【摘要】 目的　了解钉螺在水体中的运动状态。　方法　采用钉螺生物学与水力学以及河流泥沙工程学相结合的方法 ,观察钉螺运动状态。　结果与结论　钉螺的爬行能力很低 (最大爬速每分钟仅 2 .98cm) ,其在江河沟渠中的自身运动可忽略不计 ,但在阻 /灭螺工程中设计沉降池时必须考虑钉螺的自身运动。钉螺在江河沟渠水流中的运动状态主要表现为 :1吸附于载体随水漂流 ;2作为悬移质随水流推动移行 ,其主要来自湖沼地区大量有螺洲滩随水流启动的、以及沉降在河床床面上的重新启动的钉螺 ,均为 7周龄以下的幼螺 ,因其吸附力较小而易失散。螺龄较大的野外钉螺平均吸附力为其体重的 13倍 ,不易失散。更多还原

【Abstract】 Objective To understand the moving patterns of Oncomelania snails, intermediate host of S.japonicum, in the water bodies. . Methods. Based on the biological features of the snails, methods and techniques in relation to hydraulics and silt engineering were adopted to investigate the active scrawl ability and passive movement of the snails. . Results and Conclusion . The scrawl speed of the snails themselves was very low, 2.^45 mm per minute only. The active movement in the water current was therefore almost negligible. The major moving patterns of the snails in rivers and canals were that: 1. Snails adsorbed on different kinds of carriers drifted on the water. 2. Snails suspended on the water and drifted with the current, these were the young snails under 7 weeks of age. Adult snail showed a strong ability of adhesion, 12 times higher than its body weight.更多还原