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Trace metal levels in the organs of finfish Oreochromis mossambicus (Peter) and relevant water of Jannapura lake, India.

Trace metal levels in the body organs of finfish, Oreochromis mossambicus (Peter) and relevant water was studied in Jannapura lake, located five kilometers from Bhadravathi town, Karnataka, India, during 2004-05. Lead, Copper and Cadmium accumulation was higher in muscles than in gills while, Zinc, Nickel and Cobalt accumulation was maximum in gills followed by muscles. The metals present in the highest concentration were in the order of Pb > Cu > Zn > Cd > Ni > Co in the water samples. The higher concentration of various metals in water and Pb, Ni in fish muscle and Ni in gill samples was probably due to the addition of untreated sewage, geological weathering and agricultural runoff from the surrounding areas. On the basis of results obtained, it is predicted that if the present situation of water pollution continues in future, survival of fish population and other aquatic animals will be extremely difficult.