Mojarra del Almoloya (Spanish), Mojarra pinto (Spanish)  23.00 cm SL male/unsexed  Found only in the upper reaches of the Rio Coatzocoalcos basin in the rivers Rio Almoloya, Rio Jaltepec, Rio Malotengo and Rio Sarabia. 
Cichlidae Mayaheros aguadae (Hubbs, 1936) Fr endemic   9.50 cm SL male/unsexed  Found in Tuxpeña (Ref. 36377).  No picture yet.
Cichlidae Mayaheros alborus (Hubbs, 1936) Fr, Thr endemic  Mojarra de Montecristo (Spanish)  18.60 cm SL male/unsexed  Known from Rio Usumacinta (Ref. 36377). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros amarus (Hubbs, 1936) Fr, Thr endemic  Mojarra de Isla de Mujeres (Spanish)  15.80 cm SL male/unsexed  Found in Mujeres Island, off the eastern coast of Yucatán (Ref. 36377). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros beani (Jordan, 1889) Fr, Br, Fi, Or endemic  Sinaloa cichlid (English), Mojarra de Sinaloa (Spanish), Mojarra verde (Spanish)  30.00 cm TL male/unsexed  Known from the Rio Presidio to the Rio Grande de Santiago. Exported to North America as an aquarium fish (Ref. 4537). Also Ref. 3814. 
Cichlidae Mayaheros cienagae (Hubbs, 1936) Fr, Thr endemic  Mojarra de las ciénegas (Spanish)  11.30 cm SL male/unsexed  Known from the Yucatán-Quintana Roo drainages (Ref. 81264). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros conchitae (Hubbs, 1936) Fr, Thr endemic  Mojarra del Cenote Conchita (Spanish)  6.40 cm SL male/unsexed  Known from Conchita Cenote, Merida, Yucatán (Ref. 36377). Status of threat: possibly extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros ericymba (Hubbs, 1938) Fr, Thr endemic  Mojarra de San Bulha (Spanish), Mojarra de Bulha (Spanish)  12.20 cm SL male/unsexed  Known from San Bulha cenote (Ref. 36377). Also Ref. 12255. Status of threat: possibly extinct; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros mayorum (Hubbs, 1936) Fr, Thr endemic  Mojarra de Chichén Itzá (Spanish)  9.60 cm SL male/unsexed  Known from the Yucatán-Quintana Roo drainages (Ref. 81264). Type locality: Xtolok Cenote, Chichen Itza, Yucatán, Mexico. Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Mayaheros stenozonus (Hubbs, 1936) Fr native   11.00 cm TL male/unsexed    No picture yet.
Cichlidae Mayaheros troschelii (Steindachner, 1867) Fr native   16.00 cm SL male/unsexed    No picture yet.
Cichlidae Mayaheros urophthalmus (Günther, 1862) Fr, Br, Thr native  Mayan cichlid (English), Mojarra del sureste (Spanish), Castarrica (Spanish)  39.40 cm TL male/unsexed 7.5 SL Known from the Rio Coatzacoalcos basin. Also recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Re.f 4537. 
Cichlidae Mayaheros zebra (Hubbs, 1936) Fr, Thr native  Mojarra del Cenote Xlaká (Spanish)  10.40 cm SL male/unsexed  Known from Xlaka Cenote, Merida, Yucatán (Ref. 36377). Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Megalopidae Megalops atlanticus Valenciennes, 1847 Fr, Br, M native  Sábalo (Spanish)  250 cm TL male/unsexed  Found in Río Pánuco, Río Papaloapan, Río Coatzacoalcos, Río Usunacinta, and Río Hondo (Ref. 57533). 
Cyprinodontidae Megupsilon aporus Miller & Walters, 1972 Fr, Fi, Or, Thr endemic  Catarina pupfish (English), Cachorrito enano de Potosí (Spanish), Cachorrito Enano de Potosi (Spanish)  4.00 cm TL male/unsexed  Known from the Río San Juan system (Ref. 81264). Also Ref. 6376, 27139. Status of threat: extirpated in nature. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Atherinopsidae Menidia audens Hay, 1882 Fr native   15.00 cm TL male/unsexed    No picture yet.
Atherinopsidae Menidia beryllina (Cope, 1867) Fr, Br, M native  Plateadito salado (Spanish) common (usually seen) 15.00 cm TL male/unsexed  Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also from Vera Cruz (Ref. 93252). 
Atherinopsidae Menidia colei Hubbs, 1936 Fr, Thr native  Golden silverside (English), Plateadito de Progreso (Spanish)  4.20 cm SL male/unsexed  Type locality, southwest of Progreso, Yucatán, Mexico (Ref. 26282). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Centrarchidae Micropterus dolomieu Lacepède, 1802 Fr introduced   69.00 cm TL male/unsexed   
Centrarchidae Micropterus salmoides (Lacepède, 1802) Fr, Fi, Aq, Rstr native  Largemouth bass (English), Lobina negra (Spanish), Huro (Spanish), Lobina negra (Spanish) scarce (very unlikely) 97.00 cm TL male/unsexed  Average catch from 1985-90 was around 1500 tons live weight (Ref. 26550). Regulations: catch season: 1 Jun. - 31 Mar.; closed season: 1 Apr. - 31 May; sport fishery: 10 kg/day and 20 cm TL as minimum size; marketed fresh (whole, fillet) (Ref. 26550). Introduced in the Lerma River basin (Ref. 27639). Two host-specific parasites: an ancyrocephalid monogean and the trematode Crepidostomum cornutum were introduced into Lake Pátzcuaro together with the species (Ref. 48731). Listed as rare in the IUCN Red List (Ref. 3881). Also Ref. 86798. 
Rivulidae Millerichthys robustus (Miller & Hubbs, 1974) Fr, Thr endemic  Mexican rivulus (English), Almirante mexicano (Spanish), Rivulus almirante (Spanish)  4.00 cm TL male/unsexed  Known from the Papaloapan and Coatzacoalcos river basins (Ref. 36579). Also Ref. 3881, 27139. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Moronidae Morone chrysops (Rafinesque, 1820) Fr introduced   45.00 cm TL male/unsexed   
Moronidae Morone saxatilis (Walbaum, 1792) Fr, Br, M introduced  Lobina estriada (Spanish), Lubina estriada (Spanish)  200 cm TL male/unsexed  Up to Ensenada, Mexico (Ref. 9320). 
Catostomidae Moxostoma albidum (Girard, 1856) Fr native  Matalote blanco (Spanish)     No picture yet.
Catostomidae Moxostoma austrinum Bean, 1880 Fr, Fi, Thr native  Mexican redhorse (English), Matalote chuime (Spanish), Matalote chuime (Spanish) occasional (usually not seen) 49.00 cm TL male/unsexed  Pacific slope from Mezquital to Ameria River (Ref. 4537). Range contracting in Lerma River basin. Uncommon in Ayuquila River. Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Catostomidae Moxostoma congestum (Baird & Girard, 1854) Fr questionable   65.00 cm TL male/unsexed  Reported to be locally common (Ref. 5723). Occurrence in this country is uncertain (Ref. 52299). 
Catostomidae Moxostoma mascotae Regan, 1907 Fr native  Mascota jumprock (English), Matalote de Mascota (Spanish)   Collected together with Allotoca goslinei and Poeciliopsis infans at Potrero Grande, Jalisco (Ref. 58357).  No picture yet.
Mugilidae Mugil cephalus Linnaeus, 1758 Fr, Br, M, Fi, Aq, Rstr native  Striped mullet (English), Lisa rayada (Spanish), Liza cabezona (Spanish), Lisa (Spanish)  100.00 cm SL male/unsexed 37.3 TL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Marketed fresh (whole, fillet, spat), salt-dried, smoked, or as salt-dried fish roe. Regulations: catch season: 1 Feb.-30 Nov. (Baja California to Jalisco), 1 Jan.- 31 Oct. (Colima to Chaipas), 16 Mar.-14 Nov. and 1-31 Jan. (Gulf of Mexico); closed season: 1 Dec.-31 Jan. (Baja California to Jalisco), 1 Nov.-31 Dec. (Colima to Chaipas), 15 Nov.-31 Dec. and 1 Feb.-15 Mar. (Tamaulipas and Veracruz); minimum size: 30 cm TL; mesh size: 3.5 in. (Pacific coast) and 4 in. (Gulf of Mexico) (Ref. 26550). 
Mugilidae Mugil curema Valenciennes, 1836 Fr, Br, M, Fi, Rstr native  White mullet (English), Lisa blanca (Spanish), Lisa blanca (Spanish), Lebrancha (Spanish), Liseta (Spanish)  91.00 cm TL male/unsexed 27.4 TL Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Marketed fresh (whole, fillet), dried-salted, or as dried-salted fish roe. Fishing regulations: catch season:1Jul.-31 Mar. (Baja California to Jalisco), 16 Jul.-15 May (Colima to Chiapas), 16 Mar.-14 Nov. and 1-31 Jan. (Gulf of Mexico); closed season: 1 Apr.- 30 Jun. (Baja California to Jalisco), 16 May-15 Jul. (Colima to Chiapas), 15 Nov.-31 Dec. and 1 Feb.-15 Mar. (Tamaulipas and Veracruz); minimum size: 28 cm TL (Pacific coast) and 26 cm TL (Gulf of Mexico); mesh size: 2.75 in. (Pacific coast) and 3 in. (Gulf of Mexico) (Ref. 26550). Also Ref. 50313. 
Xenocyprididae Mylopharyngodon piceus (Richardson, 1846) Fr introduced  Caracolera (Spanish), Carpa negra (Spanish)  180 cm TL male/unsexed   
Leuciscidae Notropis aguirrepequenoi Contreras-Balderas & Rivera-Teillery, 1973 Fr, Thr endemic  Soto la Marina shiner (English), Carpita del Pilón (Spanish), Sardinita del Pilon (Spanish)  4.60 cm TL male/unsexed  Also Ref. 3881. Status of threat: threatened; status declined since 1989. Criteria: 1,3,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Notropis amabilis (Girard, 1856) Fr native  Texas shiner (English), Carpita texana (Spanish) fairly common (chances are about 50%) 6.20 cm TL male/unsexed   
Leuciscidae Notropis amecae Chernoff & Miller, 1986 Fr, Thr endemic  Ameca shiner (English), Carpita del Ameca (Spanish)  4.14 cm SL male/unsexed  Known only from the upper part of the Río Ameca basin, Jalisco, at elevations above 1,300 meters. This river drains into the Pacific at Bahía de Banderas, north of Puerto Vallarta. In the upper Ameca, the new species had been captured in the main river and in two tributaries, near the east of the town. The last known record of capture was in 21 April 1969 in a tributary to Río Ameca just west of Ameca, on the road to Mascota (Ref. 52300). Reported to be extinct (Ref. 32716). Type locality, Río Teuchitlán, UMMZ 212500 (3.74 cm SL, female). Status of threat: endangered; status improved since 1989 listing. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis aulidion Chernoff & Miller, 1986 Fr, Thr endemic  Durango shiner (English), Carpita de Durango (Spanish)   Formely occurred in the Rio Tunal in Durango. Reported to be extinct (Ref. 32716). Also Ref. 3881. Status of threat: possibly extinct. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis boucardi (Günther, 1868) Fr native  Balsas shiner (English), Capita del Balsas (Spanish)     No picture yet.
Leuciscidae Notropis braytoni Jordan & Evermann, 1896 Fr native  Tamaulipas shiner (English), Carpita tamaulipeca (Spanish)  6.90 cm TL male/unsexed  Endemic to Rio Grande and Rio Conchos drainages (Ref. 79012). 
Leuciscidae Notropis buchanani Meek, 1896 Fr native  Ghost shiner (English), Carpita fantasma (Spanish)  6.40 cm TL male/unsexed   
Leuciscidae Notropis calabazas Lyons & Mercado-Silva, 2004 Fr, Thr native  Calabazas shiner (English), Carpita del Calabazas (Spanish)  2.68 cm SL male/unsexed  Known only from the Río Calabazas, a small tributary of the Río Verde, which is a major branch of the upper Río Pánuco basin in San Luis Potosi state, central Mexico (Ref. 54509). Status of threat: endangered. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis calientis Jordan & Snyder, 1899 Fr, Thr endemic  Yellow shiner (English), Carpita amarilla (Spanish)   Range contracting in the Lerma River basin. Type locality: Río Verde at Aguascalientes, Mexico. Status of threat: vulnerable. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis chihuahua Woolman, 1892 Fr native  Chihuahua shiner (English), Carpita chihuahuense (Spanish) common (usually seen) 8.00 cm TL male/unsexed  Also Ref. 79012. 
Leuciscidae Notropis cumingii (Günther, 1868) Fr, Thr native  Atoyac chub (English), Carpita del Atoyac (Spanish)   Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis grandis Domínguez-Domínguez, Pérez-Rodríguez, Escalera-Vázquez & Doadrio, 2009 Fr, Thr native  Zacapu shiner (English), Carpita de Zacapu (Spanish), Zacapu shiner (English)  4.56 cm SL male/unsexed  Found only in the Zacapu Lake and its outlet in Michoacan. The introduction of the exotic carp species Cyprinus carpioand Ctenopharyngodon idella and their parasite Bothriocephalus acheilognathi Yamaguti, 1934 seems to pose a negative impact on this species. Water mass in the lake has decreased due to reduction of water inflow to the springs that feeds the lake and drying of the original marshy area for agricultural purposes. This water mass reduction had detrimental impacts on the Zacapu Lake population of Zoogoneticus quitzeoensis (Bean, 1897), severely comprising genetic diversity and increasing the extinction risk of its fish populations. This fish species should be considered in danger of extinction under the Mexican environmental law and based on the criteria of Risk Evaluation Method (Método de Evalucaión de Riesgo-MER). Also it is proposed that this should be classified as critically endangered based on IUCN criteria (Ref. 84762).  No picture yet.
Leuciscidae Notropis imeldae Cortés, 1968 Fr endemic  Sardinita de Rio Verde (Spanish)     No picture yet.
Leuciscidae Notropis jemezanus (Cope, 1875) Fr native  Rio Grande shiner (English), Carpita del Bravo (Spanish) occasional (usually not seen) 7.50 cm TL male/unsexed  Known from Rio Grande (Ref. 5723). Also Ref. 79012. 
Leuciscidae Notropis marhabatiensis Domínguez-Domínguez, Pérez-Rodríguez, Escalera-Vázquez & Doadrio, 2009 Fr, Thr native  Maravatío shiner (English), Carpita de Maravatío (Spanish), Maravatío shiner (English)  5.08 cm SL male/unsexed  Found only in San Miguel Spring in southeast region of Maravatio town in the upper Lerma River drainage in Michoacan. Only small population was recorded in 2000 and 2002. The species was not anymore found from 2004 to 2007. The spring is under intense human pressure as a recreation and washing place. Absence of this species from the spring could be possibly due to the recent introductions of alien species Poecilia reticulata, Heterandria bimaculata and Oreochromis sp. (Ref. 84762). The species should be considered in danger of extinction based on the Risk Evaluation Method done by Sanchez et al. 2007 (Ref. 84762). Status of threat: critically endangered.  No picture yet.
Leuciscidae Notropis moralesi de Buen, 1955 Fr, Thr endemic  Papaloapan chub (English), Carpita del tepelmeme (Spanish), Carpita tepelneme (Spanish), Sardinita de Tepelmene (Spanish)   Status of threat: threatened; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Notropis nazas Meek, 1904 Fr native  Nazas shiner (English), Carpita de Nazas (Spanish)   Type locality: Río Nazas at Santiago Papasquiaro, Durango, Mexico.  No picture yet.
Leuciscidae Notropis saladonis Hubbs & Hubbs, 1958 Fr, Thr native  Salado shiner (English), Carpita del Salado (Spanish), Sardinita de Salado (Spanish)   Status of threat: possibly extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Leuciscidae Notropis stramineus (Cope, 1865) Fr native  Sand shiner (English), Carpita arenera (Spanish) common (usually seen) 8.20 cm TL male/unsexed   
Leuciscidae Notropis tropicus Hubbs & Miller, 1975 Fr native  Pygmy shiner (English), Carpita tropical (Spanish)   Type locality, Río Guayalejo at Llera, Tamaulipas, México (Ref. 52299). 
Carangidae Oligoplites saurus (Bloch & Schneider, 1801) Fr, Br, M native  Leatherjack (English), Piña sietecueros (Spanish), Zapatero sietecueros (Spanish), Cacana (Spanish), Chaqueta de cuero (Spanish), Cuchillo (Spanish), Huelva (Spanish), Monda (Spanish), Perritp (Spanish), Zapatero (Spanish)  35.00 cm TL male/unsexed  Recorded from Laguna de Términos (Ref. 79080) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). 
Salmonidae Oncorhynchus chrysogaster (Needham & Gard, 1964) Fr, Thr endemic  Trucha dorada mexicana (Spanish)   Also Ref. 3881. Status of threat: vulnerable; status declined since 1989. Criteria: 1,2,3,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Salmonidae Oncorhynchus kisutch (Walbaum, 1792) Fr, Br, M native  Salmón plateado (Spanish), Salmón plateado (Spanish) occasional (usually not seen) 108 cm TL male/unsexed ;65.50 cm female  Occurs infrequently as far south as Chamalu Bay in Baja California Also Ref. 1998, 5723, 27436. 
Salmonidae Oncorhynchus mykiss (Walbaum, 1792) Fr, Br, M, Fi, Aq native  Rainbow trout (English), Trucha arcoiris (Spanish), Trucha arcoiris (Spanish), Baja California rainbow trout (English) common (usually seen) 122 cm TL male/unsexed  Occurs in northern Baja California (Ref. 27436) near Ciudad Durango (Ref. 96339). Year round fishing; marketed fresh (whole, gutted), frozen or smoked (Ref. 26550). Introduced to the Lerma River basin (Ref. 27639). Also Ref. 43638. 
Salmonidae Oncorhynchus tshawytscha (Walbaum, 1792) Fr, Br, M stray  Salmón boquinegra (Spanish)  150 cm TL male/unsexed  Caught in Bahia Sebastian Vizcaino (off Scammon Lagoon), Baja California Sur by hook and line of a local angler. The date of appearance in Baja California Sur, its ripe gonads and practically non-existent rivers or streams in Mexico suggest a case of extreme straying (Ref. 42864). Also Ref. 1998, 96339. 
Synbranchidae Ophisternon aenigmaticum Rosen & Greenwood, 1976 Fr native  Obscure swamp eel (English), Anguila falsa (Spanish)  80.00 cm TL male/unsexed  Also Ref. 27148.  No picture yet.
Synbranchidae Ophisternon infernale (Hubbs, 1938) Fr, Thr endemic  Blind swamp eel (English), Anguila ciega yucateca (Spanish), Anguila ciega (Spanish)   Known from the Yucatán-Quintana Roo ecoregion (Ref. 81264). Found in the cave systems of Yucatán (Ref. 27299). Also Ref. 4537, 79717. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Oreochromis aureus (Steindachner, 1864) Fr, Br, Fi introduced  Blue tilapia (English), Tilapia azul (Spanish), Tilapia azul (Spanish), Mojarra (Spanish), Tilapia áurea (Spanish) abundant (always seen in some numbers) 45.70 cm TL male/unsexed 17.5 SL Introduced and established in the Lerma River basin (Ref. 27639), 
Cichlidae Oreochromis mossambicus (Peters, 1852) Fr, Br introduced  Mozambique tilapia (English), Tilapia mosambica (Spanish), Mojarra (Spanish), Tilapia mozámbica (Spanish)  39.00 cm SL male/unsexed  Introduced and established in the Lerma River basin (Ref. 27639). Also know from Laguna Chichancanab (Yucatan peninsula), where it was introduced in the 1980's (Ref. 57444). Also Ref. 3. 
Cichlidae Oreochromis niloticus (Linnaeus, 1758) Fr, Br introduced  Nile tilapia (English), Tilapia del Nilo (Spanish), Mojarra (Spanish), Tilapia nilótica (Spanish)  60.00 cm SL male/unsexed  The monogean Cichlidogyrus sclerosus an African helminth has been found from tilapia in southern Mexico, a hitchiker from the introduction of the species (Ref. 48731). Recorded from Laguna de Términos (Ref. 79080). Also Ref. 9987. 
Cichlidae Oscura heterospila (Hubbs, 1936) Fr native  Montecristo cichlid (English), Mojarra de Montecristo (Spanish), Colorado (Spanish), Pozolera (Spanish)  24.00 cm SL male/unsexed  Known from the Candelaria and Usumacinta Rivers (Ref. 36377). Also Ref. 7335, 12251. 
Cichlidae Parachromis friedrichsthalii (Heckel, 1840) Fr, Br native  Yellowjacket (English), Mojarra del San Juan (Spanish), Castarrica (Spanish), Molula (Spanish)  28.00 cm SL male/unsexed  Known from Rio Coatzacoalcos basin (Ref. 7335). Also found in the Usumacinta River (Ref. 36377). Also Ref. 4537. 
Cichlidae Parachromis managuensis (Günther, 1867) Fr introduced  Jaguar guapote (English), Mojarra de Managua (Spanish), Pinta (Spanish)  55.00 cm TL male/unsexed   
Cichlidae Paraneetroplus bulleri Regan, 1905 Fr endemic  Sarabia cichlid (English), Mojarra del Sarabia (Spanish), Corrientero (Spanish)  25.50 cm SL male/unsexed  Endemic to the upper reaches of the Rio Coatzocoalcos basin in the rivers Rio Almoloya, Rio Jaltepec, Rio Malotengo and Rio Sarabia (Ref. 7335). Also Ref. 36377. 
Cichlidae Paraneetroplus gibbiceps (Steindachner, 1864) Fr endemic  Teapa cichlid (English), Mojarra del Teapa (Spanish), Corrientero verde (Spanish), Roquera (Spanish)  23.00 cm SL male/unsexed  Known from the Usumacinta River basin (Ref. 36377). Found in the reaches of the Rio Grijalva basin (Ref. 7335). 
Cichlidae Paraneetroplus nebulifer (Günther, 1860) Fr endemic  Papaloapan cichlid (English), Mojarra del Papaloapan (Spanish), Chonga (Spanish), Playero (Spanish)  20.00 cm TL male/unsexed  Knwon from the Rio San Juan drainage south of the Rio Papaloapan (Ref. 7335). Also Ref. 36377. 
Percidae Percina macrolepida Stevenson, 1971 Fr native  Bigscale logperch (English), Perca escamona (Spanish) occasional (usually not seen) 11.00 cm TL male/unsexed   
Cichlidae Petenia splendida Günther, 1862 Fr native  Giant cichlid (English), Tenguayaca (Spanish), Tenguajagua (Spanish), Tenguayaca (Spanish)  50.00 cm SL male/unsexed  Known from the Grijalva River to Usumacinta River (Ref. 36377). Found in the Rio Papaloapan basin (Ref. 7335). Also Ref. 12251. 
Cyprinidae Pethia conchonius (Hamilton, 1822) Fr introduced   14.00 cm TL male/unsexed   
Poeciliidae Phallichthys fairweatheri Rosen & Bailey, 1959 Fr native  Picotee livebearer (English), Topo (Spanish)  3.75 cm SL male/unsexed ;4.50 cm female  Found in the Rio San Pedro de Martir system. 
Leuciscidae Pimephales promelas Rafinesque, 1820 Fr native  Fathead minnow (English), Carpita cabezona (Spanish) common (usually seen) 10.10 cm TL male/unsexed   
Leuciscidae Pimephales vigilax (Baird & Girard, 1853) Fr native  Bullhead minnow (English), Carpita cabeza de toro (Spanish) common (usually seen) 9.20 cm TL male/unsexed  Also Ref. 79012. 
Atherinopsidae Poblana alchichica de Buen, 1945 Fr, Thr endemic  Alchichica silverside (English), Charal de Alchichica (Spanish), Charal de Alchichica (Spanish)   Known from the Lerma-Chapala system (Ref. 81264). Status of threat: threatened; status same as 1989. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Poblana ferdebueni Solórzano & López, 1965 Fr, Thr endemic  Chignahuapan silverside (English), Charal de Almoloya (Spanish)   Known from the Lerma-Chapala system (Ref. 81264). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Poblana letholepis Álvarez, 1950 Fr, Thr endemic  La Preciosa silverside (English), Charal de La Preciosa (Spanish), Charal de la Preciosa (Spanish)   Known from the Lerma-Chapala system (Ref. 81264). Status of threat: threatened; status same as 1989. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Atherinopsidae Poblana squamata Álvarez, 1950 Fr, Thr endemic  Quechulac silverside (English), Charal de Quechulac (Spanish), Charal de Quechulac (Spanish)   Known from the Lerma-Chapala system (Ref. 81264). Status of threat: threatened; status same as 1989. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poecilia butleri Jordan, 1889 Fr native  Topote del Pacifico (Spanish)  7.00 cm TL male/unsexed ;8.00 cm TL female  Known from Rio Presidio, Sinaloa (Ref. 42987).  No picture yet.
Poeciliidae Poecilia catemaconis Miller, 1975 Fr, Thr endemic  Bicolor molly (English), Topote de Catemaco (Spanish)  8.00 cm TL male/unsexed ;10.50 cm TL female  Known from Lake Catemaco, Veracruz (Ref. 42987). Status of threat: vulnerable. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Poecilia chica Miller, 1975 Fr, Thr endemic  Topote del Purificación (Spanish)  3.00 cm TL male/unsexed ;5.00 cm TL female  Known from La Huerta, Jalisco (Ref. 42987). Found in the Ameca-Manantlán system (Ref. 81264). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Poecilia formosa (Girard, 1859) Fr, Br native  Amazon molly (English), Topote amazona (Spanish)  9.60 cm TL male/unsexed  Known from the Atlantic coast south to Veracruz (Ref. 5723); Manantial Baño de San Ignacio, near Linares, San Fernando basin, Nuevo León (Ref. 38030). 
Poeciliidae Poecilia kykesis Poeser, 2002 Fr native   13.00 cm SL male/unsexed ;10.00 cm SL female  Occurs in the lowlands of southeastern Mexico from about 30 km west of Cárdenas, Tabasco eastward to Quintana Roo (Ref. 35631). Known from the Yucatan Peninsula (Ref. 84929). 
Poeciliidae Poecilia latipinna (Lesueur, 1821) Fr, Br, M native  Sailfin molly (English), Topote velo negro (Spanish)  15.00 cm TL male/unsexed ;10.00 cm TL female  Known from Tuxpan, Veracruz (Ref. 129076). Also Ref. 7251, 79012. 
Poeciliidae Poecilia latipunctata Meek, 1904 Fr, Thr endemic  Tamesi molly (English), Topote del Tamesí (Spanish), Molly del Tamesi (Spanish)  5.00 cm TL male/unsexed ;6.00 cm TL female  Known from the Rio Panuco basin in Tamaulipas (Ref. 26130). Recorded from Tamesí River system (Ref. 3881). Also Ref. 42987. Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Poecilia maylandi Meyer, 1983 Fr endemic  Balsas molly (English), Topote del Balsas (Spanish)  9.50 cm TL male/unsexed ;11.00 cm female  Known from the Rio Balsas system, specifically the Arroyo Chacambero in Guerrero (Ref. 26130). 
Poeciliidae Poecilia mexicana Steindachner, 1863 Fr native  Shortfin molly (English), Topote del Atlántico (Spanish)  11.00 cm SL male/unsexed  Introduced and established in the Lerma River basin (Ref. 27639). A distinct population of the species is present in the Cueva del Azufre system in the Mexican state of Tabasco (Ref. 78716). Also Ref. 1739, 42987. 
Poeciliidae Poecilia orri Fowler, 1943 Fr native  Mangrove molly (English), Topote de manglar (Spanish)  5.60 cm SL male/unsexed  Found in Quintana Roo.  
Poeciliidae Poecilia reticulata Peters, 1859 Fr introduced  Gupi (Spanish)  5.00 cm SL male/unsexed ;6.00 cm SL female  Introduced and established in the Lerma River basin (Ref. 27639). Recorded from the Balsas river basin (Ref. 58351). Also Ref. 1739, 84762. 
Poeciliidae Poecilia sphenops Valenciennes, 1846 Fr, Br native  Mexican molly (English), Topote mexicano (Spanish)  7.50 cm SL male/unsexed 3.17 SL Known from Veracruz (Ref. 42987). Also Ref. 129076. 
Poeciliidae Poecilia sulphuraria (Álvarez, 1948) Fr, Thr endemic  Sulphur molly (English), Topote de Teapa (Spanish), Molly del Teapa (Spanish)  5.00 cm TL male/unsexed  Known from Baños del Azufre, 10 km west of Teapa (Tabasco, Mexico) (Ref. 42987). Found in the Grijalva system (Ref. 81264). Also Ref. 78716. Status of threat: threatened; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poecilia velifera (Regan, 1914) Fr, Br, Thr endemic  Yucatan molly (English), Topote aleta grande (Spanish)  15.00 cm TL male/unsexed 3.4 SL Known from the Yucatán-Quintana Roo and the lower Usumacinta-Laguna de Términos systems (Ref. 81264). Recorded from Progreso (Ref. 42987) and Celestún Biosphere Reserve, Yucatan (Ref. 74908). Also Ref. 1739. Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Poeciliopsis baenschi Meyer, Radda, Riehl & Feichtinger, 1986 Fr endemic  Golden livebearer (English), Guatopote dorado (Spanish)  2.50 cm TL male/unsexed ;3.00 cm female  Foound in a creek near El Tuito in Jalisco as well as tributaries of the Rio Purificacion near La Huerta.  No picture yet.
Poeciliidae Poeciliopsis balsas Hubbs, 1926 Fr endemic  Balsas livebearer (English), Guatopote del Balsas (Spanish)  3.50 cm TL male/unsexed ;6.50 cm female  Found in the Rio Balsas basin and in the small Rio Arteaga and Rio Aguililla in Michoacan (Ref. 26130). Recorded from the Balsas river basin (Ref. 58351). 
Poeciliidae Poeciliopsis catemaco Miller, 1975 Fr, Thr endemic  Catemaco livebearer (English), Guatopote blanco (Spanish)  4.00 cm TL male/unsexed ;8.00 cm female  Known from the Laguna de Catemaco in Veracruz (Ref. 26130). Status of threat: vulnerable. Criteria: 2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poeciliopsis fasciata (Meek, 1904) Fr, Br endemic  San Jeronimo livebearer (English), Guatopote de San Jerónimo (Spanish)  5.10 cm SL male/unsexed  Found in Laguna Coyuca near Acapulco, Guerrero as far as the Rio Pijijiapan in Chiapas and Rio Coatzalcoalcos in Oaxaca. 
Poeciliidae Poeciliopsis gracilis (Heckel, 1848) Fr native  Porthole livebearer (English), Guatopote jarocho (Spanish)  9.00 cm TL male/unsexed   
Poeciliidae Poeciliopsis hnilickai Meyer & Vogel, 1981 Fr endemic  Upper Grijalva livebearer (English), Guatopote de Ixtapa (Spanish)  3.50 cm TL male/unsexed ;5.00 cm female  Known from the Rio de Salina in Chiapas.  No picture yet.
Poeciliidae Poeciliopsis infans (Woolman, 1894) Fr endemic  Lerma livebearer (English), Guatopote del Lerma (Spanish)  3.50 cm TL male/unsexed ;5.00 cm female  Known from Jalisco and Michoacan in Rio Grande de Santiago basin, Rio Lerma basin and Rio Ameca. Population stable in the 1990s (Ref. 27639). Collected together with Allotoca goslinei and Moxostoma mascotae at Potrero Grande, Jalisco (Ref. 58357). Also Ref. 84762.  No picture yet.
Poeciliidae Poeciliopsis jackschultzi Conway, Mateos & Vrijenhoek, 2019 Fr native   2.03 cm SL male/unsexed ;2.67 cm SL female  Type locality of Poeciliopsis jackschultzi: small spring at right side bank, Rio Concepcion drainage, La Atascosa, Sonora State (Ref. 128004).  No picture yet.
Poeciliidae Poeciliopsis latidens (Garman, 1895) Fr, Br, Thr endemic  Lowland livebearer (English), Guatopote del Fuerte (Spanish)  5.00 cm TL male/unsexed ;5.00 cm female  Known from the Rio del Fuerte to San Blas in Nayarit (Ref. 26130). Status of threat: threatened. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poeciliopsis lucida Miller, 1960 Fr endemic  Clearfin livebearer (English), Guatopote del Mocorito (Spanish)  3.00 cm TL male/unsexed ;5.00 cm female  Known from the Rio Mocorito basin and Rio del Fuerte on the Gulf of California in Sinaloa (Ref. 26130). Also Ref. 50313.  No picture yet.
Poeciliidae Poeciliopsis lutzi (Meek, 1902) Fr native  Oaxaca livebearer (English), Guatopote oaxaqueño (Spanish)  3.50 cm TL male/unsexed  Type locality: Río Quiotepec at Cuicatlán, Oaxaca, Mexico (Ref. 26282).  No picture yet.
Poeciliidae Poeciliopsis monacha Miller, 1960 Fr native  Headwater livebearer (English), Guatopote del Mayo (Spanish)     No picture yet.
Poeciliidae Poeciliopsis occidentalis (Baird & Girard, 1853) Fr, Pr native  Guatopote de Sonora (Spanish), Charalito (Spanish) common (usually seen) 6.00 cm TL male/unsexed   
Poeciliidae Poeciliopsis pleurospilus (Günther, 1866) Fr native  Largespot livebearer (English), Guatopote manchote (Spanish)  5.70 cm SL male/unsexed    No picture yet.
Poeciliidae Poeciliopsis presidionis (Jordan & Culver, 1895) Fr endemic  Sinaloa livebearer (English), Guatopote de Sinaloa (Spanish)  3.50 cm TL male/unsexed ;5.00 cm female  Known from the Rio Sinaloa in Sinaloa to San Blas in Nayarit.  No picture yet.
Poeciliidae Poeciliopsis prolifica Miller, 1960 Fr, Br endemic  Blackstripe livebearer (English), Guatopote culiche (Spanish)  3.00 cm TL male/unsexed  Found in the lower courses of Rio Yaqui in Sonora and along the coast to San Blas in Nayarit.  No picture yet.
Poeciliidae Poeciliopsis scarlli Meyer, Riehl, Dawes & Dibble, 1985 Fr endemic  Michoacan livebearer (English), Guatopote michoacano (Spanish)  3.00 cm TL male/unsexed ;4.50 cm female  Found in Guerrero and Michoacan.  No picture yet.
Poeciliidae Poeciliopsis sonoriensis (Girard, 1859) Fr, Thr native    Known from the Sonora system (Ref. 81264). Status of threat: threatened; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poeciliopsis turneri Miller, 1975 Fr, Thr endemic  Blackspotted livebearer (English), Guatopote de La Huerta (English)  3.00 cm TL male/unsexed ;4.00 cm female  Known from the Rio Purificacion basin to the Rio Resolana and northeastern Cihuatlan (Ref. 26130). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Poeciliopsis turrubarensis (Meek, 1912) Fr, Br native  Barred livebearer (English), Guatopote del Pacífico (Spanish)  4.00 cm TL male/unsexed ;8.00 cm female  Found in Jalisco (Ref. 26130) and Acapulco (Ref. 36880). 
Poeciliidae Poeciliopsis viriosa Miller, 1960 Fr endemic  Chubby livebearer (English), Guatopote gordito (Spanish)  3.50 cm TL male/unsexed ;6.50 cm female  Found in the Rio Ameca basn in Jalisco and south Nayarit to the Rio Mocorito in Sinaloa. 
Centrarchidae Pomoxis annularis Rafinesque, 1818 Fr, Br introduced   53.00 cm TL male/unsexed   
Centrarchidae Pomoxis nigromaculatus (Lesueur, 1829) Fr introduced  Black crappie (English), Mojarra negra (Spanish)  49.00 cm TL male/unsexed   
Scorpaenidae Pontinus rathbuni Goode & Bean, 1896 Fr native   33.40 cm TL male/unsexed   
Ariidae Potamarius nelsoni (Evermann & Goldsborough, 1902) Fr, Thr native  Lacandon sea catfish (English), Bagre lacandón (Spanish), Bagre lacadon (Spanish)  39.00 cm SL male/unsexed  Known from the Rio Usumacinta in Montecristo, Yucatan (Ref. 6868). Also Ref. 39852. Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ariidae Potamarius usumacintae Betancur-R. & Willink, 2007 Fr, Thr native  Usumacinta sea catfish (English), Bagre del Usumacinta (Spanish)  59.50 cm SL male/unsexed  Known from the Río Usumacinta basin. Most specimens were collected from Río Lacantún (Ref. 75770). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Priapella bonita (Meek, 1904) Fr, Thr endemic  Graceful priapella (English), Guayacón bonito (Spanish), Guayacon ojiazul (Spanish)   Found in the Papaloapan system (Ref. 81264). Type locality: Río Yonto at Refugio, Veracruz (Ref. 26855). Also Ref. 3881. Status of threat: extinct; status declined since 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Poeciliidae Priapella chamulae Schartl, Meyer & Wilde, 2006 Fr native   4.80 cm SL male/unsexed  Known from the Upper río Grijalva system in the Teapa area, Tabasco and Chiapas. Type locality, arroyo 3 km NW Tapijulapa, río Tacotalpa system, Tabasco, MTD F 28717 (holotype of Priapella chamulae, 2.65 cm SL, male) (Ref. 57748). 
Poeciliidae Priapella compressa Álvarez, 1948 Fr, Thr endemic  Palenque priapella (English), Guayacón de Palenque (Spanish)  4.50 cm TL male/unsexed ;7.00 cm female  Known from the Rio Grijalva system to the lower Rio Usumacinta basin in Chiaspas. Also Ref. 26855. Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Priapella intermedia Álvarez & Carranza, 1952 Fr endemic  Isthmian priapella (English), Guayacón de Chimalapa (Spanish)  5.00 cm TL male/unsexed  Found in torrential waters of the Rio dos Semillas, northwest of Paso Real, Oaxaca. Type locality: Santa María Chimalapa, Arroyo El Zacatal, Oaxaca. 
Poeciliidae Priapella lacandonae Meyer, Schories & Schartl, 2011 Fr native   4.80 cm SL male/unsexed  Known from the río Mizola, río Tulijá basin, río Grijalva system in Chiapas (Ref. 87322).  No picture yet.
Poeciliidae Priapella olmecae Meyer & Espinosa Pérez, 1990 Fr, Thr endemic  Olmec priapella (English), Guayacón olmeca (Spanish)  5.00 cm TL male/unsexed ;7.00 cm TL female  Known from the Papaloapan ecoregion (Ref. 81264). Restricted to the small rivers Rio de la Palma and Rio Aqua Fria, and a lagoon called Escondida, Los Tuxtlas, Veracruz. Also Ref. 26855. Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Ictaluridae Prietella lundbergi Walsh & Gilbert, 1995 Fr, Thr endemic  Phantom blindcat (English), Bagre ciego duende (Spanish)  4.52 cm SL female  Type locality: Subsurface thermal spring, Nacimiento de San Rafael de Los Castros, R. Tamesí drainage, Tamaulipas state. Status of threat: endangered. Criteria: 1 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Ictaluridae Prietella phreatophila Carranza, 1954 Fr, Thr endemic  Mexican blindcat (English), Bagre ciego de Múzquiz (Spanish), Bagre de Muzquiz (Spanish) scarce (very unlikely)  Type locality: Well at base of Sierra de Santa Rosa, Muzquiz, Coahuila, Mexico. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Pristidae Pristis pectinata Latham, 1794 Fr, Br, M native  Pez sierra peine (Spanish)  760 cm TL male/unsexed  Recorded from the Gulf of Mexican drainages (Ref. 57708). 
Profundulidae Profundulus mixtlanensis Ornelas-García, Martínez-Ramírez & Doadrio, 2015 Fr native   6.69 cm SL male/unsexed  Known from springs of the Pacific slope of the Mixteca region of Oaxaca in the following river systems: Colorado River, Atoyaquillo River, the Atoyac river basin, and the Mixteco river basin (Ref. 106146). 
Profundulidae Profundulus oaxacae (Meek, 1902) Fr native  Oaxaca killifish (English), Escamudo oaxaqueño (Spanish)    
Profundulidae Profundulus parentiae Matamoros, Domínguez-Cisneros, Velázquez-Velázquez & McMahan, 2018 Fr native   6.84 cm SL male/unsexed ;6.59 cm SL female  Type locality of Profundulus parentiae, State of Oaxaca, Santa Maria Huatulco, Municipality of Santa Maria Huatulco, Toma de agua Río Huatulco, on the way to the Benito Juarez community, small creek of about 20 m width with an average depth of ca.30 cm. The known distribution of this species extends from the lower reaches of the Huatulco River in the Mexican state of Oaxaca close to the city of Santa María de Huatulco to tributaries of the Grande River in the vicinity of the town of Comitlan, in Oaxaca. It was captured in a range of altitudes from 188 to 420 meters (Ref. 119416).  No picture yet.
Profundulidae Profundulus punctatus (Günther, 1866) Fr native  Brownspotted killifish (English), Escamudo pinto (Spanish)  10.00 cm TL male/unsexed   
Characidae Psalidodon fasciatus (Cuvier, 1819) Fr native   17.10 cm TL male/unsexed  Epigean form widely distributed in Mexico (Ref. 52994). 
Syngnathidae Pseudophallus starksii (Jordan & Culver, 1895) Fr native  Yellowbelly pipefish (English), Pez pipa de río (Spanish)  17.60 cm SL male/unsexed   
Poeciliidae Pseudoxiphophorus bimaculatus (Heckel, 1848) Fr native  Spottail killifish (English), Guatopote manchado (Spanish)  7.00 cm TL male/unsexed ;15.00 cm female 2.486 SL Known from the Rio Nautla, Rio Atoyac near Cordoba and Laguna de Catemaco in Veracruz (Ref. 26130). Also Ref. 84762. 
Poeciliidae Pseudoxiphophorus jonesii (Günther, 1874) Fr, Thr endemic  Barred killifish (English), Guatopote listado (Spanish)  9.20 cm TL male/unsexed ;6.90 cm TL female  Known from Rio Guayalejo in southern Tamaulipas to Rio Tehuacan in Pueblo (Ref. 26130). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Loricariidae Pterygoplichthys disjunctivus (Weber, 1991) Fr introduced  Plecóstoma rayado (Spanish) common (usually seen) 70.00 cm TL male/unsexed  Detected for the first time in the Mezcala River, Guerrero (Balsas Basin), in 1995. Also reported from Tecpatan, Chiapas, the surroundings of Villahermosa, Tabasco, and in the Grijalva-Usumacinta Basin (Tabasco and Chiapas). Competed with the tilapia fishery at the El Infiernillo Reservoir 
Leuciscidae Ptychocheilus lucius Girard, 1856 Fr native  Colorado pikeminnow (English), Carpa gigante del Colorado (Spanish)  180 cm TL male/unsexed  Known from the Colorado River drainage (Ref. 5723, 86798). 
Cyprinidae Puntius titteya Deraniyagala, 1929 Fr introduced   5.00 cm TL male/unsexed   
Ictaluridae Pylodictis olivaris (Rafinesque, 1818) Fr native  Flathead catfish (English), Bagre piltonte (Spanish), Pintontle (Spanish)  155 cm TL male/unsexed   
Heptapteridae Rhamdia guatemalensis (Günther, 1864) Fr native  Pale catfish (English), Juil descolorido (Spanish)  25.10 cm SL male/unsexed    No picture yet.
Heptapteridae Rhamdia laluchensis Weber, Allegrucci & Sbordoni, 2003 Fr, Thr native  La Lucha blind catfish (English), Juil ciego de La Lucha (Spanish), Juil de La Lucha (Spanish)  11.95 cm SL male/unsexed  Found in subterranean watercourse in Sistema de La Lucha, Chiapas (Ref. 52912). Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Heptapteridae Rhamdia laticauda (Kner, 1858) Fr native  Oaxaca catfish (English), Rock catfish (English), Juil de Jamapa (Spanish), Juil oaxaqueño (Spanish)  29.40 cm SL male/unsexed  Also Ref. 6868. 
Heptapteridae Rhamdia macuspanensis Weber & Wilkens, 1998 Fr, Thr endemic  Olmec blind catfish (English), Juil ciego olmeca (Spanish)  13.80 cm SL male/unsexed  Museum: watercourse in the Grutas de Agua Blanca, Balneario de Agua Blanca at km 64.9 of the road 186 (carretera federal) from Villahermosa to Chetumal, Tabasco, ZMH 8874 (holotype of Rhamdia macuspanensis, 12.47 cm SL) (Ref. 33862). Also Ref. 27299. Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Heptapteridae Rhamdia parryi Eigenmann & Eigenmann, 1888 Fr native  Tonalá catfish (English), Juil de Tonalá (Spanish)   Type locality: Río Zanaleneo, near Tonala, Chiapas, Mexico (Ref. 26282, 6868). Also Ref. 58032.  No picture yet.
Heptapteridae Rhamdia quelen (Quoy & Gaimard, 1824) Fr native   61.00 cm TL male/unsexed  Occurs in the Yucatan and Oaxaca region in Mexico (Ref. 26282). 
Heptapteridae Rhamdia reddelli Miller, 1984 Fr, Thr endemic  Blind whiskered catfish (English), Juil ciego (Spanish), Juil ciego de Zongolica (Spanish), Juil ciego (Spanish)   Known from Oaxaca, Acatian. Also Ref. 3881. Status of threat: threatened; status same as 1989. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Heptapteridae Rhamdia zongolicensis Wilkens, 1993 Fr, Thr native  Zongolica catfish (English), Juil ciego de Zongolica (Spanish)   Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Rheoheros coeruleus (Stawikowski & Werner, 1987) Fr endemic   12.00 cm SL male/unsexed  Known from the upper reaches of the Usumacinta system in the Rio Misolha and Rio Shamula, the montane affluents of the Rio Tulija (Ref. 7335). Also Ref. 36377. 
Cichlidae Rheoheros lentiginosus (Steindachner, 1864) Fr native  Freckled cichlid (English), Palenque cichlid (English), Mojarra de Palenque (Spanish), Mojarra gachupina (Spanish)  25.00 cm TL male/unsexed  Known from the Grijalva and Usumacinta River drainages (Ref. 36377). Recorded from the Rio El Subin (Ref. 7335). 
Leuciscidae Rhinichthys cataractae (Valenciennes, 1842) Fr native  Longnose dace (English), Carpita rinconera (Spanish)  22.50 cm TL male/unsexed  Found in northern Mexico (Ref. 86798). Also Ref. 5723. 
Leuciscidae Rhinichthys cobitis (Girard, 1856) Fr native  Loach minnow (English), Carpita locha (Spanish)  6.00 cm TL male/unsexed  Found in northern Sonora (Ref. 86798). Also Ref. 5723. 
Leuciscidae Rhinichthys osculus (Girard, 1856) Fr native  Speckled dace (English), Carpita pinta (Spanish)  11.00 cm TL male/unsexed  Found in Sonora (Ref. 86798). Also Ref. 3881, 5723. 
Haemulidae Rhonciscus bayanus (Jordan & Evermann, 1898) Fr native  Purplemouth grunt (English), Ronchado boquimorada (Spanish), Ronco blanquillo (Spanish)  51.00 cm TL male/unsexed   
Cichlidae Rocio gemmata Contreras-Balderas & Schmitter-Soto, 2007 Fr, Thr endemic  Mojarra de Leona Vicario (Spanish)  7.00 cm SL male/unsexed  Endemic to cenotes and small inland lakes in northern Quintana Roo, eastern Yucatan Peninsula (Ref. 74403). Type locality, unnamed cenote 12 km N of Leona Vicario, Quintana Roo, ECOCH 4054 (holotype of Rocio gemmata, 6.4 cm SL) (Ref. 74403). Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Rocio ocotal Schmitter-Soto, 2007 Fr, Thr endemic  Mojarra del Ocotal (Spanish)  9.60 cm SL male/unsexed  Probably endemic to Laguna Ocotal, acantún-Usumacinta drainage, Chiapas (a rather isolated, highland water body) (Ref. 74403). Type locality, Laguna Ocotal, 'Lacandona region,' Chiapas, UMMZ 245583 (holotype of Rocio ocotal, 7.0 cm SL) (Ref. 74403). Status of threat: threatened. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Cichlidae Rocio octofasciata (Regan, 1903) Fr native  Mojarra castarrica (Spanish), Riquiraqui (Spanish)  25.00 cm TL male/unsexed  Type locality, 'Río de Sarabia' (Cosamaloapan, original label), Coatzacoalcos drainage, Veracruz, MHNG 665.55 (holotype of Heros cyanoguttatus, 3.9 cm SL) (Ref. 74403). Also Ref. 1739, 4537, 75154. 
Characidae Roeboides bouchellei Fowler, 1923 Fr native  Crystal tetra (English), Sardinita cristal (Spanish)  8.20 cm SL male/unsexed  Also Ref. 36811. 
Salmonidae Salvelinus fontinalis (Mitchill, 1814) Fr introduced  Trucha de arroyo (Spanish)  86.00 cm SL male/unsexed   
Gobiidae Sicydium fayae Brock, 1942 Fr, Br, M native      No picture yet.
Gobiidae Sicydium gymnogaster Ogilvie-Grant, 1884 Fr native  Smoothbelly goby (English), Dormilón de Veracruz (Spanish)     No picture yet.
Gobiidae Sicydium multipunctatum Regan, 1906 Fr, Fi native  Multispotted goby (English), Dormilón pecoso (Spanish) occasional (usually not seen)  Ayuquila River, below Autlán Valley (Ref. 27639). Also Ref. 50190.  No picture yet.
Goodeidae Skiffia bilineata (Bean, 1887) Fr, Or, Thr endemic  Twoline skiffia (English), Tiro de dos rayas (Spanish)  4.00 cm TL male/unsexed ;6.00 cm TL female  Found in Rio Grande de Santiago, Nayarit. Abundance declining, threatened in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Skiffia francesae Kingston, 1978 Fr, Thr endemic  Golden skiffia (English), Tiro dorado (Spanish), Tiro (Spanish)  5.00 cm TL male/unsexed ;5.00 cm TL female  Type locality, Type locality, Río Teuchitlán, below and just east of Teuchitlán, near road between Hwy 70 (Ameca to Guadalajara) and Etzatlán, Jalisco (Ref. 29410). The release of the domestically bred platies resulted to its extinction in its natural habitat. Also Ref. 26130, 3881. Status of threat: extirpated in nature. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Skiffia lermae Meek, 1902 Fr, Br, Thr endemic  Olive skiffia (English), Tiro olivo (Spanish)  5.00 cm TL male/unsexed ;5.50 cm female 2.52 SL Restricted to the Lake Patzcuara, Celaya, Michoacan. This lake has no outlet and the water is slightly brackish. Range contracting, threatened in the 1990s (Ref. 27639). Also Ref. 84762. Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Skiffia multipunctata (Pellegrin, 1901) Fr, Thr endemic  Splotched skiffia (English), Tiro pintado (Spanish)  5.00 cm TL male/unsexed ;6.00 cm TL female  Found in Lerma River basin. Range contracting in the 1990s (Ref. 27639). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Belonidae Strongylura exilis (Girard, 1854) Fr, Br, M native  Agujón californiano (Spanish), Agujón bravo de California (Spanish)  91.00 cm TL male/unsexed  Ranges from the western coast of Baja California and the southern Gulf of California southward (Ref. 9279). 
Belonidae Strongylura hubbsi Collette, 1974 Fr native  Maya needlefish (English), Agujón maya (Spanish)  49.80 cm SL male/unsexed  Also Ref. 50279. 
Belonidae Strongylura marina (Walbaum, 1792) Fr, Br, M native  Atlantic needlefish (English), Agujón verde (Spanish)  111 cm TL male/unsexed  Recorded from Celestún Biosphere Reserve, Yucatan (Ref. 74908). 
Leuciscidae Stypodon signifer Garman, 1881 Fr, Thr endemic  Stumptooth minnow (English), Carpa de Parras (Spanish)   Formerly found in the Parras Valley and it is now extinct (Ref. 32716). Also Ref. 3881. Status of threat: extinct. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Synbranchidae Synbranchus marmoratus Bloch, 1795 Fr, Br native  Mottled swamp eel (English), Anguila de lodo (Spanish)  150 cm TL male/unsexed   
Cyprinidae Systomus pleurotaenia (Bleeker, 1863) Fr, Or introduced   16.00 cm TL male/unsexed  Aquarium trade.  
Leuciscidae Tampichthys catostomops (Hubbs & Miller, 1977) Fr native  Pánuco minnow (English), Carpa de Tamasopo (Spanish)   Type locality: Río Tamasopo, 9 mi. north of Tamasopo, state of San Luis Potosí, Mexico, elev. 1512 ft.  No picture yet.
Leuciscidae Tampichthys dichroma (Hubbs & Miller, 1977) Fr, Thr endemic  Bicolor minnow (English), Carpa bicolor (Spanish), Sardinita de Rio Verde (Spanish)   Known from Pánuco (Ref. 81264). Status of threat: endangered; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Tampichthys erimyzonops (Hubbs & Miller, 1974) Fr native  Chubsucker minnow (English), Carpa del Mante (Spanish)   Type locality: Canal from Río Tamesi, near Ciudad Mante, Tamaulipas (Ref. 33021).  No picture yet.
Leuciscidae Tampichthys ipni (Álvarez & Navarro, 1953) Fr endemic  Lantern minnow (English), Carpa veracruzana (Spanish)  9.00 cm TL male/unsexed  Type locality: Barranca de Venados, .5 km below Puente Venado, Río de Metztitlán, state of Hidalgo. South of the Río Pánuco in five coastal rivers Tuxpan, Cazones, Tecolutla, Nautla and Misantla rivers) of the eastern stretch of the Trans-Mexican Volcanic Belt (TMB) at 20°N (Ref. 80389).  No picture yet.
Leuciscidae Tampichthys mandibularis (Contreras-Balderas & Verduzco-Martínez, 1977) Fr, Thr endemic  Flatjaw minnow (English), Carpa quijarona (Spanish), Sardinita quijarrona (Spanish)  5.20 cm SL male/unsexed  Known from Pánuco (Ref. 81264). Status of threat: endangered; status same as 1989 listing. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Leuciscidae Tampichthys rasconis (Jordan & Snyder, 1899) Fr, Thr native  Blackstripe minnow (English), Carpa potosina (Spanish)   Known from Pánuco (Ref. 81264). Type locality: Río Verde [Rio Ojo Frio] near Rascon, Río de las Balsas system, San Luis Potosí (Ref. 33021). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Petromyzontidae Tetrapleurodon geminis Álvarez, 1966 Fr, Thr endemic  Jacona lamprey (English), Lamprea de Jacona (Spanish)  14.30 cm TL male/unsexed  Endemic to the Lerma River basin, population stable but endangered (Ref. 27639). Type locality: R. Celio at Jacona, Michoacán (Ref. 12268, 89241). Also, Duero River (Michoacán State) (Ref. 89241). Status of threat: threatened. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Petromyzontidae Tetrapleurodon spadiceus (Bean, 1887) Fr, Thr endemic  Chapala lamprey (English), Lamprea de Chapala (Spanish)  31.00 cm TL male/unsexed  Type locality: Guanajuato. Rare in Lake Chapala. Endemic to the Rio Lerma basin, abundance declining, endangered (Ref. 27639). Celio River, at Jacona and Duero River, at Zamora (Michoacán State), Lerma River and Lake Chapala (Jalisco and Michoacán states). All these drain into the Pacific Ocean through the Santiago River (Ref. 89241). Status of threat: endangered. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Theraps irregularis Günther, 1862 Fr native  Arroyo cichlid (English), Canchay (Spanish)  19.00 cm SL male/unsexed  Found in the upper reaches of the Grijalva basin in the Rio Santa Cruz. 
Cichlidae Thorichthys aureus (Günther, 1862) Fr misidentification   15.00 cm SL male/unsexed  Reported to occur in this country (Ref. 5215). Occurrence in the country is not confirmed (Ref. 7335, 36377). 
Cichlidae Thorichthys callolepis (Regan, 1904) Fr, Thr endemic  San Domingo cichlid (English), Mojarra de San Domingo (Spanish)  14.00 cm SL male/unsexed  Restricted to the upper tributaries of the Rio Coatzacoalcos, Oaxaca (Ref. 7335). Also Ref. 36377. Status of threat: vulnerable. Criteria: 5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Thorichthys helleri (Steindachner, 1864) Fr endemic  Yellow cichlid (English), Mojarra amarilla (Spanish)  14.50 cm SL male/unsexed  Known from the Coatzacoalcos River to the Usumacinta River drainage (Ref. 36377). Also Ref. 7335. 
Cichlidae Thorichthys maculipinnis (Steindachner, 1864) Fr endemic  Chescla (Spanish), Spotcheek cichlid (Spanish)  15.00 cm SL male/unsexed  Known from the Rio Papaloapan system to the Rio Coatzacoalcos system. 
Cichlidae Thorichthys meeki Brind, 1918 Fr native  Mojarra boca de fuego (Spanish), Castarrica (Spanish), Rojita (Spanish) common (usually seen) 17.00 cm TL male/unsexed  Recorded from Rio Champoton, and Lago de Ilusiones. Also Ref. 1739, 7335, 12251. 
Cichlidae Thorichthys panchovillai Del Moral-Flores, López-Segovia & Hernández-Arellano, 2017 Fr native   9.90 cm SL male/unsexed ;6.51 cm SL female  Type locality of Thorichthys panchovillai, Río Almoloya, cerca del poblado de Guivisia, cuenca superior del Río Coatzacoalcos, Oaxaca (Ref. 117866).  No picture yet.
Cichlidae Thorichthys pasionis (Rivas, 1962) Fr native  Blackgullet cichlid (English), Mojarra de La Pasión (Spanish), Mojarra amarilla (Spanish)  17.00 cm SL male/unsexed  Widespread throughout the Rio Usumacinta system. 
Cichlidae Thorichthys socolofi (Miller & Taylor, 1984) Fr, Thr endemic  Chiapas cichlid (English), Mojarra del Misalá (Spanish)  7.90 cm SL male/unsexed  Found in the Grijalva River basin (Ref. 36377). Known from the tributaries of the upper reaches of the Rio Tulija of the Rio Usumacinta system. Recorded from the Rio Mi-sol-ha (Ref. 7335). Museum: Río Misalá, trib. to Río Tulija of Río Grijalva basin, Chiapas, Mexico, elev. below 300 m, UMMZ 210819 (Ref. 33458). Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Profundulidae Tlaloc candalarius (Hubbs, 1924) Fr native  Headwater killifish (English), Escamudo de Comitán (Spanish)  8.00 cm TL male/unsexed   
Profundulidae Tlaloc hildebrandi (Miller, 1950) Fr, Thr endemic  Escamudo de San Cristóbal (Spanish)  8.00 cm TL male/unsexed  Found in the valley of San Cristóbal de las Casas in Chiapas (Ref. 27139). Status of threat: endangered. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Profundulidae Tlaloc labialis (Günther, 1866) Fr native  Largelip killifish (English), Escamudo bocón (Spanish)  11.50 cm TL male/unsexed   
Cichlidae Trichromis salvini (Günther, 1862) Fr native  Yellowbelly cichlid (English), Guapote tricolor (Spanish), Pico de gallo (Spanish), Azulita (Spanish), Cielito-lindo (Spanish), Cola de fuego (Spanish), Mango pinto (Spanish), Peine (Spanish), Riqui-raqui (Spanish)  22.00 cm SL male/unsexed  Found in the Rio Papaloapan and the Lago de Ilusiones. Also Ref. 1739. 
Dinematichthyidae Typhliasina pearsei (Hubbs, 1938) Fr, Thr endemic  Mexican blind brotula (English), Dama blanca ciega (Spanish), Dama Ciega Blanca (Spanish) occasional (usually not seen) 9.70 cm SL male/unsexed ;8.90 cm SL female  Occurs in the Yucatan Peninsula (Ref. 34024). Type locality, pool in Balaam Canche Cave near Chichen Itza, Yucatán (Ref. 33021). Also Ref. 3881, 27299, 79893. Status of threat: endangered; status same as 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Vieja bifasciata (Steindachner, 1864) Fr native  Twoband cichlid (English), Mojarra panza colorada (Spanish), Colorada (Spanish)  30.00 cm SL male/unsexed  Known from Rio Usumacinta basin. 
Cichlidae Vieja breidohri (Werner & Stawikowski, 1987) Fr endemic  Angostura cichlid (English), Mojarra de Angostura (Spanish)  16.80 cm SL male/unsexed  Found in the Grijalva River basin (Ref. 36377). Recorded from the Presa de la Angostura tributaries (Ref. 7335). Also Ref. 12251. 
Cichlidae Vieja fenestrata (Günther, 1860) Fr endemic  Blackstripe cichlid (Spanish), Mojarra del La Lana (Spanish), Mojarra negra (Spanish), Testa colorada (Spanish)  25.00 cm SL male/unsexed  Known from the Papaloapán River to the Chachalacas River basin (Ref. 36377). Also Ref. 7335. 
Cichlidae Vieja guttulata (Günther, 1864) Fr misidentification  Amatitlan cichlid (English), Mojarra de Amatitlán (Spanish)  30.00 cm TL male/unsexed  Recorded from Rio Chicapa and Rio Tehuantepec in Oaxaca (Ref. 7335). Occurrence in the country is not confirmed (Ref. 36377). 
Cichlidae Vieja hartwegi (Taylor & Miller, 1980) Fr, Thr endemic  Tailbar cichlid (English), Mojarra del Río Grande de Chiapa (Spanish)  20.00 cm SL male/unsexed  Known from the Grijalva River basin (Ref. 36377). Restricted to the Rio Grande de Chiapa and its tributaries including the Presa de Angostura (Ref. 7335). Status of threat: vulnerable. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Cichlidae Vieja melanurus (Günther, 1862) Fr native  Redhead cichlid (English), Mojarra paleta (Spanish)  35.00 cm TL male/unsexed  Restricted to the Rio Usumacinta basin. Also Ref. 4537. 
Cichlidae Vieja zonata (Meek, 1905) Fr endemic  Oaxaca cichlid (English), Mojarra oaxaqueña (Spanish), Mojarra prieta (Spanish)  25.00 cm TL male/unsexed  Known from the Tehuantepec River basin (Ref. 36377). Reported to be restricted to the Rio Coatzacoalcos basin in the Rio Jaltepec to the Rio Grijalva basin in the Rio Teapa (Ref. 7335). 
Cichlidae Wajpamheros nourissati (Allgayer, 1989) Fr native  Bluemouth cichlid (English), Mojarra labios gruesos (Spanish), Panza negra (Spanish)  22.00 cm TL male/unsexed  Type locality of Theraps nourissati, petite rivière à 1 km avant le village, La Pera” sur la route de Palenque vers Ojo de Agua, Chiapas (Mexique), MNHN 1989-583 (Ref. 114771). Known from the Usumacinta River basin (Ref. 36377). 
Goodeidae Xenoophorus captivus (Hubbs, 1924) Fr, Thr endemic  Relict splitfin (English), Mexcalpique aislado del Pánuco (Spanish), Mexcalpique aislado del Santa María (Spanish), Mexcalpique viejo (Spanish), Solo Goodeido (Spanish)  5.00 cm TL male/unsexed ;6.00 cm TL female  Found in the upper course of the Rio Penuco, near Jesus Maria del Rio, San Luis Potosi. Also Ref. 3881, 4537. Status of threat: 1). Xenoophorus captivus captivus: endangered; status declined since 1989. Criteria: 1,2,5; 2). Xenoophorus captivus erro: endangered. Criteria: 1,5; 3). Xenoophorus captivus exsul: endangered. Criteria: 1,2,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Xenotaenia resolanae Turner, 1946 Fr, Thr endemic  Leopard splitfin (English), Mexcalpique leopardo (Spanish)  4.00 cm TL male/unsexed ;5.00 cm TL female  Restricted to the Purificación and Marabasco river basins, on the Pacific slope of west-central Mexico. Status of threat: vulnerable. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Xenotoca doadrioi Domínguez-Domínguez, Bernal-Zuñiga & Piller, 2016 Fr, Thr native   3.70 cm SL male/unsexed ;4.70 cm SL female  Found only in the endorheic region of Etzatlan in the state of Jalisco. Recommended to be considered a species in danger of extinction due to irrigation pressure for agriculture and impact of introduced species (Ref. 117630).  No picture yet.
Goodeidae Xenotoca eiseni (Rutter, 1896) Fr, Or, Thr endemic  Redtail splitfin (English), Mexcalpique cola roja (Spanish)  6.00 cm TL male/unsexed ;7.00 cm TL female  Found in Nayarit, Jalisco (Ref. 4537). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Xenotoca lyonsi Domínguez-Domínguez, Bernal-Zuñiga & Piller, 2016 Fr, Thr native   5.50 cm SL male/unsexed ;5.00 cm SL female  Known only from the middle and upper part of the Coahuayana River drainage. Recorded only from the Tuxpan and Tamazula rivers at altitudes more than 1000 meters above the sea level, state of Jalisco. Recommended to be considered as endangared species due to habitat modifications for agricultural purposes with sugar cane plantations demanding high water resources and discharging polluted water from the production process, and pollution from untreated urban waste water (Ref. 117630).  No picture yet.
Goodeidae Xenotoca melanosoma Fitzsimons, 1972 Fr, Thr endemic  Black splitfin (English), Mexcalpique negro (Spanish)  8.00 cm TL male/unsexed  Found in Jalisco (Ref. 4537). Status of threat: threatened. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Xenotoca variata (Bean, 1887) Fr, Or endemic  Jeweled splitfin (English), Pintada (Spanish)  6.00 cm TL male/unsexed ;7.00 cm TL female 3.67 SL Found in the central highlands. Population stable in the 1990s (Ref. 27639). Also 4537, 84762. 
Poeciliidae Xiphophorus alvarezi Rosen, 1960 Fr native  Chiapas swordtail (English), Espada de Comitán (Spanish)  7.50 cm female  Found in the Rio Palenque in Chiapas (Ref. 26130); also in Rio Dolores (Ref. 42936). 
Poeciliidae Xiphophorus andersi Meyer & Schartl, 1980 Fr endemic  Spiketail platyfish (English), Espada del Atoyac (Spanish)  4.50 cm TL male/unsexed ;5.50 cm female  Found only in the Rio Atoyac near Chico in Veracruz, where it probably represents a small residual population. Seems to be extinct.  No picture yet.
Poeciliidae Xiphophorus birchmanni Lechner & Radda, 1987 Fr endemic  Sheepshead swordtail (English), Espada del Tempoal (Spanish)  7.00 cm TL male/unsexed ;7.00 cm female  Known from Rio Talol and Rio Tuxpan in Rio Tempoal system in Rio Panuco basin, Hidalgo.  No picture yet.
Poeciliidae Xiphophorus clemenciae Álvarez, 1959 Fr, Thr endemic  Coatzacoalcos swordtail (English), Espada de Clemencia (Spanish), Espada de Clemencia (Spanish) common (usually seen) 5.06 cm SL male/unsexed  Known from the Coatzacoalcos and Papaloapan ecoregions (Ref. 81264). Found in Oaxaca, Rio Sarabia (Ref. 42936). Reported widespread and abundant, but restricted to the uplands of the Rio Coatzacolacos basin (Ref. 52914). Status of threat: threatened; status declined since 1989. Criteria: 1,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus continens Rauchenberger, Kallman & Morizot, 1990 Fr endemic  Short-sword platyfish (English), Espada de Quince (Spanish)  2.50 cm TL male/unsexed ;3.50 cm female  Known from the Rio Ojo Frio and Rio Gallinas of the Rio Panuco drainage in San Luis Potosi.  No picture yet.
Poeciliidae Xiphophorus cortezi Rosen, 1960 Fr endemic  Delicate swordtail (English), Espada fina (Spanish)  5.00 cm TL male/unsexed ;5.50 cm female  Known from the Rio Moctezuma/Rio Axtla subsystem of the Rio Panuco basin in Hidalgo and San Luis Potosi. 
Poeciliidae Xiphophorus couchianus (Girard, 1859) Fr, Thr endemic  Espada de Monterrey (Spanish)  4.00 cm TL male/unsexed ;6.00 cm TL female  Known from the Río San Juan ecoregion (Ref. 81264). Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus evelynae Rosen, 1960 Fr endemic  Reticulate platyfish (English), Espada del Necaxa (Spanish)  4.00 cm TL male/unsexed ;6.00 cm TL female  Found in Tecolutla (Necaxa) River system.  
Poeciliidae Xiphophorus gordoni Miller & Minckley, 1963 Fr, Thr endemic  Cuatro Cienegas platyfish (English), Espada de Cuatro Ciénegas (Spanish), Platy Cuatro Cienegas (Spanish)  3.50 cm TL male/unsexed ;4.00 cm TL female  Found in Cuatro Ciénegas basin. Also Ref. 3881, 4537. Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus hellerii Heckel, 1848 Fr, Br native  Green swordtail (English), Cola de espada (Spanish)  14.00 cm TL male/unsexed ;16.00 cm TL female  Found in the following localities: Veracruz in Rio Blanco, Rio San Juan, Laguna de Catemaco, Rio Sontecomapan, Yucatan Peninsula, Rio Nautla, Rio Atoyac and Rio Playa Vicente; Oaxaca in Rio dos Semillas and Rio del Reyon. Recorded from the Balsas river basin (Ref. 58351). Introduced and established in the Lerma River basin (Ref. 27639). Also Ref. 33390, 42936. 
Poeciliidae Xiphophorus kallmani Meyer & Schartl, 2003 Fr, Thr native  Espada de Catemaco (Spanish)   Known from the Papaloapan ecoregion (Ref. 81264). Type locality, estuary zone of a small brook, 1.5 km north of Ojoxapan, Lake Catemaco, Veracruz (Ref. 56787). Status of threat: vulnerable. Criteria: 4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus kosszanderi Meyer & Wischnath, 1981 Fr native    Type locality: Arroyo Chapultepec, 7 km northeast of Monterrey, Nuevo León, Mexico.  No picture yet.
Poeciliidae Xiphophorus maculatus (Günther, 1866) Fr native  Southern platyfish (English), Espada sureña (Spanish) occasional (usually not seen) 4.00 cm TL male/unsexed ;6.00 cm TL female  Also Ref. 33390, 129076. 
Poeciliidae Xiphophorus malinche Rauchenberger, Kallman & Morizot, 1990 Fr endemic  Highland swordtail (English), Espada de Malinche (Spanish)  5.50 cm TL male/unsexed ;5.50 cm female  Known from the Rio Claro, Rio Calnali and Rio Conzintla, as well as the Arroyo Soyatla of the Atlapexo and Rio Calabozo drainage of the Rio Panuco basin in Hidalgo.  No picture yet.
Poeciliidae Xiphophorus meyeri Schartl & Schröder, 1988 Fr, Thr native  Marbled swordtail (English), Espada de Múzquiz (Spanish), Platy de Muzquiz (Spanish)  3.00 cm TL male/unsexed ;4.00 cm TL female  Known from the Río Salado ecoregion (Ref. 81264). Also Ref. 3881. Status of threat: endangered; status same as 1989. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus milleri Rosen, 1960 Fr, Br, Thr endemic  Catemaco platyfish (English), Espada de Catemaco (Spanish)  3.00 cm TL male/unsexed ;4.50 cm female  Occurs only in Catemaco, Veracruz (Ref. 26130). Known from the Papaloapan ecoregion (Ref. 81264). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Poeciliidae Xiphophorus mixei Kallman, Walter, Morizot & Kazianis, 2004 Fr native  Mixe swordtail (English)  3.90 cm SL male/unsexed  Type locality, tributary to the Rio Cuchara, Rio Aguacatengo drainage, Oaxaca, UANL 15253 (holotype of Xiphophorus mixei, 3.9 cm SL, 6 mm sword, male). Inhabits the headwaters of Rio del Sol, Rio Sarabia system and tributaries to rio Aguacatengco (Rio Jaltepec drainage) west of Platanillo, Oaxaca, Mexico, Rio Coatzacoalcos basin (Ref. 52914).  No picture yet.
Poeciliidae Xiphophorus montezumae Jordan & Snyder, 1899 Fr endemic  Montezuma swordtail (English), Espada de Moctezuma (Spanish)  5.50 cm TL male/unsexed ;6.50 cm TL female  Found in Tamaulipas, northern Veracruz, San Luis Potosí.  
Poeciliidae Xiphophorus monticolus Kallman, Walter, Morizot & Kazianis, 2004 Fr native  Southern mountain swordtail (English)  5.00 cm SL male/unsexed ;6.40 cm SL female  Type locality, Rio Cahuitepec, upper Rio del Sol, Rio Coatzacoalcos basin, Oaxaca (UNAL 15256, holotype of X. monticolus). Known from Upper Rio del Sol (Rio Sarabia drainage); upper Rio Aguacatengo near Loma Santa Cruz and Rio San Miguel (Rio Jaltepec drainage); all in Rio Coatzacoalcos basin, Oaxaca, Mexico (Ref. 52914).  No picture yet.
Poeciliidae Xiphophorus multilineatus Rauchenberger, Kallman & Morizot, 1990 Fr endemic   4.50 cm TL male/unsexed ;5.00 cm female  Found in the Rio Coy of the Rio Panuco basin in San Luis Potosi.  No picture yet.
Poeciliidae Xiphophorus nezahualcoyotl Rauchenberger, Kallman & Morizot, 1990 Fr endemic  Mountain swordatail (English), Espada montañes (Spanish)  5.00 cm TL male/unsexed ;6.00 cm female  Found in the Rio el Salto, Rio Tanchachin, Rio los Gatos and adjoining creeks of the Rio Tamasi drainage in San Luis Potosi. 
Poeciliidae Xiphophorus nigrensis Rosen, 1960 Fr endemic  Panuco swordtail (English), Espada pigmea El Abra (Spanish)  6.00 cm TL male/unsexed ;6.00 cm female  Known from the Rio Choy in the Rio Panuco basin in San Luis Potosi. 
Poeciliidae Xiphophorus pygmaeus Hubbs & Gordon, 1943 Fr endemic  Pygmy swordtail (English), Espada pigmea delgada (Spanish)  4.00 cm TL male/unsexed  Found in Pánuco River system.  
Poeciliidae Xiphophorus roseni Meyer & Wischnath, 1981 Fr native    Type locality, Arroyo Cahpultepec, 7 km northeast of Monterrey, Nuevo León (Ref. 50838).  No picture yet.
Poeciliidae Xiphophorus variatus (Meek, 1904) Fr native  Variable platyfish (English), Espada de Valles (Spanish) occasional (usually not seen) 7.00 cm TL male/unsexed   
Poeciliidae Xiphophorus xiphidium (Gordon, 1932) Fr endemic  Swordtail platyfish (English), Espada del Soto La Marina (Spanish)  4.00 cm TL male/unsexed ;5.00 cm female  Known from the Rio Soto La Marina system in Tamaulipas. 
Catostomidae Xyrauchen texanus (Abbott, 1860) Fr extirpated  Razorback sucker (English), Matalote jorobado (Spanish)  91.00 cm TL male/unsexed   
Leuciscidae Yuriria alta (Jordan, 1880) Fr endemic  Carpa blanca (Spanish)   Questionable stable in the Lerma River basin. Type locality: Lake Tupataro, Guanajuato. 
Leuciscidae Yuriria amatlana Domínguez-Domínguez, Pompa-Domínguez & Doadrio, 2007 Fr native  Amatlan chub (English), Carpa amatlana (Spanish)   Known from the Ameca basin in central plateau of Mexico (Ref. 82735).  No picture yet.
Leuciscidae Yuriria chapalae (Jordan & Snyder, 1899) Fr, Thr native  Chapala chub (English), Carpa de Chapala (Spanish)   Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264).  No picture yet.
Goodeidae Zoogoneticus purhepechus Domínguez-Domínguez, Pérez-Rodríguez & Doadrio, 2008 Fr native   4.10 cm SL male/unsexed ;4.14 cm SL female 2.503 SL Type locality, La Luz Spring (lower Lerma), Zamora, Michoacán, CPUM 1509 (holotype of Zoogoneticus purhepechus, 3.412 cm SL, adult male). It is widely distributed in different drainages along the occidental part of Central Mexico, in the last 5 years, a reduction in its distribution of almost 75% of the historical occurrence points has been observed. The most common alterations reported in the localities where the species has disappeared are the introduction of exotic species, water pollution and desiccation (Ref. 83562). Status of threat: This species should be considered as in danger of extinction, following the criteria and categories of the MER-Aii,Bi,Ci,Di (SEMARNAT 2002) and the International Union for the Conservation of Nature and Natural Resources IUCN A,1a,c,e (83562). 
Goodeidae Zoogoneticus quitzeoensis (Bean, 1898) Fr, Or, Thr endemic  Picote splitfin (English), Picote (Spanish)  3.50 cm TL male/unsexed ;4.50 cm TL female 2.62 SL Found in the Rio Grande de Santiago system. Population stable in the Lerma River basin in the 1990s (Ref. 27639). Also Ref. 4537, 84762. Status of threat: threatened. Criteria: 1,2,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
Goodeidae Zoogoneticus tequila Webb & Miller, 1998 Fr, Thr native  Tequila splitfin (English), Picote tequila (Spanish)  6.00 cm TL male/unsexed ;8.00 cm TL female  Type locality, Río Teuchitlán, Río Ameca drainage, at the eastern edge of Teuchitlán, Jalisco (Ref. 36807). Apparently existing only in one locality, a small pool which is under continued threat by introduced species and habitat degradation. With its very small range of occurrence and area occupancy, the total population is thought to be less than 50 mature individuals and thus assessed in March 1, 2007 as Critically Endangered. Since 1992, collection efforts were unsuccessful that it was thought this species may be extinct in the wild, however, an extremely small population was found in 2000-2001 in a very small pond where it was reported to be composed of less than 500 individuals of all ages with less than 50 individuals are adults. It was rediscovered in a very small lake in 2003. This species is reported to being maintained in captivity by aquarists in North America and Europe and it has been recommended that breeding programmes are implemented so that it can be reintroduced into the original, larger pools it previously inhabited (Ref. 117910). Status of threat: endangered. Criteria: 1,4,5 (http://fisc.er.usgs.gov/afs/) (Ref. 81264). 
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