Evaluation of length-weight and length-length relationships of some of the most abundant commercial fishes from the Couffo River basin (Benin, West Africa)
Lederoun, Djiman; Ahouanganon, Vivien H.; Dagnide, Richard A.et al.
2022 • In Fisheries and Aquatic Life, 30 (2), p. 63 - 73
allometric growth; conservation; Couffo River; Ichthyofauna; sustainable exploitation; Aquatic Science; General Medicine
Abstract :
[en] The Couffo basin is not well known, and neither are its aquatic living resources, such as fish fauna, which are subjected to high exploitation rates. The objectives of this study were to establish length-weight ratios (LWRs) and length-length ratios (LLRs) for the most important species in the catches and those of certain economic value. A total of 12,191 specimens belonging to 40 commercial species of actinopterygian fishes were caught with several fishing gears and methods between February 2018 and March 2021. Allometric coefficient b of the LWRs (BW = a × TLb) ranged from 2.194 for Enteromius callipterus to 3.673 for Protopterus annectens with a mean of 2.902 ± 0.315. The growth of thirteen species was isometric, that of fourteen species was negatively allometric, and that of the remaining thirteen species was positively allometric. Coefficient of determination r2 for the LLRs of 39 of the 40 selected species mentioned above was significant and ranged from 0.781 in Gobionellus occidentalis to 0.997 in Elops senegalensis with a mean value of 0.951 ± 0.049. The results will be useful for further studies on assessments of population dynamics and the sustainable conservation of the already limited fish stocks in the Couffo River basin.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Lederoun, Djiman ; Université de Liège - ULiège ; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Ahouanganon, Vivien H.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Dagnide, Richard A.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Vandewalle, Pierre ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution
Lalèyè, Philippe; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Language :
English
Title :
Evaluation of length-weight and length-length relationships of some of the most abundant commercial fishes from the Couffo River basin (Benin, West Africa)
We would like to thank the fishers of the Couffo basin for their participation in data collection. We would also like to thank Nourou Deen Toko (University of Abomey-Calavi, Benin) for assistance with Figure 1 and André Agbogba (Agence pour le Développement intégré de la zone Economique du Lac Ahémé et ses Chenaux-ADELAC) for his assistance in the field. This study is part of the postdoctoral program of the first author funded by the Academy of Research and Higher Education (ARES, Wallonia-Brussels Federation, Belgium) through its ÉLAN postdoctoral fellowship program (2018), and it was also supplemented by a research grant from the International Foundation for Science (IFS, A / 5327-2) (2018–2020).
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