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本研究在吴县陆墓公社32段有钉螺的河、沟中进行。研究结果发现河、沟钉螺的检出情况与螺口多少有关,第1次查螺检出的活螺密度与实际活螺密度之间呈线性正相关;在4、5月份作一次全面细查后,一般第1次的检出情况能反映出当时被查河、沟的螺口多少;但螺口密度很低的河、沟(实际活螺密度在每平方市尺0.7只以下)在第1次查螺时可能检不出。又发现螺卵密度与实际活螺密度之间也呈线性正相关。
This study was conducted in a river and ditch with snails in the 32nd section of Ludian Commune in Wu County. The results showed that the detection of snails in the river and gully was related to the number of snails. The live screw density detected from the first snail was linearly and positively correlated with the actual live snail density. In April and May, After the first detection of the general situation can be reflected at that time was chanhe, ditch the screw much; but screw density is very low river, ditch (the actual live thread density in 0.7 per square foot below) in the first 1 check thread may not be detected. Also found spiral egg density and the actual live thread density also showed a linear correlation between.