Seasonal changes of contamination of fish-introduced species invasive types of helminths and bacteria in fish-breeding farms of Belarus

Abstract

He article presents data on the infection of introduced fish by invasive species of bacteria (Shewanella putrefaciens and Aeromonаs hydrophila) and helminths (Khawia sinensis (Hsü, 1935), Bothriocephalus acheilognathi (Yamaguti, 1934), Philometroides lusiana (Vismanis, 1966) = Sуn. Philometroides cyprini (Ishii, 1931) in fish farms of Belarus. Seasonal changes in the infection of fish by causative agents of helminthiasis and bacterial infections typify two species of bacteria (Sh.putrefaciens and A. hydrophila) and one species of helminths (Kh.sinensis). The maxima of frequency index for A. hydrophila were noted in april (80,0 %), for Sh. putrefaciens - in june (33,0 %). Contamination of the cestode Kh. sinensis in common carp reaches its maximum in the summer, this is because intermediate hosts of this type of helminth are characterized by high number of infected with Khawia