裂殖壶藻发酵粉对南美白对虾生长性能和肌肉营养成分的影响

The effect of dried algae Schizochytrium sp.on growth performance and nutrients in the muscle of white shrimp(Penaeus vannamei)

在南美白对虾基础饲料中分别添加0、0.2%、0.5%、1.0%和1.5%的裂殖壶藻发酵粉,研究其对南美白对虾生长性能和肌肉营养成分的影响。实验在30个网箱(1m×2 m×1 m)中进行,每个网箱放虾180尾,实验时间为60d。结果表明:0.5%裂殖壶藻发酵粉能有效提高个体增重和降低饲料系数,但裂殖壶藻发酵粉对南美白对虾增重率、成活率和饲料系数没有显著影响(P>0.05);裂殖壶藻发酵粉对南美白对虾肌肉灰分和粗脂肪含量无显著差异(P>0.05),但能显著影响肌肉中蛋白质的含量和粗脂肪中DHA的含量(P<0.05),1.0%组蛋白质含量最高,0.5%组粗脂肪中DHA的含量最高。实验条件下,裂殖壶藻发酵粉能改善南美白对虾的生长性能,提高肌肉的营养品质,推荐添加量为0.5%。

A 60 d study was conducted to evaluate the effect of Schizochytrium biomass （DHA-rich） on the growth performance and nutritional components in the muscle of juvenile white shrimp （Penaeus vannamei）. There were 5 treatments including control and control with Schizochytrium, five dietary levels （0% , 0.2% , 0.5% ,1.0% and 1.5% of diet） of Schizochytrium biomass. Each treatment had 6 replicates and each replicate had 180 shrimps（initial shrimp size was around 2.5 cm）. The results showed that： Although there are no statistical significant differences among all treatment groups in final body weight, body weight gain, relative weight gain, feed conversion and survival rate, the addition of DHA from Schizochytrium numerically improved body weight gain and feed conversion. There were no significant differences in the contents of crude fat and ash of muscles （P 〉 0.05 ）, but the crude protein and DHA in the crude fat were significantly higher than that of the control （ P 〈 0.05 ）. In conclusion, Schizochytrium biomass （ DHA-rich ） could improve the growth performance of the white shrimp, and improve the nutritional quality of muscle. The recommended dosage was 0.5%