Fasciola gigantica Cobbold 1856 in the snail

Abstract

The development of Fasciola gigantica from miracidial penetration to the 85th day was observed in experimentally infected Lymnaea natalensis reared and kept in a laboratory in Kenya at ambient temperature. Contrary to previous accounts, the miracidium was found to metamorphose directly into a first-generation redia during the first 4 days. About the 16th day, the redia migrated to the snail liver. 2nd-generation rediae gave rise to 3rd-generation rediae and/or cercariae by the 45th to 50th day. The release of cercariae from 3rd-generation rediae began around the 75th day, and from 4th-generation rediae after 85 days. [AS].