[Formation and Characteristics of Fasciola hepatica Metacercariae].

Abstract

The Fasciola hepatica miracidia were used to infect 10 Galba pervia in a random manner. Beginning from day 44 after infection on which 10 metacercariae were found and a total of 495 metacercariae found in 24 days. No signs of cercaria escape or metacercaria formation in the early morning observed during 8 : 00-24 : 00, regardless of the environmental change. Metacercaria formation occurred mainly in the early morning. The metacercariae could attach to any object in water, but were easy to detach themselves. The findings suggest that F. hepatica cercaria escape and metacercaria formation mainly occur in the early morning in Dali.