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Relationship between length and weight was described for two gobioid fishes, red eel goby Odontamblyopus rubicundus and Ianceolate goby Pseudapocryptes elongatus, from the Bakkhali River estuary, Cox’s Bazar, Bangladesh. The estimated growth coefficient (b) was 2.734 for O. rubicundus and 2.660 for P. elongatus, which indicated hypoallometric or negative allometric growth (b < 3) for both species. The mean values of the relative condition factor (Kn) for O. rubicundus and P. elongatus were 0.992 ± 0.055 and 1.039 ± 0.127, respectively. No information regarding length-weight relationship in O. rubicundus from the Bakkhali River estuary, Bay of Bengal, had earlier been reported, and no such information is documented in FishBase.
International Journal of Fisheries and Aquatic studies
International Journal of Fisheries and Aquatic Studies 2021; 9(2): 151-157 Length weight relationship and relative condition factor of goby fish, Paracheaturichthys ocellatus (Day 1873) from the creeks of Mumbai2021 •
Length Weight Relationship of Paracheaturichthys ocellatus (Day1873) from the creeks of Mumbai was carried out from July 2010 to September 2011. The males ranged in the length of 66-182 mm and weight 1.152-54.801g while females ranged in the length 66-153mm and weight 2.209-38.383g. The juveniles ranged in the length range of 52-65mm and weight of 1.775-3-545g. The parabolic equation was W=-5.1742L 3.1041 with high correlation of 0.9961 indicating that fish increased in body weight as it grows in total length in the total population. The coefficient of regression b was 3.1041 for all fishes combined together showing a positive allometric growth. The relative condition factor for males was 1.0126, females was1.0375 and 1.0013 for juveniles. Sex wise analysis of relative condition values revealed that mean Kn values in females (1.0375) was higher than that of males (1.0126). In present study Kn values were higher in males during pre-spawning period while in females it was during post spawning period. In males higher Kn values was observed in the length group of 106-115mm while in females it was 66-75mm. Relative condition factor was never less than 1 through the period of study hence it was in good condition irrespective of feeding or reproductive condition. Introduction Length-weight relationship for fish was originally used to provide information on the condition of fish and to determine whether somatic growth was isometric or allometric [1, 2]. A mathematical representation of length-weight relationship derived from study of different sexes and sizes from a particular geographical area is a practical index of the condition of the fish [3] and is a very useful tool for the study of biology, physiology, ecology, population dynamics, fisheries assessment and general conditions of the fish [4]. According to Schneider et al [5] the length-weight regressions are useful for: a) calculating total weight of fish from length-frequency data. b) measuring changes in robustness/ health of the population (relative to past or future samples at the same place and season). c) determining the relative condition of small fish compared to large fish (from the slope of regression) d) comparing condition of this population to the state wide standards. The Condition Factor is a frequently used index for fish biology study, as it furnishes important information related to fish physiological state, based on the principle that individuals of a given length, exhibiting higher weight, are in a better condition [6]. It is studied by the method known as Fulton's condition factor or coefficient of condition also known as Ponderal Index. Anderson and Neumann [7] reported that the condition factor was a relative indicator of fish health and the degree of sustainable environments, where variations in the relative condition factor is linked to sexual maturity and the degree of nutrient supply within the environment. Parachaeturichthys ocellatus is native to Western Indian Ocean and Western Central Pacific ocean at 30 o E-80 o E and 45 o S-30 o N. It was identified by Day [8] in 1873 from the creeks of Mumbai. Mutsaddi and Bal [9] reported that P. ocellatus occurs in the muddy creeks of Colaba, Worli, Mahim, Danda, Madh, Mahul, and Thane. The present study of goby fish Parachaeturichthys ocellatus from creeks of Mumbai coast was undertaken to carry out a
Journal of Applied Ichthyology
Length-weight relationships of three Gobiidae species from the Rupsha River in southwestern Bangladesh2016 •
2009 •
Bangladesh Journal of Zoology
Fishes of Gobiidae Family, Recorded from the Rivers and Estuaries of Bangladesh: Morphometric and Meristic Studies2016 •
The length-weight relationships (LWRs) and condition factor (Kn) for three freshwater fish species of Mastacembelidae (Synbranchiformes) lies in the Khan Sahib River is presented. Fishes were collected monthly from October 2017 to September 2018 using trap and drag nets of mesh sizes between 3.5 to 10 mm. The estimated parameters of ‘a’ and ‘b’ for the freshwater eels were ranged from − 4.101 to − 4.596 and 2.625 to 2.751, respectively. The mean and standard (Mean ± SE) relative condition factor (Kn) value ranged from 0.13 ± 0.01 to 0.34 ± 0.07 for Mastacembelus armatus, 0.14 ± 0.003 to 0.33 ± 0.08 for Macrognathus siamensis and 0.16 ± 0.01 to 0.26 ± 0.02 for Macrognathus aral. This work has provided a primary data base and calls for further studies of Mastacembelidae for deriving sustainable fishery strategies.
International Journal of Fisheries and Aquatic Studies
Length- Weight relationship and relative condition factor of Peacock eel (Macrognathus aral (Bloch and Schneider, 1801) from Dora Wetland of Assam2016 •
Macrognathus aral (Bloch and Schneider, 1801) commonly known as peacock eel belongs to the family Mastacembelidae. The present study describes the length-weight relationship of the fish collected from Dora Beel. A total of 94 specimens were investigated in the study. The fishes were separated into male and female to calculate lengthweight relationship of each individual of the species. The growth performance in both male & female are found high since the correlation co-efficient ‘r’ exhibits high degree of correlation between the length-weight relationships. The correlation co-efficient ‘r’ in Macrognathus aral is closer to 1.0. The length-weight relationship showed a positive allometric growth in both sexes of this species.
Macrognathus aral (Bloch and Schneider, 1801) commonly known as peacock eel belongs to the family Mastacembelidae. The present study describes the length-weight relationship of the fish collected from Dora Beel. A total of 94 specimens were investigated in the study. The fishes were separated into male and female to calculate length-weight relationship of each individual of the species. The growth performance in both male & female are found high since the correlation coefficient 'r' exhibits high degree of correlation between the length-weight relationships. The correlation coefficient 'r' in Macrognathus aral is closer to 1.0. The length-weight relationship showed a positive allometric growth in both sexes of this species.
AACL Bioflux 6(5): 498-509. (Indexed in: SCOPUS, ISI Master List)
Length-length relationship, length-weight relationship and condition factor of freshwater fish species of BangladeshWorld Journal of Zoology
Sex Ratio, Length-Frequency Distributions and Morphometric Relationships of Length-Length and Length-Weight for Spiny Eel, Macrognathus aculeatus in the Ganges River, NW BangladeshThe present study describes the sex ratio, length-frequency distribution (LFD), length-weight relationship (LWR) and length-length relationship (LLR) of Macrognathus aculeatus wild population from the Ganges River, northwestern Bangladesh. Sampling was done using traditional fishing gears including cast net, square lift net, conical trap, monofilament fixed gill net and fish barrier during February 2011 to January 2012. For each individual, the total length (TL) and standard length (SL) were measured by digital slide calipers. Individual body weight (BW) was also taken by a digital balance. A total of 254 specimens ranging from 9.20-19.71 cm TL and 5.10-28.60 g BW were investigated in this study. The LFD showed that the 16-16.99 cm TL size group was numerically dominant. The sex ratio (male: female) was found to be 1:1.35. The overall sex ratio was significantly differed from the expected value of 1:1 (df = 1, P2 = 5.69, P<0.05). The coefficient b of the LWRs indicated negative allometric growth (b93.00) for males, females and combined gender of M. aculeatus in the Ganges River. Further, LLRs were highly correlated (r2=0.992). These results will be convenient for fishery biologists and ecologists to recommend suitable guidelines for sustainable fishery management and conservation of its numerous stocks in the Padma River and neighboring countries.
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