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The present study was conducted to find out the effect of atrazine on kidney of Barbus carnaticus through histopathological examination. The 1/10th of the corresponding LC 50 values were treated as sublethal concentrations. Result showed that sublethal concentrations of atrazine produced drastic changes in histological structure of kidney. Observing all changes in kidney, it is concluded that sufficient precautions should be taken while using chemical fertilizers, herbicides and pesticides. They are destroying aquatic life.
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