Journal
AQUACULTURE
Volume 496, Issue -, Pages 285-290Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquaculture.2018.04.065
Keywords
Vibrio ponticus; Virulence test; Histology; Pathology; Trachinotus ovatus
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Funding
- National Natural Science Foundation of China [31560725, 41666006]
- Natural Science Foundation of Hainan Province [2016CXTD005]
- Special Program for Marine Science and Technology of Hainan [2015XH02]
- Hainan University campus team project 2017 [hdkytg201704]
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To determine the pathogeny for the mass death in the golden pompano Trachinotus ovatus in Hainan, China, the potential pathogens (HAINUV01, HAINUV02, and HAINUV03) were isolated from the infected pompano. The infected fish showed swollen, hyperemic livers and spleens, yellowish effusion in the gut, and different degrees of ulcerations on the bases of dorsal and pelvic fins. HAINUV01 had the strongest virulence to the pompano with a lethal dose (LD50) of 14 days of 1.75 x 10(2) CFU/g fish by intraperitoneal (i.p.) injection. HAINUV01 was Gram-negative, straight rods, 2.37 +/- 0.12 mu m in length by 0.857 +/- 0.003 mu m width, with only one polar flagellum (4.78 +/- 0.33 mu m). Neighbor-joining phylogenetic analysis based on 16S rRNA, mreB, pyrH, recA and rpoA genes identified HAINUV01 as Vibrio ponticus. These findings provide direction for controlling V. ponticus-related disease occurrences in the future.
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