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Flexibacter psychroph~lus (syn Cytophaga psych~-ophila) was isolated in Tasmania, Australia, from farmed Atlantic salmon Salnio salar with moderate to severe erosion of the fins; there was no evidence of skin lesions. The mortality level in the population of affected fish was less than 0 01 % wk-l, but the morbidity level was in excess of 8O'Y". The phenotype of the Australian isolates IS in good agreement with strains from Europe and North America and differs only in that the Australian isolates produced a brown pigmentation on tyrosine agar and did not hydrolyse Tween 80. The growth in vitro of all isolates was inhibited by acriflavine, ampicillin, and oxolinic acid at concentrations in excess of 0.5 pg ml' and by oxytetracycline a t 1.56 pg ml-'; none of the isolates were inhibited by sulphamethazine or trimethoprim at 25 pg ml' . KEY LVORDS: Flexibactelpsychroph~lus . Fin rot . Atlantic salmon Salmon salar . Ant~biotic sensitivity Filamentous bacteria belonging to the FlexibacterCytophaga Complex (FCC) are well recognized fish pathogens, with marine and freshwater species capable of causing disease. Flexibacter columnaris has been reported as a pathogen of freshwater fish throughout the world (Austin & Austin 1987), while accounts of E maritimus infection of sea farmed fish have been made in Japan (Wakabayashi et al. 1986), Scotland (Bernardet et al. 1990), and Spain (Alsina & Blanch 1993). Cytophaga psychrophila, re-classified as F: psychrophilus (Bernardet & Grimont 1989), is the agent of coldwater disease in salmonids and may cause a spectrum of pathologies ranging from ulcerative skin necrosis to systemic infection involving major body organs. E psycl~rophilus is the cause of significant levels of mortality in coho salmon Oncorhynchus kisutch

Characteristics of Flexibacter psychrophilus isolated from Atlantic salmon in Australia