Epizootics of saprolegniasis occurred in 20 to 60 g freshwater-cultured coho salmon (Oncorhynchus kisutch) in Miyagi Prefecture, Japan. Cotton-like mycelia occurred on the body surface of infected fish, especially around the head, the adipose fin and the caudal fin, and aseptate hyphae occurred in the lesions. The hyphae also penetrated into the muscle and blood vessels. The isolated fungus was identified by asexual morphological characteristics as Saprolegnia parasitica (syn. S. diclina Type 1), a known salmonid fish pathogen.
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Vol. 28 • No. 4