关键词: 钉螺, 幼螺, 孵化

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