Effect of Zinc Oxide Toxicity on African Cat Fish Clarias gariepinus Present in the River Nile (Hawamdya)
Mona, S. Zaki*1, Nabila, Elbattrawy2 Nagwa, S. Ata3 and Shalaby S. I4
1Department of Hydrobiology, National Research Centre, Cairo, Egypt
2Department of Microbiology, Reproductive institute, Cairo, Egypt
3Department of Microbiology, National Research Centre, Cairo, Egypt
4Deptartment of Animal Reproduction, National Research Center, Giza, Egypt
Abstract: The effect of dietary carbohydrates and mercuric oxide on haematalogical profile, blood chemistry and hormonal level was studied in African cat fish (Clarias gariepinus). Thirty Fish were divided into 3 equal groups, exposed to different doses of zinc oxide and carbohydrate. Group (1) was served as control. Group (2) was fed with carbohydrate and mercuric oxide (10 mg Kg-1 diet ration). Group (3) was fed with carbohydrate and zinc oxide (1 5 rng Kg-1 diet ration). There is a significant decrease in hemoglobin and P .C.V in group (3). There is a significant increase in serum corlisol, cholesterol, AST, ALT, urea, creatinine and alkaline phosphorous in group (3). Also there is a significant decrease in serum phosphorous, sodium and potassium in treated fish. There is a significant high level of zinc content in kidney, muscles, heart and spleen in group (3) suggesting toxic effects of zinc oxide on African cat fish (Clarias gariepinus). The total viable count of bacteria identified higher in fish fed on carbohydrate zinc and the predominate bacteria were identified as, E. coli and Pseudomonas, fluorscences. We emphasize the finding that an increase carbohydrate concentration causes harmful pathological effect which reduces humoral immune responses and enhances dietary zinc toxicity.
[Mona, S. Zaki, Nabila, Elbattrawy Nagwa, S. Ata and Shalaby S. I. Effect of Zinic Oxide Toxicity on AfricanCat Fish Clarias gariepinus Present in the River Nile. Life Sci J 2013;10(1):1869-1873] (ISSN:1097-8135).http://www.lifesciencesite.com.
Keywords: Clarias gariepinis, mercuric pollution, haematalogical, biochemical, clinicopathological, Bacteria account.