| Summary: | Ulcerated fish of six different species were collected during the BMB/ICES Sea-going Workshop "Fish Diseases and Parasites in the Baltic Sea", 25 November to 8 December 1994, and examined for bacteriological infections. Atypical Aeromonas salmonicida strains were isolated from the majority of the ulcers of dab Limanda limanda, flounder Platichthys flesus, and turbot Scophthalmus maximus. A fast-growing strain was isolated in pure cultures from both ulcers and visceral organs of viviparous blenny Zoarces viviparus. Available data suggest that atypical A. salmonicida is generally involved in the development of ulceration's in Baltic flounder and probably also in other fish species. The strains isolated from ulcerated flounders were indistinguishable from those previously reported from this species from the Baltic Sea and the North Sea, and the ulcer disease is considered to be associated with one, well-defined biotype of A. salmonicida. (C) 1999 International Council for the Exploration of the Sea.
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