Acute Toxicity of Three Common Organophosphorus Pesticides on Cirrhinus mrigala Juvenile

Acute toxicity of triazophos,acephate and isocarbophos on Cirrhinus mrigala juvenile from Qin Gang farm was done from July to August 2005.The weight and length of the juvenile were(5.38±0.40) cm and(2.58±0.51) g respectively.It was found that median-lethal concentrations in 24 h,48 h,72 h,96 h were 0.080 mg/L,0.065 mg/L,0.060 mg/L,0.050 mg/L for triazophos respectively,113.779 mg/L,114.451 mg/L,113.366 mg/L,113.214 mg/L for acephate respectively,and 0.736 mg/L,0.549 mg/L,0.469 mg/L,0.280 mg/L for isocarbophos respectively.The safe-concentrations in 96h of these three drugs were 0.005 mg/L,0.028 mg/L,and 11.321 mg/L respectively,indicating that the order of the toxicity of these three drugs was triazophosacephate isocarbophos in turn.Finally,the thesis talked about the acute toxicity effects and the safe-concentrations of these drugs on Cirrhinus mrigala juvenile.