Trichodinid ectoparasites (Ciliophora: Peritrichida) of some marine fishes from coastal regions of the Yellow Sea and Bohai Sea

Five species of marine fishes, including two of the main maricultured fishes from coastal regions of the Yellow Sea and Bohai Sea, were examined for ectoparasitic trichodinids. A total of five species of trichodinids belonging to three genera, Trichodina Ehrenberg, 1830, Paratrichodina Lom, 1963 and Trichodinella Sramek-Husek, 1953 were reinvestigated following dry silver impregnation. These were: Trichodina rectuncinata Raabe, 1958, T. jadranica (Raabe, 1958) Haider, 1964, Paratrichodina globonuclea Lom, 1963, P. obliqua Lom, 1963 and Trichodinella lomi Xu, Song & Warren, 1999. Morphometric data and comparative descriptions of these trichodinids are provided along with details of their prevalence and intensity of infestation.