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目的了解氯硝柳胺乙醇胺盐对长江湿地生物的影响,为钉螺控制措施的环境影响评价提供科学依据。方法选择长江下游南京段中华绒毛蟹、克氏原螯虾、淡水糠虾和铜锈环棱螺作为受试生物,观察不同浓度氯硝柳胺乙醇胺盐浸泡后受试生物的死亡情况,计算受试生物死亡率和LC50。结果克氏原螯虾在氯硝柳胺乙醇胺盐400 mg/L浓度浸泡96 h仅死亡1只,死亡率为8.33%;中华绒毛蟹在氯硝柳胺乙醇胺盐640 mg/L浓度浸泡96 h无死亡;氯硝柳胺乙醇胺盐对淡水糠虾24、48、72、96 h的LC50分别为2.170 4、1.303 6、1.013 1、0.720 5 mg/L;对铜锈环棱螺24、48、72 h的LC50分别为1.173 5、0.642 1、0.477 3 mg/L。结论氯硝柳胺乙醇胺盐对湿地生物影响不同,中华绒毛蟹和克氏原螯虾对氯硝柳胺乙醇胺盐有较强的耐受性;氯硝柳胺乙醇胺盐对铜锈环棱螺和淡水糠虾毒性较大。
Objective To understand the influence of niclosamide ethanolamine on the biology of the Yangtze River wetland and provide a scientific basis for the environmental impact assessment of the snail control measures. Methods The Chinese crab, Procambarus clarkii, Myxoma crayfish and Prorocentrum biloba were selected as tested organisms in the Nanjing section of the lower reaches of the Yangtze River. The mortality of the tested organisms after different concentrations of niclosamide ethanolamine salt was observed. Mortality and LC50. Results There were only 1 death in Procambarus clarkii treated with niclosamide ethanolamine 400 mg / L for 96 h, with a mortality rate of 8.33%. While C. sinensis was immersed in niclosamide ethanolamine 640 mg / L for 96 h The LC50 of niclosamide ethanolamine salt to freshwater shrimp at 24, 48, 72, 96 h were 2.170 4, 1.303 6, 1.013 and 1.0720 5 mg / L, respectively; The LC50 was 1.173 5,0.642 and 1,0.477 3 mg / L, respectively. CONCLUSIONS The effects of niclosamide ethanolamine on wetland biomass are different. Chlorococcum crayfish and Procambarus clarkii are more tolerant to niclosamide ethanolamine salt; niclosamide ethanolamine salt is more effective against Cucurbitaceae and freshwater chaff Shrimp toxicity is larger.