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《CHINESE JOURNAL OF ZOOLOGY》 1994-06
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EXPERIMENTAL STUDY ON SNAIL AND ITS EGG DROPPING MOVEMENT IN STABLE WATER

YANG Xianxiang; XU Xingjian; YU Chuan hun(Hubei Institute of Schiatosomiasis Control Wuhan 430070)PAN Qingshang; ZHANG Wei; XIONG Zhengan(Science Institute of the Yangtze River)  
The biological and physical characteristics and parameters of movement form,direction and dropping speed in stable water were obtained for the snail, Oncomelania hupensis, with the test of dropping tube and large sample bottle. The theoretic basis of the study is combination hydraulics, silt movement mechanics and the snail biology. The results are as following: 1) The average specific gravity of live snail is 1.8g/cm3. 2) The average specfic gravity of snail egg is 2.29g/cm3. 3) The range of average value of dropping speed of the snail and its egg is from 2.22 to 13.89 cm/s.Meanwhile, four practice formulas of dropping speed of the snail and its egg were developed based on measured data and Newton formula of rounding current block. The resulats would lay a foundation for study of preventing the snail spread and also provide the calculating method and practice parameter for design projeet which will prevent snail from spreading.
【CateGory Index】: R384.9
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