Chromium, copper, iron and manganese bioaccumulation in some organs and tissues of Oreochromis mossambicus from the lower Olifants River, inside the Kruger National Park

The bioaccumulation of chromium, copper, iron and manganese by Oreochromis mossambicus was investigated at two localities (Mamba and Balule) in the lower Olifants River, inside the boundaries of the Kruger National Park. The Cr, Cu, Fe and Mn concentrations, recorded in the tissues of O. mossambicus at Mamba and Balule, did not differ much from each other. However, it was generally found that the highest accumulation of metals by the fish occurred at Mamba, except for iron, where the opposite occurred. The metals investigated during this study mainly accumulated in the liver and gills, followed by the skin, and lastly the muscle.