三种常用农药对中华绒螯蟹幼蟹的急性毒性研究

Acute Toxicity of Three Pesticides to Juvenile Chinese Mitten Crab(Eriocheir sinensis)

在水温20-23℃、pH7.5条件下，采用半静态法研究了阿维菌素、毒死蜱和三唑磷对体质量（6.3±0.9）g中华绒螯蟹（Eriocheir sinensis）幼蟹的急性毒性。结果表明：阿维菌素对幼蟹24、48、72、96h的半致死质量浓度分别为126.02、95.82、82.74、73.44mg·L^-1；毒死蜱对幼蟹24、48、72、96h的半致死质量浓度分别为0.73、0.65、0.56、0.49mg·L^-1；三唑磷对幼蟹24、48、72、96h半致死质量浓度分别为5.56、4.49、3.88、3.62mg·L^-1。三种药物对中华绒螯蟹幼蟹的毒性大小依次为：毒死蜱〉三唑磷〉阿维菌素。

The acute toxicity of avermectin, chlorpyrifos and triazophos to juvenile Chinese mitten crab（Eriocheir sinensis） with body weight （6.3±0.9）g was studied at water temperature of 20-23℃and pH 7.5 by a semi-static test method. The results showed that the median-lethal concentration of avermectin was found to be 126.02mg·L^-1 for 24h, 95.82 mg·L^-1 for 48h, 82.74 mg·L^-1 for 72h and 73.44mg·L^-1 for 96h. The median-lethal concentration of chlorpyrifos was shown to be 0.73 mg·L^-1 for 24h, 0.65 mg·L^-1 for 48h, 0.56mg·L^-1 for 72h and 0.49 mg·L^-1 for 96h. The median-lethal concentration of triazophos was 5.56 mg·L^-1 for 24h, 4.49 mg·L^-1 for 48h, 3.88mg·L^-1 for 72h and 3.62mg·L^-1 for 96h. The acute toxicity order of the three pesticides to Chinese mitten crab juveniles was ranged as chlorpyrifos〉triazophos〉avermectin.