Effects of partial substitution of dietary fish oil with blends of vegetable oils, on blood leucocyte fatty acid compositions, immune function and histology in European sea bass (Dicentrarchus labrax L.)
Effects of partial substitution of dietary fish oil with blends of vegetable oils, on blood leucocyte fatty acid compositions, immune function and histology in European sea bass (Dicentrarchus labrax L.)
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DOI：
10.1017/s000711450773461x
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发表时间：
2007-10-01
影响因子：
3.6
通讯作者：
Bell, J. Gordon
中科院分区：
文献类型：
--
作者：
Mourente, Gabriel;Good, Joanne E.;Bell, J. Gordon
在十年左右的时间里，将没有足够的鱼油来满足水产养殖增长的需要。因此，正在研究替代来源，以减少对野生鱼类作为鱼油来源的依赖。植物油（VO）是一种可行的植物油替代品。然而，重要的是要确定替代膳食脂质不仅以正确的数量和平衡提供最佳生长，而且可以维持免疫功能和预防感染，因为众所周知，鱼类的营养状况会影响它们的免疫功能和抗病能力。在替代日粮鱼油的同时，保持免疫功能的一种方法是使用鱼油的混合物，而不是单一的油。在本试验中，用油菜籽、亚麻籽和棕榈油混合饲料替代60%的鱼油，饲喂欧洲黑鲈幼鱼。在能量含量方面，使用两种油混合物来获得类似于油的脂肪酸组成，并提供类似的SFA， MUFA和PUFA平衡。饲喂64周，监测鱼的生长情况及肝脏和血液白细胞的脂肪酸组成。还评估了膳食混合物对选定的先天免疫反应和组织病理学的影响，以及血浆前列腺素E-2的水平。结果表明，在不影响生长、非特异性免疫功能和组织学的情况下，养殖鲈鱼饲料中存在用鱼油替代鱼油的潜力。
Within a decade or so insufficient fish oil (FO) will be available to meet the requirements for aquaculture growth. Consequently, alternative sources are being investigated to reduce reliance on wild fish as a source of FO. Vegetable oils (VO) are a feasible alternative to FO. However, it is important to establish that alternative dietary lipids are not only supplied in the correct quantities and balance for optimal growth, but can maintain immune function and prevent infection, since it is known that the nutritional state of the fish can influence their immune function and disease resistance. A way of maintaining immune function, while replacing dietary FO, is by using a blend of VO rather than a single oil. In this study, juvenile European sea bass (Dicentrarchus labrax) were fed diets with a 60% substitution of FO with a blend of rapeseed, linseed and palm oils. Two oil blends were used to achieve a fatty acid composition similar to FO, in terms of energy content, and provide a similar balance of SFA, MUFA and PUFA. Fish were fed the diets for 64 weeks, after which time growth and fatty acid compositions of liver and blood leucocytes were monitored. The impact of the dietary blends on selected innate immune responses and histopathology were also assessed, together with levels of plasma prostaglandin E-2. The results suggest that potential exists for replacing FO with a VO blend in farmed sea bass feeds without compromising growth, non-specific immune function or histology.