豆油代替鱼油对哲罗鱼稚鱼生长和体成分的影响

研究不同比例豆油取代粗制鱼油对哲罗鱼（Hucho taimen）稚鱼生长和体成分的影响。实验分4个组，每组设3个重复，每个重复100尾稚鱼（体质量7～8g）。第1组（G1）为对照组，添加15％鱼油，第2组（G2）、第3组（G3）和第4组（G4）分别用5％、10％和15％豆油取代鱼油。实验进行8周。结果表明，不同处理成活率和平均日增重差异不显著（P〉0．05），但随着豆油比例的增加，特定生长率和肥满度都得到提高，G3和G4组特定生长率显著高于G1组（P〉0．05）；G4组肥满度显著高于G1组（P〉0．05）。G3、G4组饵料系数显著降低（P〈0．05）。不同处理体成分中水分、粗蛋白质和粗脂肪含量均差异不显著（P〉0．05）。实验表明，豆油作为脂肪源可以完全代替鱼油用于哲罗鱼稚鱼饵料生产。

Effects of soybean oil as replacement of fish oil in diet on growth performance and body composition of juvenile Hucho taimen

Dietary lipids are major source of energy and also provide essential PUFA for fish.But the resource of fish oil,which was the major source of dietary lipid,was scarce.So it's important to find a replacement for fish oil in aqua-feed.In this study,four treatments were designed and three replicates were set in each treatment,each with 100 juvenile fish(body weight 7-8?g)in each replicate.G1 was set up as the control group,with 15% fish oil added in,and treatments G2,G3 and G4 used 5%,10% and 15% soybean oil respectively as the replacement of fish oil.The experiment was conducted for eight weeks.The results showed that there were no differences in survival rate(SR) and daily weight gain(P>0.05)among different treatments,but specific growth rates(SGR) and condition factors were significantly improved when the soybean oil level was increased,and feed conversion ratio(FCR) decreased in G3(P>0.05)and G4(P<0.05);SGR increased in G4 and G3 significantly(P<0.05) and conditionfactors increased significantly in G4.The moisture,crude protein and crude fat content of fish body were not different among different treatments(P>0.05).The conclusion is that soybean oil can replace fish oil completely and can improve the production of juvenile Huchotaimen,which is very significant in feed producing of H.taimen.Journal of Fishery Sciences of China,2006,13(6):(1?023)-(1?027)]