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首页> 外文期刊>Comparative biochemistry and physiology, Part A. Molecular and integrative physiology >Is winter worse for stressed fish? The consequences of exogenous cortisol manipulation on over-winter survival and condition of juvenile largemouth bass
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Is winter worse for stressed fish? The consequences of exogenous cortisol manipulation on over-winter survival and condition of juvenile largemouth bass

机译：紧张的鱼类过冬了吗？外源皮质醇操纵对越冬存活率和幼年大嘴鲈鱼状况的影响

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Over-winter mortality is an important selective force for warm-water fish (e.g., centrarchids) that live in temperate habitats. Inherent challenges faced by fish during winter may be compounded by additional stressors that activate the hypothalamic-pituitary-interrenal axis, either before or during winter, leading to negative sub-lethal impacts on fish health and condition, and possibly reducing chance of survival. We used experimental cortisol manipulation to test the hypothesis that juvenile largemouth bass (Micropterus salmoides) exposed to semichronic elevation in cortisol prior to winter would experience higher levels of over-winter mortality, physiological alterations and impaired immune status relative to control and sham-treated bass. Over-winter survival in experimental ponds was high, averaging 83%, and did not differ among treatment groups. Over the study period, bass exhibited an average increase in mass of 19.4%, as well as a slight increase in Fulton's condition factor, but neither measure differed among groups. Hepatosomatic index in cortisol-treated bass was 23% lower than in control fish, suggesting lower energy status, but white muscle lipid content was similar across all groups. Lastly, there was no difference in spleen somatic index or parasite load among treatment groups, indicating no long-term immune impairment related to our cortisol manipulation. The current study adds to a growing body of literature on glucocorticoid manipulations where field-based findings are not consistent with laboratory-based conceptual understanding of multiple stressors. This suggests that field conditions may provide fish with opportunities to mitigate negative effects of some stressors. (C) 2015 Elsevier Inc. All rights reserved.
机译：越冬死亡率是生活在温带栖息地的温水鱼（如中心鱼类）的重要选择力。在冬季之前或期间，鱼类在冬季面临的内在挑战可能与激活下丘脑-垂体-肾间轴的其他应激因素加重了关系，导致对鱼类健康和状况的负致死影响，并可能降低生存机会。我们使用实验性的皮质醇操作来测试以下假设：相对于对照和深水处理的鲈鱼，在冬季之前暴露于皮质醇半同步升高的幼年大嘴鲈（Micropterus salmoides）会经历更高水平的越冬死亡率，生理变化和免疫状况受损。 。实验池塘的越冬存活率很高，平均为83％，各处理组之间没有差异。在研究期间，低音表现出平均19.4％的质量增加，并且富尔顿的条件因子略有增加，但两组之间的测量均无差异。皮质醇处理的鲈鱼的肝体指数比对照鱼低23％，表明能量状态较低，但所有组的白肌脂质含量均相似。最后，治疗组之间的脾体指数或寄生虫负荷没有差异，表明与我们的皮质醇操作无关的长期免疫损伤。当前的研究增加了关于糖皮质激素操纵的文献，其中基于现场的发现与基于实验室对多种应激源的概念理解不一致。这表明田间条件可能为鱼类提供减轻某些压力源负面影响的机会。 （C）2015 Elsevier Inc.保留所有权利。

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