EN
The aim of work was settlement of occurrence of pathogenic fungus Trichosporon cutaneum in diverse ecological environments. Object to investigations farmer river Węgorapa, Supraśl, lakes of complex Mamry and Sejny group, of cultivation ponds in Popielewo and in Poryte Jabłoń a few springs of city Białystok. In investigations one used method of baits to isolated water fungus. Quality of waters determined by physico-chemistry methods. One fixed, that pathogcnic fungus Trichosporon cutaneum stepped out in waters north-east evn Poland on all investigated sites. It was developed in both strong poluted water of lakes and ponds also in good oxygened waters and springs it was too.