论文部分内容阅读
过去不少调查证明,湖区有螺草洲,灭螺后效果不易巩固,其原因之一可能与洪水季节大量幼螺从别处漂浮扩散而来有关。掌握幼螺的活动规律,对于指导湖区灭螺具有实际意义。为此我们于1976年5、6月份,就幼螺浮游习性作了如下实验观察。
Many surveys in the past have proved that one of the reasons why snail bushes in the lake region are not easy to consolidate after the snail control is one of the reasons that may have something to do with the large number of snail blooms elsewhere during the flood season. Grasping the activity of snails has practical significance for guiding snail control in the lake area. For this reason, we made the following experimental observations on juvenile snail floating habit in May and June 1976.