Histopathological alterations in the liver and intestine of Nile tilapia <I>Oreochromis niloticus</I> exposed to long-term sublethal concentrations of cadmium chloride -- Journal of Oceanology and Limnology,2015,33(4):846-852

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	YOUNIS Elsayed, ABDEL-WARITH Abdel-Wahab, AL-ASGAH Nasser, EBAID Hossam. Histopathological alterations in the liver and intestine of Nile tilapia Oreochromis niloticus exposed to long-term sublethal concentrations of cadmium chloride[J]. Journal of Oceanology and Limnology, 2015, 33(4): 846-852

Histopathological alterations in the liver and intestine of Nile tilapia Oreochromis niloticus exposed to long-term sublethal concentrations of cadmium chloride

YOUNIS Elsayed¹, ABDEL-WARITH Abdel-Wahab^1,2, AL-ASGAH Nasser¹, EBAID Hossam^1,3

1 Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia;
2 Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo, Egypt;
3 Department of Zoology, College of Science, El-Minia University, Egypt

Abstract:

Fingerlings of Nile tilapia Oreochromis niloticus were exposed to 1.68, 3.36, and 5.04 mg/L cadmium (as CdCl₂), which represent 10%, 20%, and 30% of their previously determined 96-h LC₅₀. After exposure for 20 days, sections of the liver and intestine of treated fish were examined histologically. Histopathological changes varied from slight to severe structural modification, depending on the exposure concentration. The hepatic tissues of fish exposed to 10% LC₅₀ showed markedly increased vacuolation of the hepatocytes and coarse granulation of their cytoplasm. Abundant erythrocytic infiltration among the hepatocytes was observed in fish exposed to 20% LC₅₀. In the intestinal tissues of fish exposed to all doses, goblet cells proliferated and were greatly increased in size, the longitudinal muscularis mucosa was disturbed and, in the crypts of the sub-mucosal layer, apoptosis increased, indicated by large numbers of degenerated nuclei. Large numbers of inflammatory cells and dilated blood vessels were observed in the intestine of the group treated with 30% LC₅₀.

Received: 2014-03-27 Revised: 2014-06-02

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Articles by YOUNIS Elsayed

Articles by ABDEL-WARITH Abdel-Wahab

Articles by AL-ASGAH Nasser

Articles by EBAID Hossam

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