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Study on nutrient requirements of young eel for essential fatty acids

XU Zeng-hong1,XU Pao1,HUA Bo-xian2,BING Xu-wen1(1.Key Open Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology,Ministry of Agriculture,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences,Wuxi 214081,China;2.Jiangsu(Baoying) Fishery Science and Technology Demonstration Garden,Baoying 225800,China)  
L9(33) design method was applied to study nutrient requiremints of young eel for essential fatty acids(EFA).The experiment progress in extraventricular pond was divided into nine groups.The results indicate after breeding 40 d in due form,the maximal growth rate is 60.51 percent(weight) and 10.15 percent(length),the good requirements of C18:2n-6,C18:3n-3 and C20:5n-3 +C22:6n-3 to young eel is 1.33 percent,0.57 percent,0.24 percent,and the ratio of C18:2n-6/C18:3n-3,C18:2n-6/C22:6n-3 is 2.34,11.08.The EFA of eel demanding mostly is C18:2n-6.Furthermore,there is relative independence between weight and length growth of eel.The function of C20:5n-3 and C22:6n-3 is greater than C18:3n-3 on weight growth of eel,and that the function of C18:3n-3 is greater than C20:5n-3 and C22:6n-3 on length growth of eel.The study also indicates that the requirements of HUFA(C20:5n-3 and C22:6n-3)is lower to eel,and its exceeding addition in feed is not notable in effect on growth of eel.
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