In Tasmania (Australia), during the marine phase, it has been observed that flesh pigmentation significantly drops in summer, possibly due to high water temperatures (> 20 °C). Although this deleterious effect of summer temperatures has been ascertained, there is a lack of knowledge of the actual mechanisms behind the impaired uptake and/or loss of pigments in Atlantic salmon in a challenging environment. Since the microbial community in the fish intestine significantly changes in relation to the variations of water temperature, this study was conducted to assess how the gut microbiota profile also correlates with the flesh color during temperature fluctuation. We sampled 68 fish at three time points covering the end of summer to winter at a marine farm in Tasmania, Australia. Flesh color was examined in two ways: the average color throughout and the evenness of the color between different areas of the fillet. Using 16S rRNA sequencing of the v3–v4 region, we determined that water temperature corresponded to changes in the gut microbiome both with alpha diversity (Kruskal-Wallis tests P = 0.05) and beta diversity indices (PERMANOVA P = 0.001). Also, there was a significant correlation between the microbiota and the color of the fillet (PERMANOVA P = 0.016). There was a high abundance of Pseudoalteromonadaceae, Enterobacteriaceae, Microbacteriaceae, and Vibrionaceae in the pale individuals. Conversely, carotenoid-synthesizing bacteria families (Bacillaceae, Mycoplasmataceae, Pseudomonas, Phyllobacteriaceae, and Comamonadaceae) were found in higher abundance in individuals with darker flesh color.

在塔斯马尼亚州（澳大利亚），在海相时期，据观察，夏季的肉色沉淀显着下降，这可能是由于水温高（> 20°C）所致。尽管已经确定了夏季温度的这种有害影响，但是，在具有挑战性的环境中，缺乏对大西洋鲑鱼色素摄取和/或色素损失的背后实际机制的了解，这一点仍然缺乏。由于鱼肠中的微生物群落随水温的变化而发生显着变化，因此进行了这项研究，以评估温度波动期间肠道微生物群的分布也与肉色相关。在澳大利亚塔斯马尼亚州的一个海洋农场中，我们在三个时间点（从夏末到冬）的三个时间点采样了68条鱼。通过两种方式检查肤色：整个平均颜色以及鱼片不同区域之间的颜色均匀度。使用v3–v4区域的16S rRNA测序，我们确定水温与肠道微生物组的变化都具有alpha多样性（Kruskal-Wallis测试）P  = 0.05）和贝塔多样性指数（PERMANOVA P  = 0.001）。此外，微生物区系和鱼片的颜色之间也存在显着相关性（PERMANOVA P  = 0.016）。在苍白的个体中有大量假单胞菌科，肠杆菌科，微杆菌科和弧菌科。相反，类胡萝卜素合成细菌的家庭（芽孢杆菌，Mycoplasmataceae，假单胞菌，Phyllobacteriaceae和Comamonadaceae）的丰度与较深肤色的个体更高的发现。