Abstract: Objective To understand the eco?hydraulics characteristics of Biomphalaria straminea， the intermediate host of Schistosoma mansoni. Methods The drainage method and settlement tube method were applied to measure B. straminea’s density and hydrostatic settling velocity respectively. Results The density of B. straminea was 1.04-1.16 g/cm3， and the average value was 1.08 g/cm3. The hydrostatic settling velocity was 2.32-12.92 cm/s. Conclusions The eco?hydraulics characteristics of B. straminea is different from Oncomelania hupensis， and more attention should be paid to the hydraulic measures for the control of B. straminea.

Key words: Biomphalaria straminea； Density； Hydrostatic settling velocity； Spread

摘要： 目的 了解曼氏血吸虫的中间宿主藁杆双脐螺的生态水力学特性。方法 采用排水体积法和沉降管法分别测定了双脐螺的密度和静水沉速。结果 藁杆双脐螺的密度在1.04~1.16 g/cm3之间，平均密度为1.08 g/cm3；其静水沉速在2.32 ~ 12.92 cm/s之间。结论 藁杆双脐螺的生态水力学特性与钉螺有所不同，在研究采用水利措施防控藁杆双脐螺扩散中应考虑其特性。

关键词: 藁杆双脐螺；密度；静水沉速；扩散