The scales on the affected areas were raised, and the skin thickened. On post-mortem examination, 7/21 had up to 75% to 90% of the skin surface affected with bilateral, focally extensive white to grey, rough patches. Twenty-one rainbow trout were submitted for diagnostics to the Institute for Fish and Wildlife Health, University of Bern, Switzerland. In February 2022, rainbow trout from a mountainous fish farm in Switzerland showed lethargy, inappetence, white to grey patches on the skin and slightly increased mortality. Typically, the prevalence and severity of PSD increase during the summer and autumn months (13☌ – 15☌). Since then, cases have increased significantly, with additional reports in still water fisheries. PSD was first reported in 2002 in fish farms in England. However, aetiology remains unknown so far. Because of its horizontal transmission, an infectious aetiology was hypothesised. ![]() Puffy skin disease (PSD) is an economically important syndrome in rainbow trout, Oncorhynchus mykiss (Walbaum, 1792).
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