A total number of 400 Oreochromis niloticus (Tilapia nilotica) were investigated for parasitological studies on various encysted metacercariae of digenetic trematodes in different body parts of the examined fish specimens in Assiut Governorate.The total prevalence of infected Oreochromis niloticus with different encysted metacercariae was 84.75%.They were differentiated into two types: The first t...