Characteristics of a Pathogenic Mycobacterium sp. Isolated from Cultured Striped Jack, Pseudocaranx dentex.

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An epizootic infection of cultured striped jack, Pseudocaranx dentexwas observed in Tokyo during December 1990 to March 1991. The typical internal symptoms were hypertrophy of the kidney, spleen with tubercles and visceral adhesions. The causative bacterium isolated from the kidney and spleen was Gram-positive short rod. The cells were 0.3-0.4×0.8-1.5μm in size on Ogawa egg medium. Growth occured at 15-33 °C with 0-2.0 % salt concentrations and pHs of 5-9, with optimum growth at 25°C and 0-0.5% salt consentration. The isolated bacterium was niacin and catalase positive, and hydrolyzed Tween 80 after 10 days of incubation. Acid production from mannose, hydrolysis of Tween 80 after 5 days, nitrate reduction, β-galactosidase, iron uptake or nitrate utilization as a source of nitrogen were negative. The mole percent G + C of the DNA from the isolated bacterium ranged from 62.2-63.7%.The morphological, biological and biochemical characteristics of the isolated bacterium were identical toMicobacteriumsp. which has been reported for cultured yellowtail, Seriola quinqueradiata.
日本水産増殖学会の論文