Abstract
The objective of the present study was to investigate the nutritive value and heavy metals accumulation in the flesh of Clarias lazera (Cuvier and Valenciennes) reared in the discharge canal of Soba wastewater treatment station, south Khartoum, Sudan. A total of 57 fish were collected from the canal and 52 from the White Nile which served as the control. The proximate composition of fish and concentrations of eight hazardous heavy metals i.e. chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), lead (Pb), robidium (Rb), strontium (Sr), and mercury (Hg) in the flesh of C. lazera were measured. The results which were statistically analyzed revealed insignificant differences in moisture, ash, fat contents, energy value, and fat: protein ratio (P>0.05) between the two studied sites. A significant difference (P 0.05). Fe, Cu, Zn and Rb concentrations were significantly higher in treated wastewater fishes than natural water fishes (P 0.05). Nevertheless, the concentrations of most considered elements were lower than levels recommended by various international agencies.
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