Abstract
A gill-tuberculosis of cultured yellowtail, Seriola quinqueradiata, which occurred from late autumn of 1971 till the following spring in both Tosashimizu and Tanabe bays are described in the paper.The causal organism was found to be a gram-positive, non-motile rod which occasionally showed branching, and was feebly acid-fast. It was non-sporing, and produced aerial hyphae. Catalase, hydrogensulfide production, starch hydrolysis, and nitrate reduction were positive. Decomposition of hypoxanthine and tyrosin was feebly positive. Tests for oxidase, urease, indole production, gelatin liquefaction, and decomposition of casein and xanthine were negative. It was able to produce acids from glucose, fructose, and glycerol on a medium containing sodium glutamate as the nitrogen source. The organism utilized the acetate, citrate, fumarate, and pyruvate, but not the benzonate, oxalate, propionate, and tartrate on a medium containing diammonium hydrogen phosphate as the nitrogen source. It showed growth neither at 10°C nor 37°C and survived at 50°C for 4 hours in the nutrient broth.On comparison with a strain from nocardiosis of yellowtail it was apparent that the gill-tuberculosis organism was Nocardia kampachi.
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