TOXICITY AND BIOACCUMULATION OF CADMIUM CHLORIDE IN NILE TILAPIA (OREOCHROMIS NILOTICUS) AND THE PROTECTIVE ROLE OF QUICK LIME (CALCIUM OXIDE) | ||||
| Egyptian Journal of Zoology | ||||
| Article 10, Volume 64, Issue 64, December 2015, Page 195-212 | ||||
| Document Type: Original Research Papers | ||||
| DOI: 10.12816/0019291 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Nadia A. El-fahla; Mariam M. Sharaf; Yomn M. Mobarak | ||||
| Department of Zoology, Faculty of Science, Suez Canal University, Ismailia, Egypt | ||||
| Abstract | ||||
| The present study was carried out to investigate the toxic effects of waterborne cadmium chloride (CdCl2.H2O) on Oreochromis niloticus and the possible protective role of quick lime (CaO) against Cd toxicity. Fish weighing 44.55±2.96 g were exposed to 1 and 2 mg CdCl2 L-1 individually and in mixture with quick lime 60 mg CaO L-1 for 30 days followed by 15 days recovery. Although, the results revealed a slight decrease in final weight (W) and total length (TL) of Oreochromis niloticus exposed to sublethal concentrations of cadmium (1 and 2 mg CdCl2 L-1) individually and in mixture with quick lime (60 mg CaO L-1) for 30 days in comparison with the control groups, a non-significant differences were recorded in fish condition factor (K) of the different studied treatments. However, there was a significant (p<0.05) decrease in the hepato-somatic index (HSI) in Cd-treated fish as compared to the control ones. The accumulation of Cd in muscles, gills and livers of fish were significantly (p<0.01, p<0.001 and p<0.001, respectively) increased with increasing Cd concentration in all Cd-treated groups compared to controls. The accumulated pattern of Cd in these tissues was in the following order: livers>gills>muscles. Moreover, quick lime play a role as a protective agent in eliminating residual Cd from the studied vital organs and improve fish growth indices to levels more or less similar to control groups. | ||||
| Keywords | ||||
| Nile tilapia; Cadmium chloride; Quick lime; Fish growth, Cd bioaccumulation | ||||
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