Abstract
This study aims to characterize the spatio-temporal variation of the fish assemblages in relation to the environmental variables of Buyo Dam Lake. Sampling was performed from July 2017 to June 2018 using experimental fishing and commercial fishing. Spatio-temporal analysis indicated a significant variation (p <0.05) in pH, electrical conductivity, total dissolved solids, and water transparency. A total of 45 species from 27 genus and 15 families were collected in the samples sites. Two species (Chrysichthys johnelsis and Malapterurus barbatus) are reported for the first time in the lake of Buyo. Among the fishes sampled, of Cichlidae (35.04%) and Claroteidae (16.43%) were the most abundants. The abundant species are Oreochromis niloticus (15.55%) and Chrysichthys nigrodigitatus (15.15%). The analysis of the structure of fish assemblages (H' from 2.28 to 2.75, E from 0.68 to 0.84) revealed a fairly diverse lake environment. The canonical correspondence analysis revealed the significant influence of water pH, electrical conductivity, dissolved solids content, water transparency and nitrite in the distribution of fish species in the lake of Buyo. This work constitute a baseline study for future investigations and will contribute to the implementation of a sustainable management plan for fisheries resources in the continental water. Key words: Environmental parameters, fishes, settlement, Lake of Buyo, Cote d’Ivoire.
Highlights
Knowledge of the ichtyological fauna in African rivers and lakes is of concern to both scientists and development officials (Lalèyè et al, 2004)
Their work focused on the impact of fishing on fish availability in the area surrounding the lake, the socioeconomic consequences of the expulsion of the nonindigenouse fishermen, the analytical study of chemical characteristics and biological diversity and fish assemblage characterization of the lower Sassandra River
Apart from the work of Kouamé et al (2008) which characterizes the fish assemblage of the lower Sassandra River, there are no available data concerning the fish assemblage of the lake of Buyo, nor on the environmental parameters that influence the distribution of these species
Summary
Knowledge of the ichtyological fauna in African rivers and lakes is of concern to both scientists and development officials (Lalèyè et al, 2004). Apart from the work of Kouamé et al (2008) which characterizes the fish assemblage of the lower Sassandra River, there are no available data concerning the fish assemblage of the lake of Buyo, nor on the environmental parameters that influence the distribution of these species. This lake plays a vital role in fish production in Côte d'Ivoire. Preventive measures deserve to be taken for better management of fishery resource It is within this framework that this study aims to characterize the ichthyological settlement in the lake of Buyo by a spatio-temporal approach while highlighting the environmental variables that influence the distribution of fish species of this lake
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