DETERMINATION OF TRACE-METALS IN FISH, ASSOCIATED WATERS AND SOIL SEDIMENTS FROM FISH PONDS

The concentration of sodium, calcium, magnesium, manganese, iron, copp er, cobalt and cadmium were determined in the fish (Tilapia guineensis ), associated water and sediment from three selected fish ponds locate d at Odigbo, Ondo and Igbotako in Ondo State of Nigeria. Atomic adsorp tion spectro-photometer was used to determine calcium, magnesium, mang anese, iron, copper and cadmium. Sodium and potassium were determined with a flame photometer while magnesium was determined by complexometr ic titration with EDTA. The levels of the metals in water were very mu ch lower than their corresponding concentrations in the sediment and t he levels in the sediment were less than those in the fish. In particu lar, the fish appeared to concentrate many of the metals from the aqua tic habitat into its body.