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《Journal of Fishery Sciences of China》 2010-05
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Isolation of Photobacterium damselae subsp.piscicida from diseased golden pompano(Trachinotus ovatus Linnaeus) and its drug sensitivity

WANG Ruixuan1,FENG Juan1,SU Youlu1,LAN Xiangbin2,WANG Jiangyong1(1.South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Guangzhou 510300,China;2.American Soybean Association Shanghai Office,Shanghai 200336)  
An epizooty occurred among cultured golden pompano(Trachinotus ovatus)with high mortality in Linshui of Hainan province,China in 2006.Diseased fish exhibited no obvious symptom,though pathological observation showed gray nodules scattered in spleen and kidney.A Gram-negative bacterium(designated strain TOS1)was isolated from its spleen.Pathogenicity assays revealed that TOS1 was virulent to golden pompano when it was challenged by intraperitoneal injection and the LD50 was 1.1×106CFU/g.The 16S rRNA sequence of TOS1 demonstrated high similarity(99%)with Photobacteriumdamselae subsp.piscicida.Phylogenetic analysis results also indicated close genetic relationship between strain TOS1 and P.damselae subsp.piscicida.Additionally,morphological,physiological and biochemical results verified the identification result.The pathogen had strong hemolytic and protease activity and was sensitive to norfloxacin(10μg/tablet),profloxacin(5μg/tablet),gentamicin(10μg/tablet),sulfamethoxazole/trimethoprium(1.25/23.75μg/tablet),neomycin(30μg/tablet),streptomycin(10μg/tablet),chloramphenico(30μg/tablet)and tetracycline(30μg/tablet),and very sensitive to two Chinese herbal medicincs of psidium guajava and atractylodes lancea(MBC=10-6g/mL).
【Fund】: 中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金项目(2008TS08 2009TS06)
【CateGory Index】: S943
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