Abstract: Objective To study the relationship between the number of Oncomelania hupensis and hatching of young snails, and to provide a scientific basis for the prevention and control of O. hupensis in Shanghai. Methods A total of 20 patches of soil were taken from the field where there existed O. hupensis from May to September, 2016 at Qingpu district, Shanghai, by systematic sampling and environmental sampling. Three patches of soil which weighed 500 g per unit were taken from each of the 20 patches of soil to count O. hupensis in the soil. After hatching which lasted 73 days, the soil was washed by a two-layer sieve, and then the number of the snail eggs which were not hatched was counted. Log-linear regression was used to explore the relationship between the number of adult snails and the number of young snails, and the paired χ² test was used to statistically analyze the water for hatching. Results The hatchability of O. hupensis was 86.72% in each patch of soil weighing 1 500.00 g. There was no logarithmic linear relationship between adult snails and young snails in each patch of soil weighing 1 500.00 g (y=18.894+14.759ln(x), F=2.202, P=0.155). Also, no significant difference in the positive rate of snails in soil was observed when using running water or deionized water as a control (χ²=10.000, P=0.219). Conclusion The soil in the field where there existed O. hupensis could transmit snails, so actions should be taken to avoid the transmission; otherwise, new snail habitats would arise.

Key words: Oncomelania hupensis, Young snail, Hatching

摘要： 目的 研究有螺地区土壤中钉螺数量与幼螺孵化关系，为钉螺防控寻找科学依据。方法 2016年5-9月采用系统抽样结合环境抽查法采集上海市青浦区有螺地区土壤20块，每块土壤分别抽取3份（每份500.00g）样品，对土壤样品中钉螺计数并进行73 d孵化实验后捡出幼螺。孵化后的样品，用双层箩筛水洗获得筛取物，进行未孵化螺卵计数。采用对数线性回归方法对成螺和幼螺孵化关系进行分析，配对χ²检验用于不同水质对孵化率影响的分析。结果 抽取到的1 500.00 g有螺土壤样本钉螺孵化率为86.72%，成螺数与孵化出的幼螺数无对数线性关系[y=18.894+14.759ln （x），F=2.202，P=0.155]；分别采用自来水和去离子水孵化，两组孵化率差异无统计学意义（χ²=10.000，P=0.219）。结论 有螺地区土壤可作为传播介质引起钉螺传播，因此需要防止有螺地区土壤作为介质传播钉螺，造成新的钉螺孳生地。

关键词: 钉螺, 幼螺, 孵化