Spontaneous mycosis caused by Aureobasidium pullulans is documented in roach in a cyprinid-prevalent water reservoir in Czechia. Gross pathological lesions included pale gills and splenomegaly, as revealed during necropsy examination. Histological examination showed extensive foci with fungal elements in the kidney. The isolated fungus was identified through phenotypic and molecular characterization, including phylogeny. This report represents the first case of A. pullulans infection in fish and cold-blooded vertebrates, to the best of our knowledge.

Department of Botany Faculty of Science Charles University Benatska 2 128 00 Prague 2 Czech Republic

Department of Zoology Silesian Museum Nadrazni okruh 31 746 01 Opava Czech Republic

Laboratory of Fungal Genetics and Metabolism Institute of Microbiology of the Academy of Sciences of the Czech Republic v v i Videnska 1083 142 20 Prague 4 Czech Republic

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