International Journal of Pure and Applied Zoology

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Studies on The Acute Toxicity of Pesticides on The Freshwater Fish Labeo Rohita

The present study was carried out to investigate the LC50 of two different pesticides such as monocrotophos and lambda cyhalothrin on the freshwater fish Labeo rohita. Monocrotophos caused 100% mortality of L. rohita at 0.0044ppm and 50% mortality (96 hours) at 0.0036 ppm, and for lambda cyhalothrin, the lethal effect was at 0.0029 ppm and LC50 at 0.0021 ppm. The LC50 values obtained at 24, 48, 72 and 96 hours exposures and the 95% confidence limits for the two pesticides revealed that lambda cyhalothrin showed higher toxicity than monocrotophos. The LC50 values of monocrotophos for 24, 48, 72 and 96 hours were 0.0041, 0.0039, 0.0037 and 0.0036 ppm respectively, whereas the LC50 value of lambda cyhalothrin for 24, 48, 72 and 96 hours were 0.0026, 0.0024, 0.0022 and 0.0021 ppm, respectively.