Abstract:
The aim of study was to understand the morphology of metacercariae of Clinostomum sp. found in freshwater fishes in Riau, Indonesia as second intermediate hospes. Freshwater fish were collected from Sail river, identified and examined for morphological observation. Encysted metacercariae of Clinostomum were excysted with a needle, fixed in 10% formalin and stained with Semichon’s Acetocarmine. Clinostomum parasites were observed under a stereomicroscope and numbers recorded. The result showed that infected freshwater fish were identified as Trichogaster trichopterus and prevalence of Clinostomum infection to the fish was17,1%. The infected fish had total length between 5,6-11cm, while the weight range was 2,01-28,64 g. The cysts were 1,5-2 mm in diameter, with a thin (c. 0,9 μm wide). There was no spinae in tegument dan had 2 suckers (oral and ventral), posteriorly located genitalia and paired digestive caeca. This digeneans were identified as the metacercariae of Clinostomum sp. This research is the first case of Clinostomum in freshwater fish in Riau, Indonesia
