期刊
VETERINARY MICROBIOLOGY
卷 173, 期 1-2, 页码 84-91出版社
ELSEVIER
DOI: 10.1016/j.vetmic.2014.07.022
关键词
Bdellovibrio-and-like organisms; Bacteriovorax; Shrimp larviculture; Vibriosis; Biocontrol
资金
- Special Project of Science and Technology Promotion for Marine Fisheries of Guangdong Province [A201008B03, A201208B05]
- Natural Science Foundation of Guangdong Province [S2012040007698]
The potential application of Bdellovibrio-and-like organisms (BALOs) for the biocontrol of bacterial diseases has been widely recognized. However, no marine BALOs have been reported for Vibrio-related infections in penaeid shrimp. In the present study, the bacteriolytic ability of the marine Bacteriovorax strain DA5 against Vibrio alginolyticus zouA was examined by cocultivation and electron microscopy, and optimal lysis was observed at 30-35 degrees C and 20-30 parts per thousand salinity along with a high multiplicity of infection. Then, we showed that experimentally infected Litopenaeus vannamei larvae exhibited significantly higher survival with incremental DA5 levels. Finally, variation in the bacterial counts and the bacterial community in larval rearing water was investigated after prophylactic application of DA5. The elimination effect of DA5 on vibrios was visible at early time points, whereas only a few non-dominant bacteria, rather than the predominant populations, were affected through analysis of denaturing gradient gel electrophoresis of the 16S rDNA V3 region. Accordingly, the prophylactic and therapeutic efficacies of DA5 on vibriosis associated with L vannamei could markedly enhance larval survivability, and these results will facilitate the application of marine Bacteriovorax to control vibriosis in shrimp larviculture. (C) 2014 Elsevier B.V. All rights reserved.
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