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Host selectively contributes to shaping intestinal microbiota of carnivorous and omnivorous fish.
Journal of General and Applied Microbiology 2018 November 10
Fish production is increasingly important to global food security. A major factor in maintaining health, productivity and welfare of farmed fish is the establishment and promotion of a stable and beneficial intestinal microbiota. Understanding the effects of factors such as host and environment on gut microbial community structure is essential for developing strategies for stimulating the establishment of a health-promoting gut-microbiota. We compared intestinal microbiota of common carp and rainbow trout, two fish with different dietary habits, sourced from various farm locations. There were distinct differences in the gut microbiota of carp and trout intestine. The microbiota of carp was dominated by Fusobacteriia and Gammaproteobacteria, while the trout microbiota consisted predominantly of Mollicutes and Betaproteobacteria. The majority of bacterial sequences clustered into a relatively low number of operational taxonomic units (OTUs) revealing a comparatively simple microbiota, with Cetobacterium, Aeromonas and Mycoplasma being highly abundant. Within each species, fish from different facilities were found to have markedly similar predominant bacterial populations despite distinctly different rearing environments, demonstrating intra-species uniformity and significant influence of host selectivity. This study demonstrates that in fish the host species imparts substantial impact in shaping the community structure of the intestinal microbiota.
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