Marine Sciences-Scholarly Publications

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Seasonal Variation in Fish Distribution, Abundance and Physico-Chemical Parameters of Wetland Areas in Oyo State, Nigeria.
(International Formulae Group, 2009) Ayoola, S. O.; Ajani, E.K
A study was conducted to assess the physico-chemical characteristics and fish distribution of wetland areas of Oyo State. The results revealed incidence of pollution as a result of agricultural pollution mainly due to use of agrochemicals. The water pH, Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were below the World Health Organization (WHO) and FEPA permissible limit in all the locations with the exception of Ajinapa where 5.0, 226.8 mg/l and 372.6 mg/l were recorded for pH, BOD and COD respectively. The level of agrochemical usage varied significantly (p < 0.05) among the locations examined with Ajinapa (Orire LGA) having the highest rate (65.0%) while papa-Eleye (Oluyole L.G.A) had the lowest (15.0%). A total of 16988 individuals, 11 fish species belonging to 7 families were found in 11 locations with Oreochromis niloticus (30.6%) and Clarias gariepinus (20.8%) dominating the catches. From the result, it is clear that high level of pollution in Ajinapa (Orire LGA) location is traceable to the use of agrochemical and therefore there is a need to take appropriate measure to preserve the aquatic life.