饲料中添加螺旋藻对凡纳滨对虾生长、体组分的影响

系统研究了饲料中添加0～5％不同水平的螺旋藻对凡纳滨对虾生长性能与体生化组成的影响。结果表明：（1）螺旋藻能促进对虾生长，提高饲料的消化利用率，以0．8％、1．5％螺旋藻添加组凡纳滨对虾生长性能较好，试验中期、末期增重率分别达到926．10％、959．78％和4382％、4353．3％，与对照组相比，虾体增重率分别提高2．82％、6．56％和3．45％、2．77％。结合饲料利用、虾体生化组分分析结果表明，饲料中添加0．8％水平螺旋藻为最佳。凡纳滨对虾肝体指数（HSI）随螺旋藻添加量的增加呈现下降趋势。（2）在1％螺旋藻添加范围内，虾体EPA含量内（Y）与螺旋藻添加量（X）呈现良好的线性关系（YEPA=2．4275X＋4．5975，R0=0．9611），在0．8％范围内螺旋藻，虾体中DHA、ARA的含量与螺旋藻添加量呈显著线性相关（yDHA=4．668X＋5．6545，R^2=0．9631；YARA=105．58X＋0．3241，R^2=0．9749）。（3）从虾体DHA、EPA和ARA含量分析，0．5％大蒜添加量与5％螺旋藻添加量的对虾体脂肪酸改善效果相当。

Effects of Spirulina in diet on growth, amino acid and fatty acid profile of Litopenaeus vannamei

Fed with feeds containing seven levels of Spirulina platensis(0,0.2%,0.5%,0.8%,1.5%,3%,5%) for 8 weeks respectively,the grouped Litopenaeus vannamei were weighed and counted on the 28th and on the 56th day.And the body composition(crude protein,amino acid,fatty acid,etc.) and hepatopancreas somatic index(HSI) were investigated at the end of the experiment.When the dietary level of Spirulina platensis was 0.8% and 1.5%,the shrimps had more rapid weight gain(WG) with the 28th WG 926.10%,959.78% respectively and the 56th 4382%,4353.3%.And when the dietary level of Spirulina platensis was 0.8%,the feed conversion ratio(FCR) was 1.32,the lowest;and protein efficiency ratio(PER) was 1.296,the highest.The EPA content of the shrimp body(Y) had good linear relationship with the S.platensis supplementing level(X) within the 1% addition level(Y_(EPA)=2.4275X 4.5975,R~2=0.9611),at the same time,the DHA and ARA content had remarkable linear relationship with the S.platensis within the level of 0.8%(Y_(DHA)=4.668X 5.6545,R~2=0.9631;Y_(ARA)=105.58X 0.3241,R~2=0.9749).The HSI of the shrimp had the decrease tendency along with the increase of the dietary level of S.platensis.These results showed that the S.platensis had some beneficial grow performance and the digestive/absorbent rate,especially when the addition level was 0.8%.The S.platensis had remarkable effect on the deposition of high unsaturated fatty acids(HUFAs).According to the equation of dietary level of S.platensis and HUFAs,when the level was 3.67%,the total contents of HUFAs of shrimps peaked.