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作者在苏丹坎瑞拉现场进行了以指甲油标记螺蛳的试验。实验方法:在现场捕捉法氏双脐螺(B.Pfeifferi),筛去阳性螺,选≥7mm的阴性双脐螺供标记用。标记方法分两步,先在离壳口2mm处扎一个小眼,然后在双脐螺的中心螺旋的一侧或两侧涂一小块红色或白色或金黄色的指甲油。壳口处扎眼是为了考核标记螺上的指甲油是否剥落。标记螺投放地点:水流缓慢的灌溉渠道中的一段回流处。螺蛳回收方法:于螺蛳投放后不同时间(10天和5天),在投放点的上下游各5米内,用金属网兜取20勺水样,再计数螺蛳。
The authors conducted a test of nail polish with snail oil at the site of Canilla, Sudan. Experimental methods: Capture B.ffeifferi in the field, screened positive spiral, selected ≥ 7mm negative double umbilical snails for marking. Mark the method in two steps, first pinch a small eye 2mm away from the mouth of the shell, and then apply a small piece of red or white or golden nail polish on one or both sides of the center of the double umbilical spiral. Shell mouth at the mouth to check whether the nail snail nail flake. Marking screw placement: a slow flow of irrigation channels in a section of reflux. Lo snail recycling method: At different times (10 days and 5 days) after the snails were put into operation, 20 tablespoons of water samples were taken from the upper and lower reaches of the dropping point with a metal mesh bag, and the snails were counted again.