Abstract
A comparative study to determine the bio-accumulation, of heavy metals in differentorgans of fish (Oreochromis niloticus) in Ologbo River was conducted. The studywhich spanned a period of three months from June to August, 2011 investigatedconcentrations of heavy metals including Iron, Zinc, Copper, Manganese andChromium (Fe, Zn, Cu, Mn and Cr) using the Atomic Absorption Spectrophotometer.The selected organs for the investigation were muscle tissues, gills and gut. Themean concentration of the studied heavy metals in the muscle tissue, gills and gut,were; Iron (7.22±0.19mg/g, 11.77±0.64mg/g and 14.60±0.78mg/g), Manganese(3.76±0.17mg/g, 8.36±0.29mg/g and 8.23±0.02mg/g), Zinc (2.66±0.16mg/g,5.66±0.16mg/g and 8.37±0.09mg/g) and Copper (7.21±0.26mg/g, 8.64±0.17mg/gand 10.74±0.10mg/g) respectively. Chromium was not detected. Gut contained thehighest levels of heavy metals in all the organs of Oreochromis niloticus. Analysis ofvariance (ANOVA) revealed high significant difference (P<0.01) between the meansof the heavy metals in the fish organs studied and the actual recommended limitspecified by the World Health Organization (WHO)
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