| 摘要: |
| 于1996年9–10月在中国水产科学研究院黄海水产研究所小麦岛实验基地,采用人工投喂的方法,给牙鲆幼鱼投喂含不同含量n-3高度不饱和脂肪酸（n-3HUFA）的人工饵料,研究牙鲆幼鱼对饵料中n-3HUFA的消化、吸收以及n-3HUFA的含量与日增重率、饵料效率的关系。结果表明,在饵料中添加0.60％–2.40％的n-3HUFA可有效提高牙鲆幼鱼的日增重率和饵料效率;肝脏中n-3HUFA的含量与饵料中n-3HUFA（尤其是DHA）的含量成正比;牙鲆幼鱼对饵料中n-3HUFA的表观消化吸收率随其含量的增加呈下降趋势。 |
| 关键词: 牙鲆幼鱼 n-3HUFA 日增重率 饵料效率 |
| DOI： |
| 分类号: |
| 基金项目:国家攀登计划B资助项目，PDB-6-1-3号 |
附件 |
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| PRIMARAY STUDY ON THE RELATIONSHIP BETWEEN ABSORPTION OF N-3HUFA AND GROWTH IN THE LEFTEYE YOUNG FLOUNDER PARALICHTHYS OLIVACEUS (T. et S.) |
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LIU Hong-jie, MAO Xing-hua
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First Institute of Oceanography, State Oceanic Administration, Qingdao, 266003
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| Abstract: |
| In the study five groups of the juveniles (body length 6.0-8.0cm) of the lefteye young flounder [Paralichthys olivaceus (T. et S.)] were fed with artificial diets consisting of the Peru fish meal (content 80%) and dixtrim (content 20%) as the main material and 0.0%, 0.60%, 1.20%, 1.80% and 2.40% of n-3HUFA were added into the diets, respectively. The experiment lasted for 35 days and the results are given as follows:
(1) With an increase in the n-3HUFA content in the diets, the rates of the daily increase in body weight and the rates of diet efficiency of all the young showed an ascending tendency. When the addition of n-3HUFA to the diet amounted to 2.4%, the daily rate of the weight increase for the flounders increased from 1.14% of the control group (without addition of n-3HUFA) to 1.73%, and the diet efficiency increased from 43.73% for the control group to 74.52%, the daily increase in body weight of the flounder increased, respectively, 54.4% and 70.5% as compared with those of the control group. Hence, n-3HUFA can effectively promote the growth of the young flounders and enhance the diet efficiency. As to the appropriate amount of addition of the n-3HUFA to the diets, the experiment showed that the flounders did not show any bad reaction and both the rate of daily body weight increase and the diet efficiency showed a positive effect.
(2) In the livers of the juvenile flounders, the relative percentage content of n-3HUFA showed an ascending tendency with the increase of n-3HUFA in the diet. When the addition of n-3HUFA reached 2.4%, the content of n-3HUFA, EPA and DHA increased, respectively, by 47.4%, 19.2% and 60.7%, as compared with those of the control group. The positive capsulation between the DHA content and that of n-3HUFA in the diet was apparently greater than that of EPA, showing a close relationship between DHA and the growth of the flounder.
(3) Along with an increase in the n-3HUFA content in the diet, the apparent digestive and absorptive rates of n-3HUFA of the juvenile flounders showed a descending tendency. When the addition of n-3HUFA reached 2.4%, the apparent digestive and absorptive rates of DHA of the flounder dropped from 87.20% for the control group to 77.85%, but those of the EPA and DHA of the same diet group were very close to each other. When the addition of n-3HUFA to the diet was over 0.6%, the increase of the relative percentage content of n-3HUFA in the livers of the flounder began to drop. Because the feeding rates of the flounders in the four diet groups were similar, the drop of the relative percentage content of n-3HUFA in the livers should be directly related to the drop of the digestive and absorptive rates of n-3HUFA of the flounders. |
| Key words: Paralichthys olivaceus (T. et S.) larvae, n-3HUFA, Daily rates of the weight increase, Diet efficiency rates |
