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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Effect of varying dietary levels of ω6 polyunsaturated fatty acids during the early ontogeny of the sea scallop, Placopecten magellanicus
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Effect of varying dietary levels of ω6 polyunsaturated fatty acids during the early ontogeny of the sea scallop, Placopecten magellanicus

机译：扇贝麦哲伦早期个体发育过程中饮食中ω6多不饱和脂肪酸水平变化的影响

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This study investigated the effects of selected microalgal diets on growth, survival and fatty acid composition of sea scallops, Placopecten magellanicus, from egg hatching to postlarvae. Scallops were offered Pavlova lutheri (MONO) and Pavlova sp. (strain CCMP 459, P459) in combination with Chaetoceros muelleri (CHGRA) and P459 alone. These diets exhibited varying proportions of ω6 docosapentaenoic acid (22:5ω6, DPA) which represented 8.9% of total fatty acids in P459 compared to 5.4% in P459-CHGRA and only 0.5% in MONO-CHGRA. For experiment Ⅰ, larvae were fed three diets (MONO-CHGRA, P459-CHGRA or P459 alone) for 35 days after fertilization. For experiment Ⅱ, larvae were fed P459-CHGRA for 21 days and split among the three diets until 39 days post-fertilization. For experiment Ⅲ, 4-day-old larvae were exposed to P459-CHGRA until they become postlarvae. MONO-CHGRA failed to produce pediveligers when fed to early veligers but yielded competent larvae when fed to late veligers. This may be related to the low ω6 DPA content of this diet. High accumulation of DPA by early veligers suggests a nutritional requirement for this fatty acid. Unialgal P459 supported lower pediveliger production and lower growth rate than other diets containing CHGRA. This may be the effect of higher levels of energetic substrates in CHGRA-containing diets. Finally, P459-CHGRA yielded the best survival and growth rate during the whole larval period. All three experiments showed marked arachidonic acid (20:4ω6, AA) accumulation in early veligers (4 to 21 days) and in pediveligers (32 to 43 days). Accumulation of AA during metamorphosis might reflect stimulation of immune functions due to pathogen infection and degradation of larval organs or the role of AA in cell signalling processes associated with tissue reorganization. Early veligers markedly accumulate DPA likely in response to low docosahexaenoic acid (22:6ω3, DHA) concentrations in the three tested diets. The potential role and effect of DPA as a substitute for DHA is discussed.
机译：这项研究调查了选定的微藻饮食对从卵孵化到幼虫的扇贝（Placopecten magellanicus）扇贝的生长，存活和脂肪酸组成的影响。扇贝提供帕夫洛娃（Pavlova lutheri）（MONO）和帕夫洛娃（Pavlova s​​p。）。 （菌株CCMP 459，P459）与单独的Chaetoceros muelleri（CHGRA）和P459结合使用。这些饮食表现出不同比例的ω6二十碳五烯酸（22：5ω6，DPA），占P459中总脂肪酸的8.9％，而P459-CHGRA中为5.4％，MONO-CHGRA中仅为0.5％。对于实验Ⅰ，在受精后的35天内给幼虫喂食三种日粮（单独的MONO-CHGRA，P459-CHGRA或P459）。对于实验Ⅱ，给幼虫喂食P459-CHGRA 21天，并在这三种食物之间分配直到受精后39天。对于实验Ⅲ，将4天大的幼虫暴露于P459-CHGRA中，直到成为幼虫。 MONO-CHGRA喂早熟者时不能产生虫，而喂喂晚熟者时能产生幼虫。这可能与该饮食中低ω6DPA含量有关。早期食用者对DPA的高积累表明该脂肪酸需要营养。与其他含CHGRA的饮食相比，Unialgal P459支持较低的ped剂生产和较低的生长速度。这可能是含CHGRA的饮食中高能底物水平的影响。最终，P459-CHGRA在整个幼虫期产生了最佳的存活和生长速率。所有这三个实验都显示了花生四烯酸（20：4ω6，AA）在早期（4至21天）和花（32至43天）中的积累。变态过程中AA的积累可能反映了由于病原体感染和幼体器官降解或AA在与组织重组相关的细胞信号传导过程中的作用而刺激了免疫功能。早熟者在三种测试饮食中可能会响应低二十二碳六烯酸（22：6ω3，DHA）浓度而明显积累DPA。讨论了DPA替代DHA的潜在作用和效果。

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