From January to December 2013, three stations along the Oramiri-Ukwa River were studied to determine the fish variety and distribution. The examination uncovered the presence of 25 fish species from 16 different families. Local fishermen assisted in collecting fish samples twice a month using hook and line, Gill net, cast net, Bagnet, and local traps. Tilapia zilli was the most prevalent and highest-caught species, accounting for 12.5 percent of the total catch. The smallest species were Brycinus leuciscus, Fundulopanchax gardneri, Petrocephalus bane bane, Parailia pellucida, Malapterurus electricus, Polypterus senegalus, Parachanna africana, and Shilbe mystus. Shannon-Weiner (H), Simpson's index of dominance (D), and Simpson's index of diversity (1-D) were 0.0083, 0.0028, 0.084 and 0.027, 0.091, 0.281 and 0.973, 0.909, 0.719 for the three stations, respectively. According to the findings, increased human activities are limiting fish variety and distribution in the studied area. This is because the study's species composition was lower than that of other studies in the same body of water. To sustain the ecosystem's environmental health and integrity, autogenic and anthropogenic risks, as well as detrimental activities that predispose fish species to extinction within the river's floodplain and catchment area, should be submitted to environmental inspection.
Author(S) Details
G. S. Adaka
Department of Fisheries and Aquaculture, School of Agriculture and Agricultural Technology, Federal University of Technology, P.M.B.1526, Owerri, Imo State, Nigeria.
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