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中文摘要：
采用半静态方式水生生物急性毒性实验法，研究了在实验室常温条件下敌百虫、稻瘟灵、毒死蜱、阿维菌素四种稻田杀虫剂对克氏原螯虾（ Procambarus clarkii）的急性毒性。结果显示，敌百虫、稻瘟灵、毒死蜱、阿维菌素对体重为（34.43±7.04）g克氏原螯虾的24 h半致死浓度（24 h LC50）分别为65.07、42.16、0.71、1.23 mg/L，48 h半致死浓度（48 h LC50）分别为35.75、33.49、0.59、0.84 mg/L；96 h半致死浓度（96h LC50）分别为12.54、18.83、0.45、0.37 mg/L。其安全浓度分别为3.24、6.34、0.122、0.117 mg/L。根据国家标准和本实验数据可以看出，敌百虫和稻瘟灵对克氏原螯虾中毒，毒死蜱和阿维菌素对其高毒。
英文摘要：
The acute toxicity of four pesticides to Procambarus clarkii were studied under laboratory conditions and room temperature.The results showed the mean static acute 24 h LC50 of dipterex , isoprothiolane , chlorpyrifos , avermectin were 65.07, 42.16, 0.71, 1.23 mg/L respectively, while the mean static acute 48h LC50 were 35.75, 33.49, 0.59, 0.84 mg/L respectively , The mean static acute 96 h LC50 were 12.54 , 18.83 , 0.45 , 0.37 mg/L.The safe concentration of the crayfish to the four pesticides were 3.24 , 6.34 , 0.122 , 0.117 mg/L.According to the national standard and the ex-perimental data , trichlorfon and isoprothiolane belonged to the medium -toxic substances of P.clarkii, while avermectin and chlorpyrifos belonged to the high -toxic substances of P.clarkii.
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