Determination of trace heavy metals inIllisha Africanafish and in associated water and soil sediments from some fish ponds

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Abstract
Levels of zinc, iron, copper, chromium, cobalt, cadmium and lead were determined in some organs and body muscles of Illisha africana fish, water and sediments from three neighbouring man‐made freshwater ponds using an atomic absorption spectrophotometer. The ponds were located at the Research Farm of the Ondo State College of Education, Ikere‐Ekiti, Ondo State, Nigeria. The water levels of these metals were found to be much lower than their corresponding concentrations in the sediments, but the levels in the sediments were less than those in the fish. Lead, iron and copper were found to be highly concentrated in the fish organs showing some likely evidence of bioaccumulation, while chromium was not detected in any of the samples whereas cobalt was not bioaccumulated in the fish organs. However, the metals concentration in the fish body muscle was low. A chemical analysis of fish, water and the sediment has to be carried out to monitor the correlation of the trace heavy metal pollutants resulting from the uptake from the aquatic environment and their probable effect on human health.

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