輸送中あるいは輸送後飼育中に起きる魚の斃死に関する細菌学的研究-III : 斃死魚から分離した病原菌の性状および薬剤に対する感受性

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In the previous study, numerous organisms were isolated from livers of red sea bream, Chrysophrys major, fingerlings which had died during culture after transportation, and the isolates were classified into thirteen groups on the basis of certain characteristics. The bacteria belonging to groups V and X showed pathogenicity in fish. In the following study, the bacteria belonging to group V were identified as Vibrio anguillarum-like bacterium K-3, based on their morphological and biochemical characteristics. The present paper deals with the characteristics and the sensitivity to bacteriostats of the bacteria in group X. The results obtained can be summarized as follows: 1. The bacteria are evidently Vibrio species, according to the presumptive identification of pathogens of fish by BULLOCK. 2. The morphological and biochemical characteristics of bacteria resemble those of V. anguillarum type B introduced by NYBELIN, excepting one characteristic, namely, the non-liquefaction of gelatin. The bacteria also resemble V. pierantonii in terms of some characteristics, especially the non-liquefaction of gelatin and the non-production of indole. 3. The bacteria grew well in the nutrient broth containing 1 to 5% sodium chloride. The optimal growth in a medium with a 3% NaC1 level was observed in the temperature range of 20 to 35°C and in the pH range of 5 to 9. 4. The bacteria are most sensitive to chloramphenicol among all the drugs used.
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輸送中あるいは輸送後飼育中に起きる魚の斃死に関する細菌学的研究-III : 斃死魚から分離した病原菌の性状および薬剤に対する感受性

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