ASSESSMENT OF THE DISTRIBUTION OF METALS IN ORGANS OF PAPYROCRANUS AFER, XENOMYSTUS NIGRI AND TILAPIA MARIAE (PISCES) FROM IKPOBA RIVER BENIN CITY NIGERI

M. O. Edema, C. U. Edema, M. O. Erhunmwunse, M. Adodo

Abstract


The distribution of nine metals in the gills and muscles of Papyrocranus afer, Xenomystus nigri and Tilapia mariae from Ikpoba River was assessed by Atomic Absorption Spectrophotometry. Cadmium (Cd), calcium (Ca), chromium (Cr), iron (Fe), magnesium (Mg), manganese (Mn), nickel (Ni), lead (Pb) and zinc (Zn) were detected in the gills and muscles. Three essential metals namely Calcium(Ca), Magnesium(Mg) and Iron(Fe) predominated in both organs of the three fish species. Among the featherbacks (P. afer and X. nigri ) the gills had higher concentrations of Cd (0.03, 0.08mg/kg), Ca (398.0, 463.00mg/kg), Cr (0.10, 0.10mg/kg) and Ni (0.89, 0.91mg/kg) than the muscles Cd (nd, nd), Ca (236.0, 261.0mg/kg), Cr (0.05, 0.04 0mg/kg), Ni (0.63, 0.71 mg/kg). In contrast, the muscles had more Mn (0.34, 0.40 mg/kg) and Pb (1.52, 0.13 mg/kg) than the gills (Mn 0.08, 0.08 mg/kg), Pb (1.03, 0.09 mg/kg). Theconcentrations of Pb and Zn were higher in P. afer (1.03, 1.29mg/kg) than in X. nigri (0.13, 1.09 mg/kg). Discarding the gills before cooking fish for consumption is hereby recommended as a means of reducing the biomagnification level of heavy metals in man.

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