MONITORING OF SOME HEAVY METALS IN RIVER NILE WATER IN RELATION TO THEIR LEVELS IN TILAPIA IN UPPER EGYPT | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 22, Volume 74, Issue 1, March 1996, Page 239-251 PDF (3.61 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1996.427366 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| ESAM H. RIZKALLA1; MAHMOUD A. ABO-DONIA2 | ||||
| 1Animal Health Research Institute, Agricultural Research Centre, Giza, Egypt | ||||
| 2National Research Centre, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| Levels of three heavy metal residues, cadmium, chromium, and lead were monitored in water, sediment and deboned flesh of tilapia fish harvested from the upper section of river Nile. In water, the maximum mean concentration of two elements studied (Cr and Pb) were monitored in Sohag Governorate. All the values were found below the detection limit. This indicates that no clear metal pollution problems lie in the Nile water. In sediment, Cr and Pb concentrations were higher in front of Mangabad fertilizer manufactory. Also, Cd and Pb concentrations were higher in front of Nagi-Hamady Sugar manufactory. The concentrations of heavy metals in sediment were 231 to 735 times higher than those in the water. Results of the analysis of the deboned flesh of tilapia are presented along with location of harvest. Sohag onion manufactory had greater concentration of Cd and Cr. The metal-specific differences in the concentration levels of sediment and deboned flesh are existing between the different localities. A significant negative correlation between deboned flesh, cadmium and chromium residues, and fish length were calculated. The toxic effect may interpret this observation. | ||||
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