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State of major tunas stock in Atlantic East center zone, off Ivory Coast

Research Paper | June 1, 2018

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Soro Yaya, Ganga JanardhananThulasi, Ouattara N’Golo, N’da Konan

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J. Bio. Env. Sci.12( 6), 112-123, June 2018


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The technologies used in fisheries became more efficient, just to meet the needs of a galloping population. That significantly affects the sustainable management of living resources, including major tunas (Thunnus albacares, Katsuwonus pelamis, Thunnus obesus). To alert international opinion on the level of exploitation of these fish species, a comparative study was carried out on the quantities of tuna landed by industrial fishery over two decades [(1975-1984) and (2004-2013)]. To achieve this, data 2014 of International Commission for the Conservation of Atlantic Tunas (ICCAT) have been used. As an index of unit of Fishing Effort, we used the number of tides. The Catch Per Unit Effort (CPUE) which provides information on repartition density of species on the fishing area was also used. Schaefer’s General Linear Model (GLM), that allows making linear transformations of several dependent variables have been developed to estimate the Maximum Sustainable Yield (MSY). This value (8464 T) provides information on the fishing effort required for sustainable management of the major tuna stock in that area. Size frequencies of those fishes were plotted as histograms by species and year, to learn more about maturity status of captured individuals. Overall, the major tunas are overexploited in that Atlantic East center zone, bordingIvory Coast. But taken individually, Thunnus albacares and Thunnus obesus are in overexploitation phase, unlike Katsuwonus pelamis which is still in full exploitation. Taking efficient protection measures would help to ensure the sustainability of these species, which would be a strong contribution to safeguarding biological diversity.


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