ACUTE TOXICITY OF DELTAMETHRIN TO GOLDFISH CARASSIUSAURATUS UNDER VARYING EXPERIMENTAL CONDITIONSMADHUBAN DATTA
Four sets of bioassays were conducted to evaluate acute toxicity of deltamethrin, a pyrethroid pesticide, to gold fish Carassius auratus under varying experimental conditions using static bioassay procedure of APHA (2005). It was found that the acute toxicity of deltamethrin to gold fish was profoundly influenced by solvent and water quality parameters. The acetone solution of deltamethrin was found about 10,000 times more toxic than its aqueous solution. Gold fish was found more susceptible to deltamethrin in public supply/tap water with hardness 250±6 mg/L as CaCO3 (96h LC50 0.0028 mg/L) as compared to deltamethrin in borewell water with hardness 670±7 mg/L as CaCO3 (96h LC50 0.0049 mg/L) Susceptibility also increased during summer (temperature 24.5±10C) as compared to winter (15.5±10C) with summer 96h LC50 value being 0.0028 mg/L and winter 96h LC50 being 0.0049mg/L.
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