[Objective] The research aimed to study acute toxicity of drugs to the larva of Carassius auratus in Qihe River. [Method] Under the indoor normal temperature and hydrostatic conditions, with larva of Qihe Carassius auratus as the test organism and lethal rate as the index, acute toxicity of formaldehyde and trichlorfon to the larva was studied.[Result] Within the same exposure time, the higher the concentration of formaldehyde and trichlorfon solution, the more the mortality of larva. Semi-lethal concentration (LC50) of trichlorfon at 24, 48 and 96 h were 108.63, 89.20 and 75.30 mg/L, its safe concentration (SC) was 7.53 mg/L; while semi-lethal concentration (LC50) of formaldehyde at 24, 48 and 96 h were 165.33, 134.04 and 119.42 mg/L, its safe concentration (SC) was 11.94 mg/L. [Conclusion] In the disease prevention of Qihe Carassius auratus larva, trichlorfon is safer and formaldehyde should be used with caution.%[目的] 研究药物对淇河鲫仔鱼的急性毒性.[方法]在室内常温、静水条件下,以淇河鲫仔鱼为受试生物,以致死率为指标,研究了甲醛和敌百虫对淇河鲫仔鱼的急性毒性.[结果]在同一暴露时间,随着甲醛和敌百虫溶液浓度增大,淇河鲫仔鱼的死亡率逐渐上升.敌百虫24、48、96 h的半致死浓度(LC50)分别为108.63、89.20、75.30 mg/L,安全浓度(SC)为7.53 mg/L;甲醛24、48、96 h的半致死浓度(LC50)分别为165.33、134.04、119.42 mg/L,安全浓度(SC)为11.94 mg/L.[结论]在淇河鲫仔鱼疾病防治中,使用敌百虫较安全,而甲醛要慎用.
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