Changes in Lymphocytes in Three Sizes of African Catfish (Clarias gariepinus) Exposed to Different Chemicals in the Laboratory
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Abstract
Changes in the number of lymphocytes in the blood of three sizes of Clarias gariepinus exposed to three pesticides paraquat dichloride (PARAQ), 2,2-dichlorovinyl phosphate (DDVP) and dimethoate (DMC) at the concentrations of 0.00 control, 1.00, 2.00, 3.00 and 4.00 mg/L were carried out. The result obtained indicated a concentration dependent increase which was more pronounced in the fish exposed to paraquat dichloride, followed by DDVP, while the lowest effect was observed in the fish exposed to dimethoate in all sizes of the fish. The result revealed that paraquat was more toxic to the fish, causing more stress as indicated through elevation of the lymphocytes in the blood stream of the fish.
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