During a parasitological survey in Lake Qarun, 140 fish of Mugil cephahts were investigated for protozoan ectoparasites. Three trichodinid species were found on gills of the investigated fish. These species are; Trichodina lepsii Lorn, 1962 ; T. puytoraci Lorn, 1962 and T. batala AH, 1996, Comparative descriptions are presented for the recorded species. The present study proved that the stocking process of the lake is the main source for the recorded trichodinids. Moreover, the study recommended quarantine measures for the stocking fry before releasing into the water bodies. .