饲料中磷脂含量对刺参生长和体成分的影响

Affection of diet phospholipid content on growth and body composition of sea cucumber,Apostichopus japonicus

以磷脂质量分数为0.05%,0.33%,0.65%,0.96%,1.23%,1.55%,2.08%的刺参(Apostichopus ja-ponicus)饲料分别饲喂刺参幼参(平均体质量为0.8 g),饲养31 d后,测定刺参的增重率、成活率、体成分以及实验刺参体内的磷脂含量。实验结果表明,饲料中磷脂的含量对刺参生长和体内磷脂质量分数有明显影响。随着饲料中磷脂质量分数的增加到0.65%时,实验刺参的增重率逐渐增加到最大值111.13%,而后则不再增加;刺参体内的磷脂质量分数在饲料中的磷脂质量分数达到0.33%时即接近最大值,达到3.20%,而当饲料磷脂质量分数继续升高时,也不再明显增加。实验刺参体内粗蛋白、粗脂肪及粗灰分在各处理间没有显著差异。因此刺参对饲料磷脂的需求量应为0.65%。

Sea cucumber （Apostichopus japonicus） juveniles, with an average weight of 0. 8 g, were fed with tested diets designed with gradient level of phospholipid （0.05%, 0.33%, 0.65%, 0.96%, 1.32%, 1.55%, 2.08%） for 31 days. After 31 days＇ feeding experiment, weight gain （WG）, survival and body composition such as crude protein, crude lipid, crude ash and phospholipids were determined. The results showed that the WG and phospholipids content of sea cucumber juveniles were affected by dietary phospholipids significantly. The WG reached 111. 13% when the dietary phospholipids content was 0. 65%, and then leveled off when dietary phospholipids further increased. The phospholipids content reached 3.20% when dietary phospholipids was 0.33% and hadn＇t increased significantly when dietary phospholipids further increased. There was no significant difference of contents in crude protein, crude lipid and crude ash between the different treatments. Thus, the optimum dietary phospholipids requirement of sea cucumber, Apostichopus japonicus, was suggested to be 0.65 %.