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Croissance et exploitation de Liza dumerili (Steindachner, 1870), par l'utilisation des fréquences longueurs dans l'Aire Marine Protégée de Joal-Fadiouth au Sénégal
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Croissance et exploitation de Liza dumerili (Steindachner, 1870), par l'utilisation des fréquences longueurs dans l'Aire Marine Protégée de Joal-Fadiouth au Sénégal
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Croissance et exploitation de Liza dumerili (Steindachner, 1870), par l'utilisation des fréquences longueurs dans l'Aire Marine Protégée de Joal-Fadiouth au Sénégal
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Journal Article
Croissance et exploitation de Liza dumerili (Steindachner, 1870), par l'utilisation des fréquences longueurs dans l'Aire Marine Protégée de Joal-Fadiouth au Sénégal
2020
Overview
The determination of the growth and exploitation parameters of Liza dumerili is carried out by the length frequency analysis method. Samples are either obtained from landings from the Joal Fadiouth artisanal fishery supplemented by catches made in experimental fishing by a purse seine. The measurements included total length, total weight, eviscerated weight and gonad weight. The data were analyzed by the FISAT II software for biometric analysis which include asymptotic length and growth coefficient (K) among others. For statistical analysis we used Past software for naturalists. The results obtained showed isometric isometry with b = 3. The growth parameters estimated using the von Bertallanfy equation gave the following results for the asymmetric length L∞ = 39.55 cm and a growth coefficient k = 0.37 year-1. According to the methods used, the instantaneous mortality is Z = 2.61an-1, the fishing mortality F = 1.99 yr-1 and the natural mortality M = 0.62 yr-1. Virtual population analysis showed that L. dumerili is overexploited in the area with an exploitation rate E = 0.76. Juveniles are the most affected by fishing pressure. In the management of local fisheries, management measures specific to the species are required.
Publisher
International Journal of Innovation and Applied Studies
Subject
