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首页> 外文期刊>ICES Journal of Marine Science >Diet-induced differences in the essential fatty acid (EFA) compositions of larval Atlantic cod (Gadus morhua L.) with reference to possible effects of dietary EFAs on larval performance
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Diet-induced differences in the essential fatty acid (EFA) compositions of larval Atlantic cod (Gadus morhua L.) with reference to possible effects of dietary EFAs on larval performance

机译：饮食引起的大西洋鳕鱼幼鱼必需脂肪酸（EFA）组成的差异，参考膳食EFA对幼虫性能的可能影响

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摘要

We studied the performance of cod rearing in which live feed was given under three different essential fatty acid (EFA) enrichment regimes, using commercially available live-feed enrichments. We assessed the fatty acid profile [docosahexaenoic (DHA), eicosapentaenoic (EPA), and arachidonic acid (AA)] in larval somatic tissue, relative to its amounts in both rotifers and Artemia as well as to larval performance. Overall, percentage lipid level of each experimental diet for the trial was approximately 50%. Further, there were no significant differences in total fatty acid levels of larvae from each treatment at the end of the trial (mean = 444.76 μg fatty acid per mg lipid). However, during the rotifer phase, larvae from each treatment were able to incorporate comparable levels of %DHA, irrespective of levels in the diet. Despite this, the rotifer diet with more %DHA still promoted better larval growth than other treatments. Conversely, larvae from two of the treatments did not exhibit any accumulation of AA, reflecting levels found in the diet instead. However, between-tank differences in larval %AA showed improved growth during the rotifer period when larval %AA was high. Low ratios of EPA had no effect. During the Artemia phase, percentage levels of larval DHA decreased; there was no accumulation of DHA relative to dietary levels, which in Artemia were significantly lower than in rotifers (6 cf. 20—30%). However, DHA levels in larvae at the end of the experiment correlated positively with survival. Artemia contained lower levels of AA than rotifers (1.5 cf. 3.0%), yet comparable levels of AA were found in rotifer-fed and Artemia-fed larvae. This also differed significantly between treatments, and correlated positively with survival.
机译：我们使用市场上可买到的活饲料浓缩技术，研究了在三种不同的必需脂肪酸（EFA）浓缩方案下进行活饲料投喂的鳕鱼的饲养性能。我们评估了幼虫体细胞组织中的脂肪酸谱[二十二碳六烯酸（DHA），二十碳五烯酸（EPA）和花生四烯酸（AA）]，相对于轮虫和卤虫中的含量以及幼虫的表现。总体而言，该试验的每种实验饮食的脂质水平百分比约为50％。此外，在试验结束时，各处理幼虫的总脂肪酸水平无显着差异（平均= 444.76μg脂肪酸/ mg脂质）。但是，在轮虫阶段，每种饮食的幼虫都能掺入相当水平的％DHA，而与饮食中的水平无关。尽管如此，具有更多％DHA的轮虫饮食仍比其他处理方法促进幼虫生长更好。相反，两种处理的幼虫没有显示出任何AA的积累，而是反映了饮食中的水平。但是，幼虫％AA较高时，幼虫％AA的罐间差异显示了其轮虫期的生长改善。低比例的EPA无效。在卤虫阶段，幼虫DHA的百分比水平下降； DHA没有相对于饮食水平的积累，卤虫中的DHA显着低于轮虫（6 cf. 20-30％）。但是，实验结束时幼虫中的DHA水平与存活率呈正相关。卤虫中的AA含量比轮虫低（1.5 cf. 3.0％），但在轮虫喂养和卤虫喂养的幼虫中发现的AA含量相当。这在治疗之间也有显着差异，并且与生存率呈正相关。

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