Cercarial infection in Paludomus petrosus, freshwater snail in Pa La-U Waterfall.

摘要: Paludomus petrosus, the freshwater snails found in Pa La-U Waterfall, were examined for cercarial infection of trematodes. The collected every other month from April, 2001 to February, 2002. Collections taken two sampling stations. counts per unit time' method was used collection snails. density highest June 2001, and parasite rate February Four types cercariae snails: Xiphidiocercariae, Amphistome, Furcocercous type I, II. Xiphidiocercariae April I II