The freshwater fish, Channa gachua was exposed to sub-lethal concentrations of an organophosphorus pesticide, monocrotophos. The fish was exposed to acute toxicity of monocrotophos for 16, 24 and 48 hours while for chronic toxicity it was exposed for 15, 30 and 45 days. The monocrotophos was found to be toxic to the fish, which was found to be increasing with the increase of its concentration. Alterations in various biochemical parameters of fish were observed. The exposure of 0.072 ppm concentration of monocrotophos led to the addition in cholesterol, alkaline phosphatase in plasma, triglyceride in plasma, serum bilirubin, serum creatinine, SGPT and SGOT while reduction in plasma glucose, total protein and lipid peroxidation.
In the present study the sub-lethal effect of copper on various haematological parameters of Clarias batrachus were studied. Copper (as copper sulphate) was used to prepare the stock solution from which different standard concentrations were prepared. A total of 16 specimens of Clarias batrachus (mean weight and length 100gm and 18-20 cm, respectively). were used for this purpose. In exposed fishes various haematological changes were noticed. The RBC counts and haemoglobin percentage was decreased significantly from the normal values.
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