[目的]探讨阿维菌素、毒死蜱2种药物对草鱼的毒性效应及相互关系.[方法]以健康活泼的草鱼为试验对象,用阿维菌素、毒死蜱分别对其进行单一药物的急性毒性和2种药物组合和联合毒性试验.[结果]阿维菌素、毒死蜱、2种药物混合对草鱼24、48、72、96h的LC分别为:阿维菌素0.54、0.49、0.17、0.10 mg/L;毒死蜱0.29、0.21、0.12、0.05 mg/L;阿维菌素与毒死蜱混合药1.22、1.08、0.99、0.86 mg/L;其对草鱼的安全浓度(SC)分别为:0.010、0.005、0.086 mg/L.药物的毒性大小依次为:毒死蜱>阿维菌素>混合药.[结论]阿维菌素和毒死蜱混合药的不同浓度对草鱼的生长有显著影响,浓度越高毒性作用越大,低毒性强度的阿维菌素对毒死蜱具缓解作用.%[ Objective ] The study aimed to discuss the toxicity effect of Abamectin and Chlorpyrifos on grass carp ( Ctenopharyngodon idllus) and their interrelations. [ Method ] Taking healthy and active gass carp as the object, the acute toxicity test of single pesticide and the joint toxicity test of two pesticides on grass carp were carried out. [ Result ] The LC50 of Abamectin and Chlorpyrifos and the mixture of two pesticides against grass carp at 24,48,72 and 96 h were as follows, Abamectin :0. 54,0.49,0. 17 and 0. 10 mg/L; Chlorpyrifos :0. 29,0. 21,0. 12 and 0.05 mg/L; the mixture of two pesticides:l.22,1.08,0.99 and0. 86 mg/L. The safe concentration (SC) of Abamectin,Chlorpyrifos and the mixture of two pesticides were 0.010,0. 005 and 0. 086 mg/L,respectively. The toxicity of the pesticides in sequence was Chlorpyrifos ＞ Abamectin ＞ the mixture of two pesticides. [ Conclusion] Different concentrations of Abamectin,Chlorpyrifos and the mixture of two pesticides had remarkable effect on the growth of grass carp,the higher the concentration was,the greater the toxicity effect was. Abamectin at low toxicity intensity had antagonistic effects on Chlorpyrifos.
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