3种有机磷农药对黑鲷幼鱼的急性毒性研究

以体长（5．09±0．71）cm、体重（2．09±0．66）g的黑鲷幼鱼为实验动物，采用静水停食实验法，在水温（28．8±1．6）℃条件下，开展了乙酰甲胺磷、辛硫磷、三唑磷对黑鲷幼鱼的急性毒性实验。结果表明，3种农药对黑鲷幼鱼均呈现以蓄积为主导的急性毒发效应，3种农药对黑鲷幼鱼的毒性大小依次为三唑磷、辛硫磷和乙酰甲胺磷，其中乙酰甲胺磷对黑鲷幼鱼24h，48h，72h，96h的半致死浓度分别为30．11mg／L，21．83mg／L，17．30mg／L，14．07mg／L；辛硫磷对黑鲷幼鱼24h，48h，72h，96h的半致死浓度分别为0．50m马，L，0．49mg／L，0．34mg／L，0．30mg／L；三唑磷对黑鲷幼鱼24h，48h，72h，96h的半致死浓度分别为0．068mg，L，0．060mg/L，0．054mg／L，0．051mg／L。最后，还就黑鲷幼鱼对乙酰甲胺磷、辛硫磷、三唑磷的急性致毒效应特征、药物间的致毒效果及其安全浓度进行了评价。

Acute Toxicity of Three Organophosphorus Pesticides to Juveniles Acanthopagrus schlegel

Acute toxicity of triazophos acephate and phoxim on juveniles Acanthopagrus schlegel from Zhoushan Sanxin Mariculture Co LTD was done from July to August 2008. The weight and length of the juvenile was （5.09±0.71） cm and （2.09±0.66） g respectively. The result indicated that the orders of the toxicity of these three pesticides on juveniles A canthopagrus schlegel was triazophos〉phoxim〉acephate. We found that the median-lethal concentrations（LC50） in 24 h, 48 h, 72 h, 96 h to juveniles ACanthopagrus schlegel were 30.11 mg/L, 21.83 mg/L, 17.30 mg/L and 14.07 mg/L for acephate respectively; 0.68 mg/L, ,0.49mg/L, 0.34 mg/L and 0.30 mg/L for phoxim, respectively ; 0.068 mg/L, 0.060 mg/L, 0.054 mg/L and 0.051 mg/L for triazophos respectively. And the safe mass-concertrations of acephate, triazophos and phoxim to juveniles Acanthopagrus schlegel was 1.41 mg/L, 0.005 mg/L and 0.03 mg/L respectively. Finally, the thesis discussed the characters of acute toxicity, the effects and the safoncentration of these pesticides to juveniles Acanthopagrus schlegel.