Thonides debarques par les pecheurs artisans dans la zone d’abidjan (Cote d’Ivoire) source potentielle d’une amelioration de la securite alimentaire

Dans le cadre des activités de suivi de la pêche artisanale maritime, une étude sur la production des thonidés débarqués a été réalisée. Elle avait pour but d’obtenir les informations indispensables à une estimation de la capture nationale de thonidés, à l’égard de la problématique de la sécuritéalimentaire. La méthodologie utilisée a consisté à collecter les données chaque jour par des techniciens des structures de recherches de 2014 à 2017, sur les sites de débarquements d’abobodoumé, de zimbabwé et du port. Les résultats obtenus indiquent une similarité dans les productions de 2014 à 2016 avec une augmentation en importante en 2017 due à l’intérêt que suscite la pêche des thonidés chez les pêcheurs. Compte tenu des prises importantes de ces espèces de poisson, une organisation rigoureuse des activités pourrait militer davantage en faveur des moyens et stratégies à mettre en oeuvre pour assurer le renforcement de la sécurité alimentaire dans ce sous-secteur de la pêche.Mots clés : Thonidés, Pêcheurs artisans, Production, Sécurité alimentaire, Côte d’Ivoire

Accuracy Assessment of the ESA CCI 20M Land Cover Map: Kenya, Gabon, Ivory Coast and South Africa

This working paper presents the overall and spatial accuracy assessment of the European Space Agency (ESA) 20 m prototype land cover map for Africa for four countries: Kenya, Gabon, Ivory Coast and South Africa. This accuracy assessment was undertaken as part of the ESA-funded CrowdVal project. The results varied from 44% (for South Africa) to 91% (for Gabon). In the case of Kenya (56% overall accuracy) and South Africa, these values are largely caused by the confusion between grassland and shrubland. However, if a weighted confusion matrix is used, which diminishes the importance of the confusion between grassland and shrubs, the overall accuracy for Kenya increases to 79% and for South Africa, 75%. The overall accuracy for Ivory Coast (47%) is a result of a highly fragmented land cover, which makes it a difficult country to map with remote sensing. The exception was Gabon with a high overall accuracy of 91%, but this can be explained by the high amount of tree cover across the country, which is a relatively easy class to map

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Not AvailableThe stock assessment of Brachydeuterus auritus was carried out in the coastal water of Ivory Coast from January to December 2009. Monthly length frequency data were analyzed using FiSAT software and Jones’ Cohort Analysis Model for the estimation of population parameters, total biomass and Maximum Sustainable Yield (MSY). The asymptotic length (L∞) was 25.20 cm, the growth coefficient (K) was 0.58 year-1, and the calculated growth performance index (φ’) was 2.57. The total mortality (Z), the fishing mortality (F) and the natural mortality (M) were 2.01, 0.74 and 1.27 year-1, respectively. The exploitation level (E) was 0.37 while the maximum allowable limit of exploitation (Emax) was 0.85. The biomass was 2507 tons, which provided the MSY of 2079 tons. The recruitment pattern was continuous with two major peaks per year. The exploitation level (E = 0.37) and the fishing mortality approximated the precautionary target reference point (0.64 year−1) and was within the precautionary limit reference point (0.84 year−1), suggesting that the big eye grunt stock is exploited at a low rate.Not Availabl