摘要：The aim of present study to determine the effect of sublethal concentration of paraquat on selected organs of African Catfish. The sublethal concentration of paraquat on the tissue aminotransferases of the African catfish ( Clarias gariepinus ) showed significance difference (p<0.05). Two concentration of paraquat (0.30 and 0.15 mg L-1) where used for the exposure. The increase in the levels of determined tissue aminotransferases were directly proportional to the concentrations of paraquat and the exposure periods thus are dose and duration dependent. The protein metabolism as indicated by the levels of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) in the gill, kidney, muscle, liver, spleen, intestine and brain of the experimental fish ( Clarias gariepinus ) showed significantly increases (p<0.05) in their activities. Liver and kidney were the most affected organs while brain was the least affected.
