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The toxicity of Paraquat dichloride, a herbicide, was investigated with emphasis on histopathological effects ofAfrican Catfish (Clarias gariepinus) juvenile. The fishes were exposed to 0, 20, 60, 80, 110 mg/l of Paraquatdichloride .,The lethal concentration (LC50) value of Paraquat dichloride was 1.75mg/l for 96 h of exposure.Histopathology of the organs after 96 hr exposure revealed cell proliferation, lamellar fusion, lamellar cellhyperplasia, and epithelial lifting. In the liver, there was vacuolation of hepatocytes and necrosis. The changes inthese tissues occur predominantly in the 96 hr exposure. Respiratory stress, erratic swimming and instant deathof fish were observed in exposed fish, which varied with the concentration of the toxicant. Paraquat dichloride ishighly toxic to Clarias gariepinus, therefore its use near fish farms or in areas close to aquatic bodies should notbe encouraged.
Ladipo et al. (Wed,) studied this question.