铜、锌、镉对唐鱼胚胎及初孵仔鱼的急性毒性及安全浓度评价

采用静水法生物测试研究铜（Cu2＋）、锌（Zn2＋）和镉（Cd2＋）对唐鱼（Tanichthys albonubes）胚胎和初孵仔鱼的急性毒性及安全浓度评价。结果显示,Cu2＋对唐鱼胚胎12、24h LC50分别为2.4092mg/L和0.4039mg/L;Zn2＋和Cd2＋对唐鱼胚胎24h LC50分别为372.9mg/L和50.0mg/L。Cu2＋对唐鱼初孵仔鱼12、24和48h LC50都是0.3228mg/L,其安全浓度为0.0986mg/L;Zn2＋对唐鱼初孵仔鱼24、48h LC50分别为72.44mg/L和25.17mg/L,其安全浓度为0.9116mg/L;Cd2＋对唐鱼初孵仔鱼24、48h LC50分别为36.5mg/L和20.59mg/L,其安全浓度为1.9654mg/L。结果表明,重金属元素对唐鱼胚胎和初孵仔鱼毒性依次为Cu2＋〉Cd2＋〉Zn2＋。

Safety assessment and acute toxicity of copper,zinc and cadmium to the embryo and larval fish of Tanichthys albonubes

The acute toxicity of copper（Cu2＋）,zinc（Zn2＋） and cadmium（Cd2＋） to the embryo and larval fish of White Cloud Mountain Minnow（Tanichthys albonubes） was studied with the static test method.The results showed that the LC50 of 12 and 24 h for Cu2＋ to the embryo were 2.4092 and 0.4039 mg/L,respectively;the LC50 of 24 h for Zn2＋ and Cd2＋ to the embryo were 372.9 and 50.0 mg/L,respectively.The LC50 of 12,24 and 48 h for Cu2＋ to larval fish were all 0.3228 mg/L,and the safe concentrations of Cu2＋ was 0.0986 mg/L.The LC50 of 24 and 48 h for Zn2＋ to larval fish were 72.44 and 25.17 mg/L,respectively,and the safe concentrations of Zn2＋ was 0.9116 mg/L.The LC50 of 24 and 48 h for Cd2＋ to larval fish were 36.5 and 20.59 mg/L,respectively,and the safe concentrations of Zn2＋ was 1.9654 mg/L.The results indicated that the toxicity sequence of three heavy metals to the minnow was CuCdZn.