Microscopic Examination Of The Tissues From Wild Brown Trout With Ulcerative Dermal Necrosis (Udn) Syndrome Caught In The Så Upia River In Poland

Abstract

he pathological changes in the majority of the cases seemed to be associated with fungal infections, limited to the skin, which has been reported in previous years in salmonids. The increased intensity of the changes in the trout from 2022 might indicate a more complex pathogenesis of the disease.