氨氮对2种规格克氏原螯虾的急性毒性研究

Acute Toxicity of Ammonia-N to Two Specifications of Procambarus clarkii Adult

采用常规生物急性毒性试验法,探讨了氨氮对2种规格克氏原螯虾(Procambarus clarkii)的急性毒性。结果表明,在水温(24.93±2.7)℃条件下,离子氨氮对体重为(6.8±1.2)g和体重为(12.8±1.1)g的克氏原螯虾的24、48、72、96h的半数致死浓度(LC50)分别为289.36、219.50、185.97、169.83mg/L和441.88、368.61、305.07、262.64mg/L,安全质量浓度(SC)分别为37.89mg/L和76.95mg/L;非离子氨对体重为(6.83±1.25)g及体重为(12.78±1.14)g的克氏原螯虾的24、48、72、96h的半数致死浓度(LC50)分别为9.70、7.89、7.22、6.70mg/L和12.65、11.18、10.91、9.11mg/L,安全质量浓(SC)度分别为1.56mg/L和2.62mg/L。克氏原螯虾对氨氮有较强的耐受力。

Acute Toxicity of ammonia nitrogen to two specifications of Procambarus clarkii adult were studied using the method of usual biological acute toxic test.The crayfish were divided into 2 groups by their average body weight of(6.8±1.2)g and(12.8± 1.1)g.The half lethal concentrations of 24,48,72,96h of ammonia nitrogen on 2 speifications of Procambarus clarkii adult were 289.36,219.50,185.97,169.83mg/L(average body weight(6.8±1.2)g)and 441.88,368.61,305.07,262.64mg/L(average body weight(12.8±1.1)g) respectively,the safe concentrations of ammonia nitrogen were 37.89mg/L and 76.95mg/L respectively under(24.9±2.7)℃;the half lethal concentrations of 24,48,72,96h of non-ionic ammonia on 2 specifications of Procambarus clar-kii adult were 9.70,7.89,7.22,6.70mg/L(average body weight(6.8±1.2)g)and 12.65,11.18,10.91,9.11mg/L(average body weight(12.8±1.1)g),the safe concentrations of non-ionic ammonia were 1.56mg/L and 2.62mg/L respectively.The experimental results showed that Procambarus clarkii adult could tolerate strong ammonia.