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中文摘要：
研究二甲基-β-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±0．26g哲罗鲑（Huchotaimen）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56d。喊验期间水温9．3-14．2℃，溶氧〉8．0mg·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。
英文摘要：
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, grow
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