Couffo basin; population dynamics; Porogobius schlegelii; stock assessment; TropFishR; Water Science and Technology
Abstract :
[en] Lake Ahémé is one of the main fishing areas in the Couffo basin. Porogobius schlegelii (Gunther, 1861) is one of the fish most exploited by artisanal fishing after the cichlid species. Sustainable management of the species requires reliable data on the current pressure of traditional fishing in order to find measures to adjust fishing activities to the recruitment capacity of the species. Therefore, from January to December 2020, data on total length, total weight and sex were collected monthly on a total of 3447 specimens of P. schlegelii caught by local fishermen. The size at first maturity (L50) determined with the statistical package sizeMat was estimated at 6.5 and 6.2 cm for males and females, respectively. The asymptotic length obtained with the TropFishR statistical package was 14.8 cm for both sexes. The growth coefficient and growth performance index were 0.87 year−1 and 2.28, respectively, with a normalised adjustment value of 0.21. Estimates of total, natural and fishing mortality were 3.55, 1.53 and 2.02 year−1, respectively. The current exploitation rate was 0.57 and as such remained above the exploitation rate at 50% of its unexploited biomass (E0,5 = 0.37). Therefore, a reduction in the current exploitation rate is required by at least 35.1% to maintain sufficient biomass. The estimated size at first capture of 5.9 cm is smaller than L50 for both sexes. These parameters clearly reflect a current trend of overexploitation. Monitoring of fishing efforts and sensitisation of fishermen to catch fish measuring at least 9.3 cm (optimal length) are among the management measures recommended to sustain the P. schlegelii fishing in Benin.
Lederoun, Djiman ; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin ; Laboratory of Functional and Evolutionary Morphology, University of Liege, Chemistry Institute B6, Liege, Belgium
Vandewalle, Pierre ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution
Houndekounnou, Boniface D.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Baglo, Imaculé S.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Lalèyè, Philippe A.; Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
Language :
English
Title :
Population Parameters and Exploitation Rate of Porogobius schlegelii (Perciformes: Gobiidae) in Lake Ahémé (Benin, West Africa)
IFS - International Foundation for Science ARES - Académie de Recherche et d'Enseignement Supérieur
Funding text :
Funding: This work was supported by Acad\u00E9mie de Recherche et d'Enseignement Sup\u00E9rieur (ARES, F\u00E9d\u00E9ration Wallonie-Bruxelles, Belgique) and International Foundation for Science (IFS) (A/5327-2). We would like to thank the fishermen of the Couffo basin for their participation in the data collection. We also thank Nourou Deen Toko (University of Abomey-Calavi, Benin) for assistance with Figure\u00A01 and Andr\u00E9 Agbogba (Agence pour le D\u00E9veloppement int\u00E9gr\u00E9 de la zone Economique du Lac Ah\u00E9m\u00E9 et ses Chenaux-ADELAC) for his assistance in the field. This study is part of a postdoctoral programme of the first author funded by the Acad\u00E9mie de Recherche et d'Enseignement Sup\u00E9rieur (ARES, Wallonia-Brussels Federation, Belgium) through its \u00C9LAN postdoctoral fellowship programme (2018) and supplemented by a research grant from the International Foundation for Science (IFS, A/5327-2) (2018-2020).This work was supported by Acad\u00E9mie de Recherche et d'Enseignement Sup\u00E9rieur (ARES, F\u00E9d\u00E9ration Wallonie\u2010Bruxelles, Belgique) and International Foundation for Science (IFS) (A/5327\u20102). Funding:We would like to thank the fishermen of the Couffo basin for their participation in the data collection. We also thank Nourou Deen Toko (University of Abomey\u2010Calavi, Benin) for assistance with Figure 1 and Andr\u00E9 Agbogba (Agence pour le D\u00E9veloppement int\u00E9gr\u00E9 de la zone Economique du Lac Ah\u00E9m\u00E9 et ses Chenaux\u2010ADELAC) for his assistance in the field. This study is part of a postdoctoral programme of the first author funded by the Acad\u00E9mie de Recherche et d'Enseignement Sup\u00E9rieur (ARES, Wallonia\u2010Brussels Federation, Belgium) through its \u00C9LAN postdoctoral fellowship programme (2018) and supplemented by a research grant from the International Foundation for Science (IFS, A/5327\u20102) (2018\u20102020).
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