Relation Longueur-Poids Pour 15 Espèces de Poissons Exploitées dans la Lagune Ebrié, Côte d’Ivoire (Afrique de l’uest)

Abstract

The Ebrié lagoon undergoes numerous disturbances of anthropic origin manifesting since these last decennis by a massive and sudden mortality of the ichthyological populations. In order to measure the impact of these disturbances, length-weight relationship was estimated for the main ichthyologic species in the lagoon Ebrié. The specimens were collected from 457 identification, each sample was weighed to the gram and measured to average millimeter. For this study, 15 species belonging to 11 families were selected because of their presence during the sample period. The length-weight regressions were significant with a coefficient of determination (r²) ranging from 0.717 (Ethmalosa fimbriata) to 0.923 (Gerres eucinostomus). The allometry coefficient b is ranged from 2.36 for Tylochromis jentinki to 3.12 for Liza falcipinnis. The majority of the regression coefficient of the captured species (66.67%) was lower than 3. The size frequency distribution showed that 92% of the captured species are small in size with a minimum size of 30 mm for Gerres nigri and a maximum of 370 mm for Chrysichthys spp.

Study of Water Quality of the Ebrié Lagoon and Proposal of Toxin Structures in Relation to Algal Efflorescences

“…The Ebrie Lagoon is a semi-enclosed paralic ecosystem, located on the Atlantic coast of Côte d'Ivoire. The area of its water body is estimated at 566 km² and its average depth is about 4-8 m [11]. Our study area can be divided into two sectors depending on the location of the sampling points and the cities crossed (Fig.…”