饲料中添加虾青素对斑节对虾生长和免疫指标的影响

 虾青素以不同质量分数(0，10，20，40，80，160 mg·kg^-1)添加到斑节对虾 Penaeus monodon 的饲料中投喂30 d，研究虾青素对斑节对虾［初始体质量（1.32±0.03 ）g］生长、存活和免疫指标的影响。结果显示：虾青素可提高斑节对虾的存活率，但无明显规律性；而增质量率和特定生长率，实验组和对照组间差异显著(P<0.05)；就终末均质量而言，实验组与对照组差异显著(P<0.05)，但实验组之间无显著差异(P>0.05)；虾青素可提高斑节对虾酚氧化酶（PO）的活力，除10 mg·kg^-1和20 mg·kg^-1 组外，其余实验组与对照组差异显著(p<0.05)，但对碱性磷酸酶(ALP)、过氧化物酶(POD)、超氧化物岐化酶(SOD)的活力无显著影响。以增重率、特定生长率和酚氧化酶（PO）活力为参考指标，虾青素适宜添加量为40～80 mg·kg^-1。

Effects of Dietary with Astaxanthin on Growth and Immunological Parameters of Black Tiger Shrimp, Penaeus monodon.

The astaxanthin was added to the feed of black tiger shrimp Penaeus monodon (initial body weight(1.32±0.03) g)with different levels (0, 10, 20, 40, 80 and 160 mg·kg^-1)for 30 days, which aim to determine the effects of astaxanthin on growth, survival and immunological parameters. The results show that astaxanthin increased the survival rate ,but did not get regularization;weight gain rate and the specific growth rate(SGR), which were significantly higher in the experimental groups than the control one(P<0.05); on the final body weight gain, were significantly difference in the experimental groups than the control (P<0.05), but not significantly difference between the experimental groups(P>0.05)；astaxanthin significantly increased the activity of phenoloxidase (PO) in the shrimp serum(P<0.05) except for 10 and 20 mg·kg^-1 groups , but did not significantly influence the activity of peroxidase (POD), Superoxide dismutase(SOD) and alkaline phosphatas（ALP）in the shrimp serum. Based on weight gain rate, specific growth rate (SGR)and phenoloxidase (PO) capability, supplement of astaxanthin may be 40～80 mg·kg^-1.