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首页> 外文期刊>Applied Microbiology >Aquacultured Rainbow Trout (Oncorhynchus mykiss) Possess a Large Core Intestinal Microbiota That Is Resistant to Variation in Diet and Rearing Density
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Aquacultured Rainbow Trout (Oncorhynchus mykiss) Possess a Large Core Intestinal Microbiota That Is Resistant to Variation in Diet and Rearing Density

机译：水产养殖虹鳟鱼（Oncorhynchus mykiss）拥有一个大的核心肠道菌群，可以抵抗饮食和饲养密度的变化

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As global aquaculture fish production continues to expand, an improved understanding of how environmental factors interact in fish health and production is needed. Significant advances have been made toward economical alternatives to costly fishmeal-based diets, such as grain-based formulations, and toward defining the effect of rearing density on fish health and production. Little research, however, has examined the effects of fishmeal- and grain-based diets in combination with alterations in rearing density. Moreover, it is unknown whether interactions between rearing density and diet impact the composition of the fish intestinal microbiota, which might in turn impact fish health and production. We fed aquacultured adult rainbow trout ( Oncorhynchus mykiss ) fishmeal- or grain-based diets, reared them under high- or low-density conditions for 10 months in a single aquaculture facility, and evaluated individual fish growth, production, fin indices, and intestinal microbiota composition using 16S rRNA gene sequencing. We found that the intestinal microbiotas were dominated by a shared core microbiota consisting of 52 bacterial lineages observed across all individuals, diets, and rearing densities. Variations in diet and rearing density resulted in only minor changes in intestinal microbiota composition despite significant effects of these variables on fish growth, performance, fillet quality, and welfare. Significant interactions between diet and rearing density were observed only in evaluations of fin indices and the relative abundance of the bacterial genus Staphylococcus . These results demonstrate that aquacultured rainbow trout can achieve remarkable consistency in intestinal microbiota composition and suggest the possibility of developing novel aquaculture strategies without overtly altering intestinal microbiota composition.
机译：随着全球水产养殖鱼类产量的不断增长，需要进一步了解环境因素在鱼类健康和生产中如何相互作用。在经济上替代昂贵的鱼粉基饲料（例如谷物基配方）方面，以及在确定饲养密度对鱼类健康和生产的影响方面，已经取得了重大进展。然而，很少有研究检查鱼粉和谷类饮食与饲养密度的变化相结合的影响。此外，未知的是饲养密度与日粮之间的相互作用是否会影响鱼类肠道菌群的组成，进而可能影响鱼类的健康和生产。我们喂养了以水产养殖成年虹鳟鱼（Oncorhynchus mykiss）为基础的鱼粉或谷类饲料，在高密度或低密度条件下在单个养殖设施中饲养了10个月，并评估了单个鱼的生长，产量，鳍指数和肠道菌群组成采用16S rRNA基因测序。我们发现，肠道菌群主要由共有的核心菌群组成，该菌群由在所有个体，饮食和饲养密度上观察到的52个细菌谱系组成。饮食和饲养密度的变化仅导致肠道菌群组成的微小变化，尽管这些变量对鱼类生长，性能，鱼片质量和福利有显着影响。饮食和饲养密度之间的显着相互作用仅在评估鳍指数和细菌属金黄色葡萄球菌的相对丰度时才见。这些结果表明，水产养殖虹鳟可以在肠道菌群组成上实现显着的一致性，并提出了开发新的水产养殖策略而不显着改变肠道菌群组成的可能性。

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