Bioecology of some ectoparasites of fish in artificial water reservoirs of Kabardino-Balkaria

Features of bioecology of ectoparasites in commercial fish in fish farms of Kabardino - Balkaria are studied. Monthly examination of 6 species of fish, in par- ticular of fish scale, muscular tissue and gills with respect to ectoparasite infection is conducted. Susceptibility of pond fish to trichodyna infection is determined. Dif- ferent intensity of ectoparasite invasion (II) in different species of fish is defined. Parasites Trichodina and Trichodinella are registered in common carp (European carp) at invasion intensity (II) 50 and more expl./fish, in Chinese carp - 27-60, in bighead and silver carp - 3-18, in Sevan trout - 1-20 expl./fish. It is pointed out that Trichodina nigra and Trichodinella epizootica dominated among ectoparasites