Population Dynamics of Mangrove Oyster, Crassostrea gasar of the Lagoons Ebrié and Aby (Côte d’Ivoire)

Jean Noel Yapi, Mélecony Célestin Ble, Assoi Olivier Etchian, Vincent Kadjo, Kouakou Yao

Abstract


(This work characterizes the population dynamics of mangrove oyster, Crassostrea gasar of two lagoons of Côte d’Ivoire: the Ebrié lagoon; on the level of Grand-Bassam and Azito and the Aby lagoon; on the level of Assinie. Thus, a monthly sampling of 30 oysters per site for 12 months (October 2015 at September 2016), for each month, the sampled oysters were grouped in size class of 10 mm and treaty with   FiSAT II software for the determination of the population dynamics parameters. Thus, the results showed that the site of Azito records the best growth coefficient (1.80 years-1). The coefficient in this locality is 2.05 and 3.10 times respectively higher than that of Grand-Bassam and Assinie.  However, the longevity of the specimens of Assinie remains higher (5.17 years) compared to that of Large-Bassam (3.47 years) and Azito (1.67 years). The individuals of the three localities record an average size of 99mm. A similar report is done concerning asymptotic length and the coefficient of growth performance. The recruitment of oysters is continuous all the year. However, of the peaks are observed on the level of each site. It appears in addition that the oysters of the lagoons Ebrié and Aby are in a situation of overexploitation.  The data of this study will make it possible to pose the bases of a rational exploitation of mangrove oysters.


Keywords


Population Dynamics; Mangrove Oyster; Crassostrea gasar; Lagoons; Côte d’Ivoire.

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References


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