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In 127 specimens of grayling Thymallus thymallus (LINNAEUS, 1758) originating from three rivers: Łeba, Reda and Radunia and caught between 1992 and 1994, 8694 parasite individuals (apart from Protozoa) were found, belonging to 11 species (including one genus determined). Among them Trichodina sp., Ichtyophthirius multifiliis, Plagioporus stefanskii were first ever revealed in grayling. In Poland it...
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