Abstract
A thorough understanding of the normal bacterial flora associated with shrimp larviculture systems contributes to probiotic screening and disease control. The bacterial community of the water column over a commercial Litopenaeus vannamei larval rearing run was characterized with both culture-dependent and culture-independent methods. A total of 27 phylotypes at the species level were isolated and identified based on 16S rDNA sequence analysis. Denaturing gradient gel electrophoresis (DGGE) analysis of the V3–V5 region of 16S rRNA genes showed a dynamic bacterial community with major changes occurred from stages zoea to mysis during the rearing run. The sequences retrieved were affiliated to four phyla, Proteobacteria, Actinobacteria, Bacteroidetes, and Firmicutes, with the family Rhodobacteraceae being the most frequently recovered one. Subsequently, 13 representative strains conferred higher larval survival than the control when evaluated in the in-vivo experiments; in particular, three candidates, assigned to Phaeobacter sp., Arthrobacter sp., and Microbacterium sp., significantly improved larval survival (P < 0.05). Therefore, the healthy shrimp larviculture system harbored a diverse and favorable bacterial flora, which contribute to larval development and are of great importance in exploiting novel probiotics.
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Supported by the National Natural Science Foundation of China (No. 31372536), the Special Projects of Science and Technology Promotion for Marine Fisheries in Guangdong Province (No. A201008B03), and the Startup Programs for Introduction Personnel of Guangdong Ocean University (Nos. E10046, E11328)
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Xue, M., Liang, H., He, Y. et al. Characterization and in-vivo evaluation of potential probiotics of the bacterial flora within the water column of a healthy shrimp larviculture system. Chin. J. Ocean. Limnol. 34, 484–491 (2016). https://doi.org/10.1007/s00343-016-5024-2
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DOI: https://doi.org/10.1007/s00343-016-5024-2