Relationships between heavy metal content and body weight of selected freshwater fish species of the lower Ikpoba River in Benin City, Nigeria
2003
Oguzie, F.A. (University of Benin (Nigeria). Dept. of Fisheries)
The relationships between the heavy metals content and body weight of edible muscle of selected freshwater fish species of the lower Ikpoba river in Benin City Nigeria, were studied using the atomic absorption spectrophotometry technique. 27 samples of Clarias gariepinus (average wt: 110.80 plus minus 36.31g); 36 samples of Channa obscura (average wt: 65.20 plus minus 27.20g) and 18 samples of Chromidotilapia guentheri (average wt: 80.10 plus minus 31.70g) were used for the study. Mean heavy metals concentration (mug/g dry wt.) varied from Cd (0.02 plus minus 0.01), through Cu (0.25 plus minus 0.07), Pb (0.40 plus minus 0.60) to Zn (6.0 plus minus 1.03) in Clarias gariepinus and through Cd (0.02 plus minus 0.03), Cu (0.04 plus minus 0.02), Pb (0.27 plus minus 0.05) to Zn (2.10 plus minus 0.02) in Channa obscura and through Cd (0.02 plus minus 0.05), Cu (0.30 plus minus 0.05), Pb (0.40 plus minus 0.2) to Zn (6.15 plus minus 1.70) in Chromidotilapia guentheri. Relatively low metal values were recorded in Channa obscura. Significant correlations were recorded between cadmium, lead, zinc and copper and body weight of Clarias gariepinus and Chromidotilapia guentheri (P less than 0.05). However, in the predatory Channa obscura, statistical analysis showed that copper and zinc contents were significantly correlated while cadmium and lead were not (P greater than 0.05).
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