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1996, Netherlands Journal of Aquatic Ecology
Fisheries Research
Breeding, growth, mortality and yield of the mudskipper Periophthalmus barbarus (Linneaus 1766) (Teleostei: Gobiidae) in the Imo River estuary, Nigeria2002 •
We studied the reproductive biology, growth, mortality, recruitment pattern and yield-per-recruit to the fishery of the mudskipper Periophthalmus barbarus (= P. papilio) in the intertidal swamps of the Imo River estuary in the south-eastern Nigeria. Monthly variation in gonadosomatic index reveals that the males spawn once in a year from February to May and the females from March to May. The size at which 50% of the specimens matured was 10.2 cm (total length) for females and 10.5 cm for males while the median size at spawning was 10.8 cm for females and 11.9 cm for males. We collected and analysed 12 consecutive months length–frequency data using FISAT software. Fitting the seasonalized von Bertalanffy growth function to these data gave the following results: total length, , C=0.9, WP=0.2 of the year. Using the seasonalized catch curve procedure, the estimated instantaneous total mortality coefficient . The instantaneous fishing mortality coefficient , and the instantaneous natural mortality coefficient . Our computed exploitation rate E=0.68 showed that fishing pressure on the stock is high. This was supported by the results of our relative yield-per-recruit analysis which showed the predicted maximum exploitation level Emax=0.51 which was lower than the current exploitation rate (E=0.68).
2018 •
The aim of this study was to evaluate the length-weight relationship and condition of mudskipper (Periophthalmus papilio) obtained in a tidal creek in the Niger Delta. Total of 120 samples were collected in twelve months with length and weight measurements carefully taken in the laboratory. The difference in weight per unit length (b) obtained from regression equations ranged from 1.95-3.5 while the condition factor (K) ranged from 1.12-1.45. Monthly values of ‘b’ and K compared well with overall ‘b’ value (2.551) and K-value (1.25) with implication of sample homogeneity. The ‘b’ values showed both positive and negative allometric growth pattern while K values indicated mudskipper samples, were in good condition. All the fish examined for each month showed a linear relationship between weight and length of mudskipper however, variation in weight for each month was observed and was significantly different (P<0.01) between the months of study. The observed differences in ‘b’ and K ...
2021 •
The mudskipper, Periophthalmus barbarus is reported to be a good delicacy for human consumption as well as for use in traditional medicinal preparations where aphrodisiac properties are attributed to its flesh. They are investigated for their biological and eco-toxicological studies, to determine its potential use as a bio-indicator in environmental assessments of coastal waters, tropical or subtropical soft bottom intertidal systems, and despite this; there is lacuna of scientific report on its biology and ecology. This research was undertaken to provide information on the aspects of the biology of the species, with reference to sexual dimorphism, sex ratio, size composition, gonad morphology and morphogenesis, length weight relationship and condition index. Monthly samples were collected at Jaja creek, Niger Delta, Nigeria and preserved in 10% formalin for further analysis. Length and weight of each specimen were measured and weighed to the nearest 0.1 cm and 0.001 g respectively;...
Lakes & Reservoirs: Research & Management
Length-weight and length-length relationships of some of the most abundant species in the fish catches of Lake Nokoué and Porto-Novo Lagoon (Benin, West Africa)2018 •
The length-weight relationships of some economic freshwater fishes were analyzed in Nwaniba River, Southern Nigeria. Fish specimens were procured from middlemen at the landing site from January to June, 2014. The mean total length and weight were 15.76 cm and 78.39g respectively. The highest (3.512) and lowest (1.503) " a " value was recorded for Hemichromis fasciatus and Oreochromis niloticus respectively, while the " b " value ranged from 2.78 and 3.54. The mean condition factor ranged from 1.818 and 2.351. The result obtained in this study showed both negative and positive allometric growth pattern. 1. Introduction Fish, especially those in tropical and subtropical water system are known to experience growth fluctuations which are due to factors such as changes in environmental parameters and food composition [27, 1, 25]. Apart from changes in these environmental characteristics, the morphometric characteristics are also used to assess growth fluctuation on fish populations. In this regard, it is common to use measurements such as body-length, body depth, head length, eye diameter, jaw length of fishes etc, to not only assess the fish habitat peculiarities and ecological criteria in water bodies, but to also measure discreteness and relationships among various taxonomic categories [19, 26]. Length and weight data of fish are useful parameters in estimating the length and age structures, population dynamic, growth, mortality rates and well-being of the fish [16, 17, 4, 22, 18]. They are also important tools used to obtain information on length frequency distribution [3, 12] , fish condition for stock assessment [28, 1] and management of the fish population [31, 7, 13]. Condition factor in fisheries is crucial as a quantitative parameter because the heavier the fish species of a given length, the better the physiological condition of the aquatic organism [6, 33]. It is also an index to understand the life-cycle of a fish by referring to the coefficient values derived from its length-weight relationship data [30]. However, the condition factor of fish is strongly affected by biotic and abiotic environmental variables [20, 29, 4]. Recent studies on the fish fauna in Nwaniba River have been conducted on species richness and diversity of lcthyofaunal and ornamental fish species by some researchers [24, 8, 32, 9] , but little or no work on the Length-weight Relationship of the fish species in the study area of Nwaniba River, hence, the need for the present study to provide information on an estimated average weight of fish species of a given length, as well as using this data to assess the relative wellbeing of some fish population in this river.
Journal of Natural Sciences Research
Mortality and Exploitation of Penaeus monodon in the Andoni River, Nigeria2013 •
The mortality and exploitation of the giant tiger prawn ( P.monodon ), an exotic shell fish species whose occurrence in Nigerian coastal waters was first reported in 1999 was investigated in the Andoni River, Nigeria from March 2012 to February, 2013. The stock was determined through data collected from artisanal fishers at Kaa water front on a monthly basis. The weight of each specimen was determined using Ohaus electronic weighing balance while length was measured with vernier caliper. FAO-ICLARM Fish Stock Assessment Tools II (soft ware) was used for data analysis. Population parameters showed that asymptotic length (L?) and growth rate (K) were 31.5cm and 0.870yr? 1 respectively. Natural mortality (M) yr -1 was equal to 1.64302 while fishing mortality (F) yr -1 was 0.38698 and total mortality (Z) yr -1 equalled 2.03. The exploitation rate was 0.1906 while the allowable limit of exploitation (E max ) was equal to 0.421. The present value of exploitation ratio (E = 0.1906) was low...
Journal of Aquaculture Research & Development
Length-Weight Relationships of Some Economic Fishes of Ibeshe Waterside, Lagos Lagoon, Nigeria2014 •
International Journal of Aquatic Biology
Demographic parameters and exploitation rate of five key fishes of Okpara Stream, Oueme River, Benin, West Africa2019 •
The current study was carried out on Okpara Stream in Northern Benin to evaluate the demographic factors with inferences on fisheries status of five dominant fish species, which were sampled monthly intervals for 18 months. Asymptotic length (L∞) ranged from 36.23 cm ( Brycinus macrolepidotus ) to 18.8 cm ( Hemichromis fasciatus ). Growth rates (K) varied between 1.6 yr -1 and 0.66 yr -1 with growth performance index (Φ’) ranging from 2.4 to 3.1. Theoretical age at length zero (t 0 ) varied -0.95 year for Marcusenius senegalensis to -0.59 year for Shilbe intermedius . Except for B. macolepidotus , total mortalities were higher than 2 year -1 and length at first capture (L 50 ) ranged 7.72-12.09 cm. Marcusenius senegalensis and S. intermedius showed one annual peak of recruitment, whereas H. fasciatus , Oreochromis niloticus and B. macrolepidotus displayed two peaks. The results indicated that the stocks of these five species were underexploited. However, the low length at first capt...
The length-weight relationship and condition factor of Tilapia zilli were analyzed in Warri River, Southern Nigeria. A total of 240 species were recorded. The mean total length and weight were 11.27 cm and 26.57 g respectively. The highest (0.248134) and lowest (0.138083) " a " value was recorded in January and February respectively, while the " b " value ranged from 5.037534 January and 7.923723 in May, 2013. The mean condition factor ranged from 2.18 in January and 7.25 in May. The result obtained in this study showed general positive allometric growth. 1. Introduction Fish such as the much sought after cichlids, plays an important role in any nations economic and development [1]. The fish food is nutritive in protein and other essential nutrients needed for the body development [2]. Length-weight relationship is an important tool for adequate exploitation and management of the population of fish species [3]. The length and weight data are a useful and standard result of fish sampling programs [1]. However, these data are required in order to estimate growth rates, length and age structures, and other components of fish population dynamics [4]. In the study of Fisheries Science, the condition factor 'K' is used in order to compare the " Condition " fatness or wellbeing of fish. The 'K' is important in understanding the life cycle of fish species and contributes to adequate management of the species, hence, maintaining the equilibrium in the ecosystem [5]. It is based on the hypothesis that heavier fish of a certain length are in better condition [6]. Condition factor (K) is strongly influenced by both biotic and abiotic environmental conditions and can be used to assess the status of the aquatic ecosystem in which fish live [3]. Fish found in tropical and subtropical water system experience frequency growth fluctuations due to factors such as food composition changes, rate of spawning to mentioned but a few [7]. The study was therefore aimed for studying the length-weight relationship and condition factor of Tilapia zilli in Warri River at Agbarho, Southern Nigeria.
Journal of Eco-friendly Agriculture
Phosphorus management in maize using PSB (Phosphorus solubilising bacteria) in VertisolSSRN Electronic Journal
Opium for the Masses? Conflict-Induced Narcotics Production in Afghanistan2009 •
Geografisk Tidsskrift-Danish Journal of Geography
Assessing the influences of service provision on pace and short and medium term development patterns of residential housing in Dar es Salaam2018 •
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CITRUS RGL (Citrus reticulata) FARMERS SATISFACTION TO THEIR MARKETING INSTITUTION SERVICES IN REJANG LEBONG DISTRICT2020 •
The Journal of Chemical Thermodynamics
Measurement and modeling the excess molar properties of binary mixtures of {[C6mim][BF4]+3-amino-1-propanol} and {[C6mim][BF4]+isobutanol}: Application of Prigogine–Flory–Patterson theory2012 •
Brazilian Journal of Medical and Biological Research
Plasticity of neutrophils reveals modulatory capacity2015 •
Proceedings of the 3rd NFE Conference on Lifelong Learning (NFE 2016)
The Role of Family toward Early Childhood Education through Module: An Approach as Part of Lifelong Learning2017 •
The Egyptian Journal of Radiology and Nuclear Medicine
The added value of diffusion-weighted MR imaging to MR cholangiopancreatography in differentiating malignant from benign extrahepatic biliary strictures2013 •
Business Management Analysis Journal (BMAJ)
Pengaruh Makro Ekonomi Dan Mikro Ekonomi Terhadap Profitabilitas Pada BPR Syariah DI Indonesia2021 •
2015 •
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Nutritionally ‘empty’ butfullof meanings: The socio-cultural significance of birthday cakes in four early childhood settings2014 •
2020 •
Industrial and Corporate Change
Understanding complex organization: the role of know-how, internal structure, and human behavior in the evolution of capabilities12006 •
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Una perspectiva del Sur sobre capital global, migración forzada y desarrollo alternativo2011 •
Revista Com Censo: Estudos Educacionais do Distrito Federal
Entre flores, borboletas e joaninhas: representações da deficiência na literatura infantil brasiliense2020 •
BMC Pregnancy and Childbirth
Study Protocol. IDUS – Instrumental delivery & ultrasound. A multi-centre randomised controlled trial of ultrasound assessment of the fetal head position versus standard care as an approach to prevent morbidity at instrumental delivery2012 •
American Journal of Computer Science and Information Technology
Assessment of the Readiness of Community Health Workers to Participate in a Mobile Training and Support Services Innovation: Results of a Functionality Assessment in Bo District, Sierra Leone 20182018 •
2016 •
Jurnal Pendidikan Ekonomi (JURKAMI)
Pengaruh Pelayanan, Kualitas Produk, Harga Dan Promosi Terhadap Keputusan Pembelian DI Toko Sneakers Room MedanJournal of Visualized Experiments
Laser Microdissection for Species-Agnostic Single-Tissue Applications2022 •