We evaluated the growth performance and fatty acid composition of juvenile Florida Pompano Trachinotus carolinus that were fed diets containing different combinations of n‐3 and n‐6 polyunsaturated fatty acids (PUFAs) to assess the relative importance of C₁₈ PUFAs and long‐chain (LC) PUFAs in meeting the essential fatty acid requirements of this species. Juvenile fish (mean ± SD =47.4 ± 0.6 g/fish) were fed diets containing different combinations of n‐3 and n‐6 PUFAs: a positive control containing menhaden fish oil, a negative control containing hydrogenated soybean oil, and experimental diets containing hydrogenated soybean oil amended with ethyl esters of 18:3(n‐3); 18:3(n‐3) and 18:2(n‐6); 22:6(n‐3); 22:6(n‐3) and 20:4(n‐6); or 20:5(n‐3), 22:6(n‐3), and 20:4(n‐6). After 7 weeks, weight gain, feed conversion ratio, and specific growth rate were significantly greater among fish that were fed the positive control feed in comparison with those that received the negative control feed. The addition of n‐3 and/or n‐6 PUFAs to the negative control formulation did not significantly improve performance in any case, although numeric improvements observed for weight gain and feed conversion ratio appeared to suggest some advantage from providing a complement of both n‐3 and n‐6 LC‐PUFAs in the diet. Fatty acid composition varied significantly between all tissues, generally reflecting dietary fatty acid profiles. Tissue fatty acid profiles suggest that Florida Pompano have some ability to elongate and desaturate fatty acids and may be able to survive on diets containing C₁₈ PUFAs, but they perform optimally when provided with LC‐PUFAs directly.

中文翻译：

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在佛罗里达Po参评估多元不饱和脂肪酸的必要性

我们评估了喂食含有n-3和n-6多不饱和脂肪酸（PUFA）不同组合的日粮的佛罗里达Florida鱼Trachinotus carolinus的生长性能和脂肪酸组成，以评估C ₁₈的相对重要性PUFA和长链（LC）PUFA满足该物种的必需脂肪酸要求。向幼鱼（平均±SD = 47.4±0.6 g /鱼）饲喂含有n-3和n-6 PUFA不同组合的饲料：阳性对照中含有鲱鱼油，阴性对照中包含氢化大豆油，实验饲料中含有用18：3（n-3）的乙酯改性的氢化大豆油; 18：3（n-3）和18：2（n-6）; 22：6（n-3）; 22：6（n-3）和20：4（n-6）; 或20：5（n-3），22：6（n-3）和20：4（n-6）。7周后，饲喂阳性对照饲料的鱼的体重增加，饲料转化率和比生长速率显着高于接受阴性对照饲料的鱼。在阴性对照配方中添加n-3和/或n-6 PUFA在任何情况下都不会显着改善生产性能，尽管观察到的增重和饲料转化率的数值改善似乎表明，通过提供n饮食中的3和n-6 LC-PUFA。所有组织之间的脂肪酸组成均存在显着差异，通常反映出饮食中的脂肪酸状况。组织中的脂肪酸谱表明，佛罗里达Po参具有一定的伸长和去饱和脂肪酸的能力，并且可能在含C的饮食中存活 通常反映饮食中的脂肪酸状况。组织中的脂肪酸谱表明，佛罗里达Po参具有一定的伸长和去饱和脂肪酸的能力，并且可能在含C的饮食中存活 通常反映饮食中的脂肪酸状况。组织中的脂肪酸谱表明，佛罗里达Po参具有一定的伸长和去饱和脂肪酸的能力，并且可能在含C的饮食中存活_18个PUFA，但是当直接与LC-PUFA一起提供时，它们的性能最佳。