光线是钉螺的生活条件之一。最适宜照度为3600～3800Lux,钉螺不喜全暗环境。有些学者断定,阴沟内无钉螺孳生。可是,我们于1988年在两条阴沟内发现有钉螺孳生。 1988年4月下旬,专业队伍对朱家角镇河道监测查螺中,在漕港河南岸西段发现一水码头有钉螺,0.66m~2内捕活钉螺57只,螺点位于一条阴沟出口 Light is one of the living conditions for snails. The most suitable illumination is 3600 ~ 3800Lux, snails do not like the dark environment. Some scholars have concluded that there is no snail in the gutter. However, in 1988, we found snail breeding in the two furrows. In late April 1988, a team of professionals conducted a survey on the river snorkelling in Zhujiajiao Town. In the western section of the southern bank of Cao Gang River, there was a snail, and 57 snails were caught within 0.66m ~ 2. The snail point was located at a culvert outlet