Towards Sustainable Aquafeeds: Complete Substitution of Fish Oil with Marine Microalga Schizochytrium sp. Improves Growth and Fatty Acid Deposition in Juvenile Nile Tilapia (Oreochromis niloticus).
Towards Sustainable Aquafeeds: Complete Substitution of Fish Oil with Marine Microalga Schizochytrium sp. Improves Growth and Fatty Acid Deposition in Juvenile Nile Tilapia (Oreochromis niloticus).
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DOI：
10.1371/journal.pone.0156684
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Coley ML
中科院分区：
文献类型：
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作者：
Sarker PK;Kapuscinski AR;Lanois AJ;Livesey ED;Bernhard KP;Coley ML
我们对富含DHA的海洋微藻裂殖酵母的干燥全细胞进行了84天的营养饲养试验。(Sc)确定尼罗罗非鱼最大生长的最佳鱼油替代水平(部分或全部)。当我们用裂殖酵母完全替代鱼油时(SC100饲料)，我们发现与含有鱼油的对照饲料(Sc0)相比，体重增加和蛋白质效率比(PER)显著增加，饲料转化率(FCR)和采食量降低(改善)；而SGR和成活率在所有饲料中没有显著变化。SC100饲料中22：6n3的DHA含量最高，导致鱼片中DHA含量最高，从而导致罗非鱼鱼片中DHA/EPA比值最高。裂殖酵母属(Schizochytrium sp.)在罗非鱼幼鱼饲料中完全替代鱼油的优质候选者，为罗非鱼幼鱼饲料的配方和优化成分提供了一种创新的手段，同时提高了罗非鱼水产养殖的饲料效率，并进一步开发了环境和社会可持续的水产饲料。结果表明，用富含DHA的海洋SC替代鱼油可提高罗非鱼鱼片中n3-LC-PUFA的沉积水平。这些结果支持进一步的研究，以降低裂殖酵母的生产成本，并将不同的海洋微藻结合起来，以取代鱼油和鱼粉制成水产饲料。
We conducted a 84-day nutritional feeding experiment with dried whole cells of DHA-rich marine microalga Schizochytrium sp. (Sc) to determine the optimum level of fish-oil substitution (partial or complete) for maximum growth of Nile tilapia. When we fully replaced fish oil with Schizochytrium (Sc100 diet), we found significantly higher weight gain and protein efficiency ratio (PER), and lower (improved) feed conversion ratio (FCR) and feed intake compared to a control diet containing fish oil (Sc0); and no significant change in SGR and survival rate among all diets. The Sc100 diet had the highest contents of 22:6n3 DHA, led to the highest DHA content in fillets, and consequently led to the highest DHA:EPA ratios in tilapia fillets. Schizochytrium sp. is a high quality candidate for complete substitution of fish oil in juvenile Nile tilapia feeds, providing an innovative means to formulate and optimize the composition of tilapia juvenile feed while simultaneously raising feed efficiency of tilapia aquaculture and to further develop environmentally and socially sustainable aquafeeds. Results show that replacing fish oil with DHA-rich marine Sc improves the deposition of n3 LC PUFA levels in tilapia fillet. These results support further studies to lower Schizochytrium production costs and to combine different marine microalgae to replace fish oil and fishmeal into aquafeeds.