天津农学院学报 ›› 2022, Vol. 29 ›› Issue (1): 52-56.doi: 10.19640/j.cnki.jtau.2022.01.011

• 研究与简报 • 上一篇    下一篇

线纹海马副溶血弧菌的分离鉴定及药物筛选

刘文军1, 尚东维1,2, 于小涵2, 崔培2, 杨燕菁2, 孙金辉2,通信作者   

  1. 1.天津嘉禾田源观赏鱼养殖有限公司,天津301809;
    2.天津农学院 水产学院,天津 300392
  • 收稿日期:2020-06-26 出版日期:2022-03-31 发布日期:2022-04-14
  • 通讯作者: 孙金辉(1979—),男,教授,硕士,主要从事水生生物行为生态学方向。E-mail:jhsun1008@163.com。
  • 作者简介:刘文军(1978—),男,工程师,大专,主要从事观赏鱼养殖方向。E-mail:liuwenjun92@163.com。

Isolation, identification and antibiotic susceptibility testing of Vibrio parahaemolyticus from Hippocampus erectus

Liu Wenjun1, Shang Dongwei1,2, Yu Xiaohan2, Cui Pei2, Yang Yanjing2, Sun Jinhui2,Corresponding Author   

  1. 1. Jiahe Tianyuan Ornamental fish breeding Co., Ltd., Tianjin 301809, China;
    2. College of Fisheries, Tianjin Agricultural University, Tianjin 300392, China
  • Received:2020-06-26 Online:2022-03-31 Published:2022-04-14

摘要: 为探究引起天津某养殖场线纹海马发病死亡的病因,从患病线纹海马肝胰脏分离得到一株优势菌Par-1,经细菌形态学观察、生理生化特征检测、16S rRNA 测序及系统进化树分析等方法确定其种。形态学观察及生理生化检测结果表明,Par-1为短小、弯曲呈弧状的革兰氏阴性菌,发酵葡萄糖产酸不产气,赖氨酸脱羧酶、硝酸盐还原等为阳性;菌株所扩增的16S rRNA基因序列长度为1 418 bp,与副溶血弧菌(Vibrio parahaemolyticus)的同源性达99%~100%,从而鉴定该菌株为副溶血弧菌。人工感染试验结果表明,其对线纹海马的半数致死量(LD50)为5.01×106 CFU/mL。药敏试验结果显示,该菌株对亚胺培南、美罗培南、头孢噻肟、阿齐霉素、诺氟沙星、链霉素、四环素等22种药物敏感。本研究为防治天津地区线纹海马细菌性病害提供参考。

关键词: 线纹海马, 副溶血弧菌, 病原鉴定, 药敏试验

Abstract: To explore the pathogens causing the mortality of the lined seahorses(Hippocampus erectus)in some fish farms located in Tianjin, the predominant bacteria Par-1 was isolated from the dying seahorses' liver pancreas. Through multiple methods, including morphological observation, physicochemical characteristics test, and 16S rRNA analysis, the results showed that Par-1 was a gram-negative bacterium with short and curved shape, and it could ferment glucose without gas. 16S rRNA gene of Par-1 amplified by PCR was a 1 418 bp gene fragment, and the analysis on the phylogenetic tree showed that Par-1 was most closely related to Vibrio parahaemolyticus, with sequence homology reached to 99%-100%, so Par-1 was identified as Vibrio parahaemolyticus. The median lethal dose(LD50)was 5.01×106 CFU/mL by challenge. The antibiotic sensitivity analysis showed that the strain was sensitive to 22 kinds of anti-bacteria drugs including imipenem, meropenem, cefotaxime, azithromycin, norfloxacin, streptomycin and tetracycline, etc. The results will provide reference for the control of bacterial disease from the lined seahorses.

Key words: lined seahorse, Vibrio parahaemolyticus, physicochemical characteristics, antibiotic sensitivity

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