Abstract:
The Mystus nemurus and also known as River Catfish were cultured in cages at Sungai Terengganu. The parasites that infected this species of fish are Platyhelminthes or flatworms, subclass the Digenea of the class Trematode. The digenea is an ndoparasites that have complex life-cycle and can infect fish as intermediate host or definitive host. 30 of River Catfish were examined and the investigated organs were stomach and intestine. This is because the parasite can be found in large number in the intestine and rectum of the fish. The digenean that infected the Mystus nemurus was studied and the morphology was examined to determine the family of the digenean and identify up to genus. The order is Plagiorchiida, superfamily is Opisthorchioidea, family is Heterophyidae, and the genus is Euhaplorchis. The prevalence of River Catfish that infected by these species are 93.33% and the mean intensity are 14.07. The infection of this species influence by many factors such as age of the host, season and population size of the host.
