硫酸锌对4种水生动物的急性毒性作用

采用急性毒性实验方法测试了硫酸锌对中华绒螯蟹(Eriocheir sinensis)仔蟹、克氏原螯虾(Procambarus clar-kii)幼虾、异育银鲫(Carassius auratus gibelio♀×Cyprinus carpiovar.singuonensis♂)幼鱼及田螺(CipangopaludinachinensisGray)4种常见淡水经济养殖动物的半致死浓度(LC50)及安全浓度。结果显示:中华绒螯蟹仔蟹24、48、72、96 h LC50(Zn2+)分别为18.39、11.10、7.63、5.84 mg/L;克氏原螯虾幼虾分别为84.48、16.50、4.78、2.60 mg/L;异育银鲫幼鱼分别为46.51、33.43、23.86、19.58 mg/L;田螺分别为89.34、56.33、38.90、34.23 mg/L。安全浓度分别为0.58、0.26、1.96、3.42 mg/L。实验过程中,随着实验水体中锌浓度的增加,4种动物表现不同程度的中毒症状,死亡率增加;同一浓度,死亡率随着暴露时间延长增高。另外,相对异育银鲫幼鱼和田螺,中华绒螯蟹仔蟹、克氏原螯虾幼虾对硫酸锌毒性较敏感。

Acute toxicity of zinc sulphate on four hydrocoles in fresh water

Acute toxic effects of zinc sulphate on four common hydrocoles in fresh water aquaculture and safe concentration were investigated.The LC_(50)(Zn~(2+)) on juvenile Eriocheir sinensis,larva Procambarus Gray at 24 h,48 h,72 h and 96 h were 18.39 mg/L,11.10 mg/L,7.63 mg/L and 5.84 mg/L;84.48 mg/L,16.50 mg/L,4.78 mg/L and 2.60 mg/L;46.51 mg/L,33.43 mg/L,23.86 mg/L and 19.58 mg/L;89.34 mg/L,56.33 mg/L,38.90 mg/L and 34.23 mg/L respectively.The safe concentration was 0.58 mg/L,0.26 mg/L,1.96 mg/L and 3.42 mg/L respectively.The results appeared the E.sinensis and P.clarkii were more sensitive to zinc sulphate compared to juvenile allogynogenetic crucian carp and C.chinensis Gray.