Biomagnification factor of some heavy metals (Zn, Fe, Pb and Mn) were determined in sediment and fish (Tilapia mossambis) samples collected from major dams in Ekiti- State, Nigeria. It was established that the biomagnification factors for fish were higher in both season than in water, while that of sediment were greater in both seasons than for fish and water. The concentration of heavy metals in water and fish were within the international permissible level, however the study have shown that fish and sediment can be adequately used to monitor pollutional trend of heavy metals in the dams in Ekiti- State.
