Infection by Capriniana piscium (Buetschli, 1889) Jankovski, 1973, a cause of rainbow trout (Oncorhynchus mykiss) kill

The aim of this contribution is to describe an infection by the ciliate ectocommensal Capriniana piscium as a possible cause of rainbow trout (Oncorhynchus mykiss) kill in an intensive culture. A relatively dense stock (12-14.5 kg m super(-3)) combined with unfavourable physical and chemical parameters of water in rearing troughs are described as predisposition factors for the outbreak of the infection. A period of several days of a high water temperature (i.e. 20-21.4 degrees C), along with a higher pH and a lower oxygen concentration, is considered the main predisposition factor for rainbow trout capriniosis. Bacteriological, virological and parasitological examinations did not Suggest involvement of any other component cause of this infection.