Aeromonas salmonicida has been recognized as a pathogen of fish for over 100 years. Emmerich and Weibel 1894 made the first authentic report of its isolation during a disease outbreak at a Bavarian brown trout hatchery, the manifestations of the disease including furunclelike swelling and, at a later stage, ulcerative lesions on infected trout. Since that time a number of subspecies of A. salmonicida have been recognized, although the taxonomy of the species is far from settled. Aeromonas salmonicida is one of the most studied fish pathogens, because of its widespread distribution, diverse host range and economically devastating impact on cultivated fish, particularly the salmonids.

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