Abstract
An epizootic of the fungal infection saprolegniosis that occurred in freshwater-cultured salmons and their eggs at some hatcheries in Hokkaido (Japan) was investigated. In almost all cases, the initial clinical sign was characterized by the growth of cotton-like mycelia on the fishs' body surface, especially the head, adipose fin, and caudal fin, but the mycelia were not visible to the naked eye in the internal organs. Thirty-three strains isolated from lesions were classified in the genus Saprolegnia according to their morphological and biological characteristics on hemp seed cultures at various temperatures. Fifteen of the strains were identified as Saprolegnia parasitica, 16 were identified as S. salmonis, and two were identified as S. australis.
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