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Vibrio metschnikovii, a Potential Pathogen in Freshwater-Cultured Hybrid Sturgeon

文献类型： 外文期刊

作者： Xiao, Zidong 1 ; Li, Xudong 3 ; Xue, Mingyang 1 ; Zhang, Mengwei 1 ; Liu, Wei 1 ; Fan, Yuding 1 ; Chen, Xihua 1 ; Chu, Zhipeng 1 ; Gong, Feilong 4 ; Zeng, Lingbing 1 ; Zhou, Yong 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China

2.Huazhong Agr Univ, Coll Fisheries, Dept Aquat Anim Med, Wuhan 430070, Peoples R China

3.Henan Fishery Tech Extens Stn, Zhengzhou 450008, Peoples R China

4.Zhengzhou Fishery Tech Extens Stn, Zhengzhou 450006, Peoples R China

关键词： aquaculture; biochemical identification; histopathology; hematological parameters; drug sensitivity

期刊名称：ANIMALS （ 影响因子：3.231； 五年影响因子：3.312 ）

ISSN： 2076-2615

年卷期： 2022 年 12 卷 9 期

页码：

收录情况： SCI

摘要： Simple Summary In an era of shrinking stocks and intensive fisheries production, pathogenic microorganisms are a serious threat to fish health. This study confirms that Vibrio metschnikovii-a pathogen mainly found in aquatic environments-was the pathogenic bacterium causing disease in hybrid sturgeon. The authors reveal the hazard of V. metschnikovii to hybrid sturgeon and the potential risks to the sturgeon farming industry. In July 2021, a disease with a high mortality rate broke out in freshwater cultured hybrid sturgeon in Zhengzhou, Henan Province. A dominant strain, H-701, was isolated from diseased fish; physiological changes in diseased fish were investigated and molecular identification, biochemical characterization, and pathogenicity and drug sensitivity tests of H-701 were performed. The 16S rRNA gene sequence of H-701 was 99.86% homologous with that of Vibrio metschnikovii in GenBank. The 50% lethal dose of H-701 was 3.72 +/- 0.929 x 10(4) CFU/g fish weight. The proportion of monocytes, neutrophils, and eosinophils in the blood of diseased sturgeon increased significantly, whereas the proportion of lymphocytes decreased. In diseased fish, the serum levels of total protein, albumin, globulin, and alkaline phosphatase decreased significantly, and those of aspartate aminotransferase, alanine aminotransferase, and complement C3 increased significantly. There were obvious pathological changes in several tissues of the diseased fish. H-701 was sensitive to antibiotics such as florfenicol, enrofloxacin, and doxycycline. This study not only demonstrated that V. metschnikovii was the cause of death of a large number of hybrid sturgeon but also revealed its potential risk in hybrid sturgeon aquaculture. The results provide a basis for the diagnosis and prevention of this disease.

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