We compared the performance and physiological response of diploid and triploid Atlantic salmon () following 21 days of either unpredictable chronic stress (UCS) or no disturbance (control). Thereafter, all four groups were challenged with a novel acute stressor consisting of crowding, netting and transfer into another tank. Growth was monitored during the 21-day period, and stress response to the novel acute stress challenge was assessed by blood chemistry parameters and pituitary gene expression. Plasma parameters were analyzed before (0) and 15, 30, 45, 60, 90, 120, 240, and 300 min after acute stress induction, whereas gene expression was analyzed at 0, 30, 60, 120, and 240 min. The results showed: a) similar growth rate and condition factor reductions from UCS in triploids and diploids, b) higher post-stress plasma Acth and cortisol levels in triploids compared with diploids, c) wider post-stress fluctuations in most of the other plasma parameters for triploids compared with diploids, particularly for glucose and lactate, d) and levels were more upregulated in control diploids than control triploids, and e) only minor changes in pituitary gene expression from UCS in both diploids and triploids, but with a noticeable upregulation of and and in the triploids. Our results suggest that triploid Atlantic salmon have a higher energy cost in response to stress than diploids salmon. This can make them more sensitive to suboptimal conditions and episodes of acute and chronic stress.

中文翻译：

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比较急性和慢性应激二倍体和三倍体大西洋鲑鱼（Salmo salar）的生理反应

我们比较了二倍体和三倍体大西洋鲑鱼 () 在不可预测的慢性应激 (UCS) 或无干扰（对照）21 天后的表现和生理反应。此后，所有四组都接受了一种新的急性应激源的挑战，包括拥挤、网状和转移到另一个水箱中。在 21 天期间监测生长，并通过血液化学参数和垂体基因表达评估对新的急性应激挑战的应激反应。在急性应激诱导前（0）和15、30、45、60、90、120、240和300分钟分析血浆参数，而在0、30、60、120和240分钟分析基因表达。结果显示：a) 三倍体和二倍体中 UCS 的生长速率和条件因子降低相似，b) 与二倍体相比，三倍体中应激后血浆 Acth 和皮质醇水平更高，c) 大多数其他血浆中应激后波动更大与二倍体相比，三倍体的参数，特别是葡萄糖和乳酸，d) 对照二倍体中的参数和水平比对照三倍体更上调，e) 二倍体和三倍体中 UCS 的垂体基因表达仅发生微小变化，但有明显的上调和 在三倍体中。我们的结果表明，三倍体大西洋鲑鱼在应对压力时比二倍体鲑鱼具有更高的能量成本。这可以使他们对次优条件以及急性和慢性压力的发作更加敏感。