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目的观察新型纳米银复合生物灭螺剂野外实地灭螺效果,及其对水生物的毒性影响。方法选择安徽省池州市秋浦河下游河滩为研究现场,挖掘4个1 m3的水池,分别设纳米银复合生物灭螺剂300 g/m3组和600 g/m3组、50%氯硝柳胺乙醇胺盐2 g/m3组、天然水对照组,同时向各水池分别投入100只钉螺、100尾鲫鱼苗。采用浸杀法,定期观察同一环境条件下各组灭螺效果,以及2种不同药物的鱼毒性影响。结果纳米银复合生物灭螺剂600 g/m3组和300 g/m3组钉螺死亡率分别在第7 d和第14 d达到100%,2种剂量的鱼苗死亡率均为6%;氯硝柳胺组在第3 d的鱼苗死亡率为100%,第7 d时钉螺死亡率为100%;对照组第7 d钉螺死亡率为7%,第14 d为14%,鱼苗死亡率为22%。结论新型纳米银复合生物灭螺剂具有良好的灭螺效果,而且对水生动物的生长基本无毒性影响,有望作为一种新型高效环保型生物灭螺剂推广应用。
Objective To observe the field snail control effect of new nanosilver compound biological molluscicide and its toxicity to aquatic organisms. Methods Four floodwater pools of 1 m3 were excavated in the lower reaches of Qiu Pu River, Chizhou City, Anhui Province. Three hundred and three hundred g / m3 and 600 g / Salt 2 g / m3 group, natural water control group, while each pool were put into 100 snails, 100 carp fry. By immersion method, the effect of snail elimination in each group under the same environmental conditions and the fish toxicity of two different drugs were observed regularly. Results The mortality rates of snails in the 600 g / m3 and 300 g / m3 groups of nanosilver composite biotic molluscicide reached 100% on the 7th and the 14th day, respectively, and the mortality rates of the fry of the two dosages were both 6% The mortality of the fry in the amine group was 100% on the 3rd day, and the mortality of Oncomelania snails was 100% on the 7th day. In the control group, the mortality of Oncomelania snails was 7% on the 7th day, 14% on the 14th day and 22% . Conclusion The new nanosilver composite biological molluscicide has a good effect of snail elimination and has basically no toxicity to the growth of aquatic animals and is expected to be promoted and applied as a new type of highly efficient and environmentally friendly biological molluscides.