Abstract Seaweeds are considered novel feed ingredients, nutraceutical compounds and source of pigments and proteins. They appear to possess bioactive properties, such as hypolipidemic, antioxidant and immune-stimulative actions; furthermore, their proteins are considered just as nutritious as terrestrial vegetables. In the present work, rainbow trout (Oncorhynchus mykiss Walbaum) was fed for 95 days with three diets: a fishmeal-based positive control diet (C+), a vegetable protein-based negative control diet (C−) and a diet similar to C − where 5% of soybean concentrate was replaced by a commercial blend of seaweeds (T). The monitored parameters were fish performance, physical and marketable characteristics, fillet oxidative status and fatty acid content. The estimated indices of enzyme activities involved in lipid metabolism were calculated. Fish performances were reduced in C − and T fish; C − and T fillet fatty acid (FA) profiles globally showed the same pattern and were distinct from C+, i.e. with a lower content of polyunsaturated FAs and a higher content of monounsaturated and polyunsaturated n6 FAs; contrarywise, saturated FAs were significantly lower in T group in comparison to the other two groups (p < .01). The estimated indices of enzyme activity highlighted differences between dietary groups; desaturase activities of C18 and n3 FAs were higher in T in comparison to C− (p < .001). A slight impoverishment of antioxidant activity was found in T compared to C + group. Dietary seaweeds seemed to be capable of influencing fillet FA composition as well as the activity of enzymes related to lipid metabolism. Further studies in this regard are encouraged. Highlights Seaweeds are novel feed ingredients with nutraceutical properties Saturated fatty acids of rainbow trout fillets were lowered by seaweed inclusion in the diet Estimated desaturase activities of C18 and n3 fatty acids were higher in seaweed-fed trout

中文翻译：

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富含植物蛋白的饮食中的商业大型藻类提取物减少了 Oncorhynchus mykiss walbaum 鱼片的饱和脂肪酸

摘要 海藻被认为是新型饲料成分、营养化合物以及色素和蛋白质的来源。它们似乎具有生物活性特性，例如降血脂、抗氧化和免疫刺激作用；此外，它们的蛋白质被认为与陆生蔬菜一样有营养。在目前的工作中，虹鳟鱼 (Oncorhynchus mykiss Walbaum) 用三种饮食喂养 95 天：基于鱼粉的阳性对照饮食 (C+)、基于植物蛋白的阴性对照饮食 (C-) 和类似于 C 的饮食- 其中 5% 的大豆浓缩物被商业海藻 (T) 混合物取代。监测的参数是鱼的性能、物理和适销性特征、鱼片氧化状态和脂肪酸含量。计算了参与脂质代谢的酶活性的估计指数。C - 和 T 鱼的鱼性能降低；C - 和 T 鱼片脂肪酸 (FA) 分布在全球范围内显示出相同的模式并且与 C+ 不同，即多不饱和脂肪酸含量较低，而单不饱和和多不饱和 n6 脂肪酸含量较高；相反，与其他两组相比，T 组的饱和脂肪酸显着降低（p < .01）。酶活性的估计指数突出了饮食组之间的差异；与 C- 相比，C18 和 n3 FA 的去饱和酶活性在 T 中更高（p < .001）。与C + 组相比，T 组的抗氧化活性略有下降。膳食海藻似乎能够影响鱼片 FA 组成以及与脂质代谢相关的酶的活性。鼓励在这方面进一步研究。