Aeromonas salmonicida ssp. salmonicida lacking pigment production, isolated from farmed salmonids in Finland

Abstract

Strains of Aeromonas salmonicida ssp. salmonicida lacking pigment production were isolated from brown trout Salmo trutta m. lacustris and sea trout S. trutta m. trutta cultivated in fresh water in south Finland. The bacteria isolated showed only minor deviations in biochemical characteristics compared to 2 strains of A. salmonicida ssp. salmonicida and the type strain of A. salmonicida ssp. salmonicida (NCMB 1102). Several characters differed when compared to the type strain of A. salmonicida ssp. achromogenes (NCMB 1110). In challenge experiments, the strain tested was highly pathogenic to rainbow trout Oncorhynchus mykiss .