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  Online Journal of Veterinary Research © 

  14 (2): 233-245, 2010. Redacted 2017.

Toxicological assessment of thiobencarb and dithiopyr on Nile tilapia

 

1Iman M.K. Abumourad; 1Hossam H. Abbas; 2Ashraf A.El-Badawi and 1Mohammad M. N. Authman1*

 
1 Department of Hydrobiology, National Research Centre, Dokki, Giza,  2Central Lab. For Aquaculture Research-Abbasa, Abo-Hamad, Sharkia- Egypt

 

ABSTRACT

 

Abumourad IMK, Abbas HH, El-Badawi AA, Toxicology of thiobencarb and dithiopyr on Nile tilapia, Onl J Vet Res, Volume 14 (2): 233-245, 2010. Thiiobencarb and dithiopyr are used as weed killers in rice fields where tilapia are cultured. Leaching into soil and thus water, also occurs. Nile tilapias were exposed acutely or chronically to thiobencarb and dithiopyr as single and mixed treatments. The LC50 was 720 µgl-1 and 280 µgl-1 for thiobencarb and dithiopyr, respectively. High tissue concentrations were found in liver but low values in brain. Elevated serum and muscle total protein and alkaline phosphatase were observed during acute and chronic exposure.  Apoptotic bands in the spleen, kidney and liver with micronuclei suggested alteration of cell division in gills exposed acutely or chronically to polluted water. Long–term exposure to the combined herbicides produced severe degenerative changes in the parenchymatous organs, wide spread necrosis and activation of melanocytes.

 

Key words: Nile tilapia, herbicides, thiobencarb, dithiopyr, tissues residue, biochemical parameters, histopathology, cytotoxicity.

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