Largely attributable to concerns surrounding sustainability, the utilisation of omega-3 long-chain polyunsaturated fatty acid-rich (n-3 LC-PUFA) fish oils in aquafeeds for farmed fish species is an increasingly concerning issue. Therefore, strategies to maximise the deposition efficiency of these key health beneficial fatty acids are being investigated. The present study examined the effects of four vegetable-based dietary lipid sources (linseed, olive, palm and sunflower oil) on the deposition efficiency of n-3 LC-PUFA and the circulating blood plasma concentrations of the appetite-regulating hormones, leptin and ghrelin, during the grow-out and finishing phases in rainbow trout culture. Minimal detrimental effects were noted in fish performance; however, major modifications were apparent in tissue fatty acid compositions, which generally reflected that of the diet. These modifications diminished somewhat following the fish oil finishing phase, but longer-lasting effects remained evident. The fatty acid composition of the alternative oils was demonstrated to have a modulatory effect on the deposition efficiency of n-3 LC-PUFA and on the key endocrine hormones involved in appetite regulation, growth and feed intake during both the grow-out and finishing phases. In particular, n-6 PUFA (sunflower oil diet) appeared to 'spare' the catabolism of n-3 LC-PUFA and, as such, resulted in the highest retention of these fatty acids, ultimately highlighting new nutritional approaches to maximise the maintenance of the qualitative benefits of fish oils when they are used in feeds for aquaculture species.

译文

:很大程度上是由于人们对可持续性的关注,在养殖鱼类的水产饲料中利用富含ω-3长链多不饱和脂肪酸(n-3 LC-PUFA)的鱼油已成为一个日益引起关注的问题。因此,正在研究最大化这些对健康有益的关键脂肪酸的沉积效率的策略。本研究检查了四种基于蔬菜的膳食脂质来源(亚麻籽,橄榄油,棕榈和葵花籽油)对n-3 LC-PUFA的沉积效率以及食欲调节激素,瘦素和脂肪的循环血浆浓度的影响。 ghrelin,在虹鳟鱼养殖的成长期和育肥阶段。在鱼类生产中注意到了最小的有害影响。然而,在组织脂肪酸组成上的主要改变是明显的,这通常反映出饮食的改变。在鱼油精制阶段之后,这些修饰有所减弱,但更持久的效果仍然很明显。事实证明,替代油的脂肪酸组成对n-3 LC-PUFA的沉积效率以及在成长期和肥育阶段参与食欲调节,生长和采食的关键内分泌激素具有调节作用。 。特别是n-6 PUFA(葵花籽油饮食)似乎“浪费”了n-3 LC-PUFA的分解代谢,因此,这些脂肪酸的保留率最高,最终突出了新的营养方法,以最大限度地维持鱼油用于水产养殖种类饲料中时的定性益处。

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