This study evaluated the effect of graded dietary levels of astaxanthin krill oil (AKO) and high protein krill meal (HPK) on the growth performance and stress resistance of postlarval (PL) Litopenaeus vannamei. Shrimp of 3.6–2.5 mg body weight (BW) were stocked in outdoor and indoor tanks at 2,371–2,504 PLs m⁻³, respectively. Diets contained 10.0, 30.0 and 50.0 g/kg AKO (outdoor) and 30.0, 50.0 and 70.0 g/kg AKO with 80.0 g/kg HPK (indoor). After 52 and 41 days of nursery in outdoor and indoor tanks, no statistical effect from the inclusion of AKO and AKO with HPK was observed on final mean survival (84.0%–91.8%), gained yield (1,568–1,611 g/m³), daily growth (14.2–14.2 mg/day) and feed conversion ratio (1.70–0.89), respectively. However, final shrimp BW was significantly improved with 50.0 g/kg AKO (775 mg) and 30.0 g/kg AKO with 80.0 g/kg HPK (629 mg), respectively, compared with control groups (711 and 567 mg). Resistance to osmotic and thermal stress was significantly increased with 10.0 g/kg AKO. Enhancement in growth performance and resistance may be related to a higher supply of dietary EPA, DHA and astaxanthin resulting from the inclusion of AKO and HPK.

中文翻译：

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日粮分级虾青素磷虾油和高蛋白磷虾粉对高强度苗圃培养后凡纳滨对虾幼体生长性能和抗逆性的影响

这项研究评估了日粮中虾青素磷虾油（AKO）和高蛋白磷虾粉（HPK）的饮食水平对南美白对虾对虾生长性能和抗逆性的影响。将3.6–2.5 mg体重（BW）的虾分别放在室外和室内水箱中，分别储藏了2,371–2,504 PLs m ^-3的虾。日粮中含有10.0、30.0和50.0 g / kg AKO（室外），30.0、50.0和70.0 g / kg AKO和80.0 g / kg HPK（室内）。在室外和室内水箱育苗52天和41天后，未观察到将AKO和AKO与HPK结合使用对最终平均存活率（84.0％–91.8％），增产（1,568–1,611 g / m ^{3）的统计影响。}），日增重（14.2–14.2 mg /天）和饲料转化率（1.70–0.89）。然而，与对照组（711和567 mg）相比，分别以50.0 g / kg AKO（775 mg）和30.0 g / kg AKO和80.0 g / kg HPK（629 mg）显着改善了最终虾的体重。10.0 g / kg AKO可以显着提高对渗透压和热应力的抵抗力。由于添加了AKO和HPK，因此日粮中EPA，DHA和虾青素的供应量增加可能会提高生长性能和抵抗力。