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首页> 外文期刊>Marine biology >Will global warming affect the functional need for essential fatty acids in juvenile sea bass (Dicentrarchus labrax)? A first overview of the consequences of lower availability of nutritional fatty acids on growth performance
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Will global warming affect the functional need for essential fatty acids in juvenile sea bass (Dicentrarchus labrax)? A first overview of the consequences of lower availability of nutritional fatty acids on growth performance

机译：全球变暖会影响少年鲈鱼（Dicentrarchus labrax）对必需脂肪酸的功能需求吗？营养脂肪酸供应减少对生长性能的影响的初步概述

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摘要

Global climate changes have led to a depletion in omega-3 polyunsaturated fatty acids (n-3 PUFA) in marine phytoplankton that-with food web transfers-could negatively impact fish performance. The aim of this study was to assess the effect of a reduction in the dietary availability of n-3 PUFA on growth performance, organ allometry, and fatty acid composition in juvenile European sea bass (Dicentrarchus labrax) raised at two different temperatures: 15 A degrees C (natural conditions) and 20 A degrees C (global warming scenario). Fish were fed for 5 months with two isoenergetic and isoproteic diets: a reference diet (RD; 1.65% n-3 PUFA on a dry matter basis, DM) used as a proxy of trophic networks where n-3 PUFA were plentiful, and a lower n-3 PUFA diet (LD; 0.73% n-3 PUFA on DM) designed to mimic the expected decrease in n-3 PUFA sources resulting from global climate changes. Results showed decreasing growth rates and slight changes in the muscle polar lipid profile in LD-fed sea bass juveniles, whereas neutral lipids were more affected over the long term. The relative masses of the heart and gastrointestinal system were higher at 20 A degrees C, while liver mass was higher at 15 A degrees C in LD-fed juveniles. However, the mesenteric fat of RD-fed juveniles was higher at 15 A degrees C. Altogether the results suggest that sea bass juveniles are able to implement physiological mechanisms to cope with a decrease in dietary n-3 PUFA and are able to improve growth at the higher temperature, even with a decreased availability of n-3 PUFA. The temperature-driven increase in growth is also observed under the restricted n-3 PUFA diet, and this is accompanied by significant effects on organ allometry and FA profiles. This may indicate the presence of some metabolic costs that remain to be evaluated, but which illustrate that the combination of warming temperatures and n-3 PUFA depletion has significant effects on life history traits.
机译：全球气候变化导致海洋浮游植物中的omega-3多不饱和脂肪酸（n-3 PUFA）减少，这与食物网的转移可能会对鱼类的生长产生负面影响。这项研究的目的是评估在以下两种不同温度下饲养的欧洲鲈鱼（Dicentrarchus labrax）中，n-3 PUFA的日粮有效性降低对其生长性能，器官变态和脂肪酸组成的影响摄氏度（自然条件）和20摄氏度（全球变暖情景）。用两种等能量和等蛋白饮食喂鱼5个月：参考饮食（RD；以干物质为基础的1.65％n-3 PUFA，DM）作为营养网络的代理，其中n-3 PUFA丰富，较低的n-3 PUFA饮食（LD； DM上的0.73％n-3 PUFA）旨在模拟由于全球气候变化导致n-3 PUFA来源的预期减少。结果表明，LD喂养的鲈鱼幼鱼的生长速率下降且肌肉极性脂质分布略有变化，而长期来看，中性脂质受到的影响更大。在LD喂养的少年中，心脏和胃肠系统的相对质量在20 A时较高，而肝脏质量在15 A时较高。但是，RD喂养的幼鱼的肠系膜脂肪在15 A摄氏度时较高。总的结果表明，鲈鱼幼鱼能够实现生理机制以应对饮食中n-3 PUFA的减少，并能够在30℃时改善生长。即使n-3 PUFA的可用性降低，温度也更高。在受限制的n-3 PUFA饮食下，还观察到了温度驱动的生长增加，并伴随着对器官异体形成和FA分布的显着影响。这可能表明存在一些尚待评估的代谢成本，但是这表明温度升高和n-3 PUFA耗竭的结合对生活史特征具有重大影响。

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  • 来源
    《Marine biology》 |2018年第9期|143.1-143.15|共15页
  • 作者

    Gourtay Clemence; Chabot Denis; Audet Celine; Le Delliou Herve; Quazuguel Patrick; Claireaux Guy; Zambonino-Infante Jose-Luis;

  • 作者单位

    Univ Quebec Rimouski, Inst Sci Mer Rimouski, 310 Ursulines, Rimouski, PQ G5L 3A1, Canada;

    Fisheries & Oceans Canada, Inst Maurice Lamontagne, CP 1000, Mont Joli, PQ G5H 3Z4, Canada;

    Univ Quebec Rimouski, Inst Sci Mer Rimouski, 310 Ursulines, Rimouski, PQ G5L 3A1, Canada;

    Ctr Ifremer Bretagne, Inst Francais Rech Exploitat Mer, LEMAR, UMR6539, F-29280 Plouzane, France;

    Ctr Ifremer Bretagne, Inst Francais Rech Exploitat Mer, LEMAR, UMR6539, F-29280 Plouzane, France;

    Univ Bretagne Occidentale, Ctr Ifremer Bretagne, LEMAR, UMR6539, F-29280 Plouzane, France;

    Ctr Ifremer Bretagne, Inst Francais Rech Exploitat Mer, LEMAR, UMR6539, F-29280 Plouzane, France;

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