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Authors
Affiliations
1 Department of Biology, Adeyemi College of Education, Ondo, Ondo State, NG
2 Department of Fisheries and Aquaculture Technology, Federal University of Technology, Akure, Ondo State, NG
Source
International Journal of Innovative Research and Development, Vol 5, No 9 (2016), Pagination: 324-328
Abstract
8464 fishes captured at Ero reservoir bimonthly using various gill net mesh sizes 50.8mm, 63.5mm, 78.2mm, 88.9mm and 101.6mm were identified into four (4) species as Oreochromis niloticus, Coptodon zillii, Tilapia guineensis and Clarias gariepinus. These fishes belong to two (2) families of Cichilidae and Clariidae. Specimens were weighed to the nearest grams and standard length were measured to the nearest centimeters and the highest species number was recorded for Cichilidae family. Growth coefficient b of the LWR ranged from 1.13 to 3.43, Coptodon zillii, Tilapia guineensis and Clarias gariepinus species showed negative allometric growth pattern while Oreochromis niloticus had positive allometric growth. Species diversity was determined by Simpsons index while dominance and evenness by Shannon weiner index of diversity. Simpsons index (D) = 0.42, Simpson’s index of diversity (1-D) = 0.57, Simpsons Reciprocal index (1/D) = 0.43, Evenness = 0.57. Water quality parameter showed slight variation between rainy and dry seasons.
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