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首页> 外文期刊>Aquaculture >Supplementation of EPA and DHA emulsions to a Dunaliella tertiolecta diet: effect on growth and lipid composition of scallop larvae, Argopecten purpuratus (Lamarck, 1819)
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Supplementation of EPA and DHA emulsions to a Dunaliella tertiolecta diet: effect on growth and lipid composition of scallop larvae, Argopecten purpuratus (Lamarck, 1819)

机译：在杜氏杜氏藻饮食中补充EPA和DHA乳剂：对扇贝幼虫Argopecten purpuratus的生长和脂质组成的影响（Lamarck，1819年）

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Hatchery-reared Argopecten purpuratus larvae were fed a Dunaliella tertiolecta-diet (DUN-diet) supplemented with 0%, 20% or 40% of a highly unsaturated fatty acid (HUFA) lipid emulsion (ICES Reference Emulsions), rich in docosahexaenoic acid (22:6n - 3, DHA) and eicosapentaenoic acid (20:5n - 3, EPA). A standard diet (ST-diet), consisting of a mixture of Isochrysis galbana (T-iso) and Chaetoceros neogracile was used as a positive control. The supplementation of 20% and 40% HUFA-emulsion to the DUN-diet led to a significantly better daily growth rate (136-177% as compared to DUN-diet) and a higher percentage of eyed-pediveliger larvae in comparison with the non-supplemented DUN-diet. Practically no eyed-larvae were present when fed with D. tertiolecta only, whereas 17% of the larvae developed an eyespot when fed a 20% HUFA-supplement. An increase of the lipid supplement from 20% to 40% further improved the larval performance, although the difference was not significant and less than compared with the changes between the non-supplemented DUN-diet and the DUN + 20%-diet. The poor performance of larvae that received D. tertiolecta only was attributed to the depletion of the lipid reserves in the triglyceride fraction and possibly to the very low levels of saturated fatty acids 14:0 and 16:0, rather than to the low levels of EPA and DHA (in absolute terms). Limited biosynthesis of DHA from EPA as a precursor molecule is proposed. Despite similar relative and absolute fatty acid levels of DHA and EPA in larvae that received the ST-diet and the DUN + 40%HUFA-diet, the former performed significantly better. Other factors such as the arachidonic acid (20:4n - 6) content and the n - 3 - 6 ratio are suggested to play a determining role.
机译：孵化场饲养的紫花苜蓿幼虫被喂食杜氏盐藻（Dunaliella tertiolecta-diet）（DUN-diet），并补充有0％，20％或40％的富含二十二碳六烯酸的高度不饱和脂肪酸（HUFA）脂质乳液（ICES参考乳液）（ 22：6n-3，DHA）和二十碳五烯酸（20：5n-3，EPA）。将标准食物（ST-饮食）（由等鞭金藻（T-iso）和新嗜油小球藻的混合物组成）用作阳性对照。与非DUN饮食补充20％和40％HUFA乳剂相比，DUN饮食可显着提高日生长速度（与DUN饮食相比为136-177％），且双眼幼虫的百分比更高。 -补充了DUN饮食。仅饲喂叔丁酸果蝇时，几乎没有眼幼虫，而饲喂20％的HUFA补充剂时，有17％的幼虫出现了眼点。脂质补充剂从20％增加到40％可以进一步改善幼虫的性能，尽管差异不显着，并且小于未补充DUN饮食和DUN + 20％饮食之间的变化。幼虫表现不佳的原因是仅接受了D. tertiolecta，这归因于甘油三酸酯级分中脂质储备的耗尽，也可能归因于饱和脂肪酸14：0和16：0的含量非常低，而不是由于低水平的饱和脂肪酸。 EPA和DHA（绝对值）。提出了由EPA有限地生物合成DHA作为前体分子。尽管接受ST饮食和DUN + 40％HUFA饮食的幼虫中DHA和EPA的相对和绝对脂肪酸水平相似，但前者的表现要好得多。建议其他因素，例如花生四烯酸（20：4n-6）的含量和n-3 / n-6的比例起决定性作用。

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