Long-term fishing impact on the Senegalese coastal demersal resources: diagnosing from stock assessment models

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Ba, Kamarel | Thiaw, Modou | Fall, Massal | Thiam, Ndiaga | Meissa, Beyah | Jouffre, Didier | Thiaw, Omar Thiom | Gascuel, Didier, D.

Edité par CCSD ; EDP Sciences -

ISI Document Delivery No.: FU9CL Times Cited: 0 Cited Reference Count: 60 Cited References: Gascuel D, 2008, Dynamique des populations et gestion des stocks halieutiques, Support de cours, Ba, Kamarel Thiaw, Modou Fall, Massal Thiam, Ndiaga Meissa, Beyah Jouffre, Didier Thiaw, Omar Thiom Gascuel, Didier Senegalese Government; European Union (10th FED) We would like to thank the editor and two anonymous reviewers for their insightful comments on the manuscript and their very useful suggestions, which significantly improved its quality. We are also grateful to ADUPES (Amenagement Durable des Pecheries du Senegal) project funded by the Senegalese Government and European Union (10th FED) which supported this work. Edp sciences s a Les ulis cedex a Fisheries; Marine & Freshwater Biology Haefer mb, 1991, bulletin of mathematical biology, v53, p253. International audience. For the first time in Senegal, assessments based on both stochastic and deterministic production models were used to draw a global diagnosis of the fishing impact on coastal demersal stocks. Based one national fisheries databases and scientific trawl surveys data: (i) trends in landings since 1971 were examined, (ii) abundance indices of 10 stocks were estimated using linear models fitted to surveys data and commercial catch per unit efforts, and (iii) stock assessments were carried out using pseudo-equilibrium Fox and Pella-Tomlinson models and a Biomass dynamic production model fitted in a Bayesian framework to abundance indices. Most stocks have seen their abundance sharply declining over time. All stocks combined, results of stock assessments suggest a 63% reduction compared to virgin state. Three fifth of demersal stocks are overexploited and excess in fishing effort was estimated until 75% for the worst case. We conclude by suggesting that the fishing of such species must be regulated and an ecosystem approach to fisheries management should be implemented in order to monitor the whole ecosystem.

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