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The present results showed that heavy metals (HgCl2) have affected the biological parameters of Oreochromis niloticus. These effects depended on the duration of the exposure and the concentration of the heavy metal used. The effect of various doses level of HgCl2 on the erythrocyte count (Red blood cells) decreased under the effect of the high doses of HgCl2 (0.08 mg/l or more). A significance difference was recorded in comparison with the control fish (p<0.05).The total white blood cells counts significantly increased as the concentration of HgCl2 increase when compared to the control fish. In contrast, hemoglobin (Hb) levels significantly (p<0.05) decreased after the fish exposed to high level doses of HgCl2. Addition of selenium (Na2SeO3) at doses of 1.0 and 2.0 mg/kg to fish food for a period of 20 days of treatment with HgCl2 improved blood constituent. Treated gills with high doses of HgCl2 showed alteration on both of primary and secondary lamellae and an increase in the mucous secretion when compared with the control tissue. No abnormalities occurred in the liver of control fish. The main alterations in the liver of fish were observed after treatment with high doses level of HgCl2 (0.06-0.08mg/l). The hepatocytes were hypertrophied and the nuclei showed necrosis.
DOI
10.21608/ejabf.2019.33802
Keywords
Remediation, selenium, mercury, Haematology, histopathology, Oreochromis niloticus
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https://ejabf.journals.ekb.eg/article_33802.html
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https://ejabf.journals.ekb.eg/service?article_code=33802
Publication Title
Egyptian Journal of Aquatic Biology and Fisheries
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https://ejabf.journals.ekb.eg/
MainTitle
Remediation of toxic effect of Mercuric Chloride on the Nile Tilapia, Oreochromis niloticus using Selenium