Heavy Metal Bioaccumulation and Histopathological Studies of Fish Tissues from Ose River, Ondo State, Nigeria

The exposure of the aquatic ecosystem to heavy metal from both natural and anthropogenic activities are on rise have harmful health effects all organisms human. This study assessed concentrations metals (Fe, Pb, Cd, Cr, As Zn) in surface water, sediments fish tissues Ose River examined histopathological changes two species (Mormyrus rume Clarias garienpinus). Surface samples were collected procured Ondo State, Nigeria February April 2021. Heavy digestions done laboratory using HNO3/HCl while determined Atomic Absorption Spectrometer. Histopathological alterations also assessed. Bioaccumulation factor (BAF), ecological risk index potential level used assess investigated concentrations. In concentration Cd (0.010–0.030 mg/l) (0.010–0.05 exceeded WHO limits 0.01mg/l respectively Fe, Cr Zn within limits. sediments, except Pb As. (0.30±0.000–4.12±0.030 mg/l), (9.970±0.010–30.77±0.023 (0.026±0.002–0.331±0.004 (ND-0.331±0.004 seen be higher than permissible 0.5 mg/l, 5 0.005 mgl 0.05-0.15 mg/l respectively. BAF showed no probability. observed kidneys cholestasis, necrosis, loss glomeruli structure tubular necrosis. While gills congestion central veins interlamellae hyperplasia caused by presence a monogenean parasite. livers however revealed hepatocytes nuclei, necrosis lymphocytic infiltrate. that site was polluted with may pose serious issues fishers, those water people feeding river. therefore suggests good indicators for bio-monitoring River. Seeing hence, more comprehensive assessment river is recommended.