Abstract
In 1994, a mass mortality occurred among 0 and 1-year-old Schlegel's black rockfish (Sebastes schlegeli) cultured in the eastcoast of Okayama Prefecture. The affected fish were characterized by ulcer formed on the trunk. A bacterium was isolated from the kidney and brain of diseased fish and identified as atypical Aeromonas salmonicida by its biochemical and serological properties. Infection experiments showed that the present isolate was highly pathogenic to black rockfish, the LD50 being 1.1×10°CFU/fish by intramuscular injection or 4.4×105CFU/ml by immersion method.
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