STUDY ON REGULAR PATTERNS OF MOVE AND DIFFUSING OF ONCOMELANIA SNAILS IN RIVERS WITH CEMENT BANKS / 中国血吸虫病防治杂志

ABSTRACT

Objective To probe into regul ar patterns of move and diffusing of Oncomelania s nails in rivers with cement banks and determine the control strategy. [WT5 ”HZ]Methods The part of Sunan Canal from the estuary to Xin feng Railway Bridge was taken as the experimental zone. The revival of snail spo ts destroyed before the canal dredging, snail status on cement banks, snails on obstacles, floaters and ships in the rivers and floating snails were investigate d and compared with the situations before the dredging. Results Twelve destroyed snail spots were investigated and two of them presented snails, apart from the estuary 3.2 km and 4.3 km. The rate with sna il s on obstacles in frame in the rivers was 0, significantly lower than the 87% be fore the dredging(P