研究二甲基-(-丙酸噻亭(DMPT)、氧化三甲胺（TMAO）、甜菜碱和肌苷酸钠（IMP）对初重 9.39±0.26 g 哲罗鲑(Hucho taimen)摄食、生长、体成分、消化酶和血清生化指标的影响。哲罗鲑在室内玻璃钢水族箱中流水饲养，试验设1个对照组，4个处理组，每处理组3个重复，每重复50 尾，养殖周期56 d。试验期间水温9.3~14.2℃，溶氧>8.0 mg·L-1。试验结果表明，在低鱼粉饲料中添加0.2% DMPT、0.2% TMAO和0.2%甜菜碱后，哲罗鲑增重率和特定生长率显著提高（P<0.05），而添加0.05% IMP后哲罗鲑增重率和特定生长率未呈显著变化（P>0.05）；添加0.2% DMPT后哲罗鲑鱼体粗蛋白水平升高(P<0.05)；添加0.2% TMAO和0.2%甜菜碱后，鱼体粗脂肪水平降低(P<0.05)，添加0.05% IMP对鱼体成分无显著影响(P>0.05）；添加0.2% DMPT和0.2% TMAO后消化道消化酶活性提高（P<0.05）；添加0.2%甜菜碱后，消化道脂肪酶活性显著升高（P<0.05）；添加0.2% DMPT后血清总蛋白、白蛋白和球蛋白水平显著升高(P<0.05)；添加0.2% TMAO和0.2%甜菜碱后，高密度脂蛋白含量显著升高（P<0.05），胆固醇、甘油三酯、低密度脂蛋白含量显著下降（P<0.05）；添加0.05% IMP后，血清补体C3和C4水平显著提高（P<0.05）。结论是饲料中添加0.2% DMPT、0.2% TMAO和0.2%甜菜碱对哲罗鲑具有促摄食和生长效果，有利于改善体成分和提高机体消化能力；饲料添加0.05% IMP对哲罗鲑促摄食和生长效果不明显，但有益于改善鱼体免疫状况。
The taimen with initial body weight of 9.39±0.26 g were used to conducted a 56 days growth experiment for studying the effects of four feeding attractants（dimethyl-β-propiothetin, trimethylamine oxide, betaine and sodium-5’-inosinate）on feed intake, growth performance, body composition, digestive enzyme activities and serum indices. Fishes were raised in water flow system. There were 5 diets, and each diet was randomly assigned to triplicate groups of 50 fishes. During the experiment, the water temperature fluctuated from 9.3℃ to 14.2℃ and the dissolved oxygen was above 8.0 mg·L-1. The results showed that the weight gain rate and specific growth rate of the taimen increased significantly by adding 0.2% dimethyl-β-propiothetin, 0.2% trimethylamine oxide, and 0.2% betaine, but there were no changes by supplementing 0.05% sodium-5’-inosinate（P>0.05）. The body crude protein increased significantly by supplementing 0.2% dimethyl-β-propiothetin (P<0.05), and body crude lipid decreased significantly by adding 0.2% trimethylamine oxide and 0.2% betaine (P<0.05), but body composition had no changes by supplementing 0.05% sodium-5’-inosinate (P>0.05).The digestive tract enzyme activities increased significantly by adding 0.2% dimethyl-β-propiothetin and 0.2% trimethylamine oxide（P<0.05）, and the digestive tract lipase increased significantly by supplementing 0.2% betaine (P<0.05), but digestive enzyme activities had no changes supplemented 0.05% sodium-5’-inosinate (P>0.05). The plasma total protein, albumin and globulin increased significantly when added 0.2% dimethyl-β-propiothetin (P<0.05), and the high density lipoprotein content increased, but cholesterol, triglyceride, low density lipoprotein decreased significantly when added 0.2% trimethylamine oxide and 0.2% betaine (P<0.05), and plasma complement 3 and complement 4 increased significantly supplemented 0.05% sodium-5’-inosinate (P<0.05). In conclusion, the food intake, growth performances, body composition and digestive ability of taimen were improved by adding the basal diets with 0.2% dimethyl-β-propiothetin, 0.2% trimethylamine oxide and 0.2% betaine, respectively (P<0.05), but not 0.05% sodium-5’-inosinate. The immunity of body were improved supplementing 0.05% sodium-5’-inosinate.