This study was conducted to evaluate the dietary use of vegetable oil sources in grass carp (Ctenopharyngodon idella). Fish were fed diets having the same lipid level from fish oil (FO), palm oil (PO), rapeseed oil (RO), soybean oil (SO) or linseed oil (LO). The results showed that dietary vegetable oils significantly decreased the feed utilization and a significantly lower growth was observed in SO group, while palm oil showed no effect on the growth performance. Dietary vegetable oils suppressed intestinal digestion by inhibiting the activities of digestive enzymes. Vegetable oils significantly elevated the activities of lipase, hepatic lipase and total lipase in liver, and a phenomenon of intense lipid accumulation emerged in liver of PO and SO groups. Furthermore, linseed oil significantly decreased plasma antioxidant capacity, whereas no significant difference was found between RO and FO groups. Dietary vegetable oils caused a significantly lower EPA and DHA in muscle, and further influenced fillet quality through an increase in cohesiveness, gumminess, chewiness and/or springiness, together with a decrease in hardness. Overall, our results indicated that rapeseed oil may be a suitable alternative oil source for grass carp from a point of growth, feed conversion ratio, antioxidative capacity and hepatic histology.

中文翻译：

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油源对少年草鱼生长性能，抗氧化能力，脂肪酸组成和鱼片品质的影响

进行这项研究以评估草鱼（Ctenopharyngodon idella）。用鱼油（FO），棕榈油（PO），菜籽油（RO），大豆油（SO）或亚麻子油（LO）喂养具有相同脂质水平的饲料。结果表明，日粮植物油显着降低了饲料利用率，SO组的生长显着降低，而棕榈油对生长性能没有影响。膳食植物油通过抑制消化酶的活性来抑制肠道消化。植物油显着提高了肝脏中脂肪酶，肝脂肪酶和总脂肪酶的活性，PO和SO组的肝脏中出现了强烈的脂质蓄积现象。此外，亚麻籽油显着降低血浆抗氧化能力，而RO和FO组之间未发现显着差异。膳食植物油会导致肌肉中的EPA和DHA显着降低，并通过增加内聚力，胶粘性，耐嚼性和/或弹性以及硬度降低而进一步影响鱼片质量。总体而言，我们的结果表明，从生长，饲料转化率，抗氧化能力和肝组织学角度来看，菜籽油可能是草鱼的合适替代油源。