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Effects of unsaturated fatty acids on the growth and immunity indices of Monopterus albus

YANG Yuan-jie,BING Xu-wen,XU Zeng-hong (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)  
The orthogonal diagram was applied to design the dose of additive according to the factors of linoleic acid,linolenic acid and EPA +DHA.The feedstuff contained no fatty acids as basic component and above additive were fed to Monopterus albus community from Baoying lake.The data on feedstuff was collected and analyzed by SPSS11.5.The result showed as follows:C18:3n-3 was the first limiting factor to weight gain rate and increase rate of Monopterus albus.C18:2n-6 and EPA+DHA were the inferior factors.C18:2n-6 was the main factor to fatness.EPA+DHA had some effects on liver-somatic index though which had no effects on survival rate.The activity of lysozyme enhanced in some way.The correlation between phagocytic capacity of haemocyte and phagocytic indices was significantly,improved the non-specific immunity of Monopterus albus significantly.It could be concluded that the optimum content of C18:2n-6,C18:3n-3 and EPA+DHA were 1.30%,1.55%,0.25%,respectively.
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