尼罗系吉富罗非鱼(Oreochromis niloticus)幼鱼实用日粮中蔗糖糖蜜的养殖效果与血糖代谢变化

AQUACULTURE PERFORMANCE OF SUGARCANE MOLASSES IN PRACTICAL DIETS AND CHANGE OF BLOOD SUGAR ON JUVENILE GENETIC IMPROVEMENT OF FARMED TILAPIA STRAIN OF NILE TILAPIA (OREOCHROMIS NILOTICUS)

采用6种等蛋白质(34.4%)、等能量(16.10MJ/kg)试验日粮,研究了尼罗系吉富罗非鱼幼鱼实用日粮中蔗糖糖蜜替代小麦次粉的养殖效果与血糖代谢变化。结果表明,56d试验期间各试验组鱼均无死亡;蔗糖糖蜜替代小麦次粉40%—100%日粮组鱼的摄食量、特定生长率、饲料效益和蛋白效益均高于小麦次粉组鱼,当蔗糖糖蜜100%替代小麦次粉时,其摄食量、特定生长率和饲料效益蛋白效益比均显著性上升(P<0.05)。各试验组鱼鱼体营养成分(蛋白质、脂肪、灰分和水分)和肝体指数无显著性差异(P>0.05),肝脏结构正常。蔗糖糖蜜组鱼血浆中血糖、总蛋白、胆固醇、甘油三酯含量明显高于小麦次粉组鱼(P<0.05)。本试验结果认为,蔗糖糖蜜在尼罗系吉富罗非鱼幼鱼实用日粮中可以完全替代小麦次粉,蔗糖糖蜜对尼罗系吉富罗非鱼幼鱼具有较好的生长效益、节约日粮蛋白质效益和适口性,其主要原因与摄食蔗糖糖蜜后尼罗系罗非鱼幼鱼产生的较长时间高血糖现象有关。

We have studied the aquaculture performance of sugarcane molasses in juvenile Genetic Improvement of Farmed Tilapia strain of Nile tilapia （Oreochromis niloticus） practical diets by progressively increasing its inclusion level at the expense of wheat middling in isonitrogenous （34.4% crude protein） and isoenergetic （16.10MJ/kg） formulated diets. The test results indicated that the survival did not differ among treatments （P0.05） during the test period （56 days）. The intake, growth and feed conversion ratio of fish fed 20% SMS diet showed significantly better than fish fed 20% wheat middling diet （P0.05）. No significant difference with carcass nutrient contents （protein, lipid, ash and moisture） was found among the treatments. The contents of glucose, total protein, cholesterol, triglyceride in serum at fish fed 20% SMS diet were all significantly higher than fish fed 20% wheat middling diet （P0.05）. Results showed that Wheat middling could be entirely replaced by sugarcane molasses in practical diets of juvenile without compromising growth or feed conversion ratio. The higher blood sugar in fish after intake sugarcane molasses diet could be the major cause on positive growth performance and feed conversion ratio in juvenile GIFT strain of Nile tilapia.