TITLE:
The Fish Fauna of the Future Large Size Reservoir of Ouessa, on the Mouhoun River, Burkina Faso
AUTHORS:
Raymond Ouedraogo, Florent M. Y. Sawadogo, Nomwine Da, Komandan Mano
KEYWORDS:
Ichthyofauna, Reservoir, Ouessa, Mouhoun River, Burkina Faso
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.12 No.10,
October
25,
2021
ABSTRACT: Reliable and basic information on fish are required for
the sustainable management of a fishery. For this reason, the fish fauna of the
future reservoir of Ouessa in the low section of the Mouhoun River, Burkina
Faso is studied. In order to describe the fish community, the fish were sampled
in March 2020 thanks to cast nets and gill nets. They were sorted into species
and each fish was weighted at the nearest 0.1 g and its total length measured
at the nearest mm. The landings of commercial fishermen were also observed. In
total, 1059 fishes were collected and grouped into 42 species, 27 generas and
16 families. The dominant species were Synodontis
nigrita, Synodontis schall, Marcusenius senegalensis, Schilbe intermedius, Brycinus nurse and Alestes baremoze. However, the compilation of diverse sources
suggests the presence of nearly 70 species. The index of Shannon-Weaver (3.97),
the values of the condition factor, the fish size and the presence of
intolerant species indicate the relatively good conditions of the aquatic
ecosystem. Among the 24 dominant species, 54% have a positive allometric
growth, 42% a negative allometric growth and 0.04 an isometric growth. This
study builds the basis of sustainable management of the future reservoir of
Ouessa that is planned to be the largest one of the country (40,000 ha large).