Aeromonas shuberti as a cause of multi-organ necrosis in internal organs of Nile tilapia, Oreochromis niloticus
文献类型： 外文期刊
作者： Liu, C. 1 ; Chang, O. Q. 1 ; Zhang, D. F. 1 ; Li, K. B. 1 ; Wang, F. 1 ; Lin, M. H. 2 ; Shi, C. B.; Jiang, L.; Wang, Q 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Key Lab Aquat Anim Immune Technol Guangdong Prov, Pearl River Fisheries Res Inst, Key Lab Fishery Drug Dev,Minist Agr, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Fishery Sci, Key Lab Aquat Anim Immune Technol Guangdong Prov, Pearl River Fisheries Res In
关键词： Aeromonas schubertii; infection; nile tilapia; Nodules; pathogenicity
期刊名称：JOURNAL OF FISH DISEASES （ 影响因子：2.767； 五年影响因子：2.689 ）
ISSN： 0140-7775
年卷期： 2018 年 41 卷 10 期
页码：
收录情况： SCI
摘要： A disease with white spots in internal organs of Nile tilapia occurred in Zhanjiang, southern China. Multiple, white nodules, 0.8-2.2mm in diameter, were scattered throughout the liver, spleen and kidney of diseased fish. Signs of nodules reproduced after artificial infection with the isolated strain. Isolated bacteria were Gram-negative, facultative anaerobic, motile, short rod-shaped, with a length of 1.2-2.2m. Morphological and biochemical tests, as well as phylogenetic analysis, all strongly indicated that the isolate from tilapia is identical to Aeromonas schubertii (A.schubertii) which temporary named LF1708 strain. Antibiotic sensitivity assays showed the LF1708 is sensitive to 24 of 27 tested antibiotics. Pathogenicity test revealed that the isolate at the dose of 3.75x10(6) CFU/g killed 100% of experimental tilapia within 2days and the dose of 1x10(7) CFU/g killed 100% of experimental zebrafish within 1day. Histopathology of diseased tilapia infected with A.schubertii showed numerous necrotic lesions widely distributed in spleen, liver and kidney, and infiltration with a large number of bacteria. To our knowledge, this was the first report that associated A.schubertii with mortality in tilapia.
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