Keywords
Bioaccumulation
Moro Lake
Parachanna obscura
Mormyrus rume
Abstract
Aquatic environment with its water quality is considered the main factor controlling the state of health and disease in both cultured and wild fishes. Heavy metals have WHO limit, above which are toxic, some toxic effects include: reduced growth and development, cancer, damaged to the nervous system and in extreme cases death. The present study analysed and compared the accumulation of heavy metals (Zn, Pb, Cd, Cu, Fe, and Mn) in tissues of Parachanna obscura and Mormyrus rume of Moro lake Kwara state. The purposive sampling was done to determine the concentration of heavy metals in three sites of River Moro in Ilorin Kwara State. Samples were analyzed in the laboratory for heavy metals analysis using Perkin Elmer Analyst 300 Atomic Absorption Spectrophotometer (AAS). Fe was observed to be the highest absorbed metals in all the fishes studied when compared with other heavy metals analysed in the fishes. It was also observed that the muscles of the two fish species analyzed absorbed more heavy metals than the gill and liver. The order of concentration in the fish species was Fe>Zn>Cu>Pb>Mn>Cd. The monthly variation shows that there was a higher accumulation of heavy metals in the month of May than the other months. Finally, the concentration of heavy metals analysed in Parachanna obscura varied and Mormyrus rume fell within the WHO and FEPA maximum permissible limit, thus, consumption of captured fish from river Moro, Kwara State is safe.
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