Studies On The Nutrition Of Lipids For Marine Fish Larvae

Red sea bream(Pagrus major) larvae and Japanese flounder(Paralichthys olivaceus)larvae were used as the subjects of our experiments. A series of experiments wereconducted to study the nutrition of lipids for marine fish larvae, according to themethod of microdiets. The main conclusions were shown as followed:1. When the addition of natural fish oil to microdiet was equal to that of ethyl esters offish oil, or when the contents of n-3HUFA in microdiets were similar, after the feedingexperiment, the total length and survival of red sea bream larvae fed with microdietadded with natural fish oil were better than those of red sea bream larvae fed withmicrodiets added with ethyl esters of fish oil. Furthermore, the contents of n-3HUFAand DHA of the total fatty acids in the bodies of red sea bream larvae fed withmicrodiet added with natural fish oil were higher than those of the total fatty acids inthe bodies of red sea bream larvae fed with microdiets added with ethyl esters of fishoil. That indicated the digestion and absorption of natural fish oil for red sea breamlarvae were superior to those of ethyl esters of fish oil.2. Under the experimental conditions we utilized, the growth and survival of red seabream larvae fed with two groups of microdiets with DHA/EPA≥2.30/1 weresuperior to those of red sea bream larvae fed with the other two groups of microdietswith DHA/EPA≤2.00/1. Therefore, DHA/EPA≥2.30/1 should be the optimal ratio ofDHA/EPA in microdiets for red sea bream larvae. The analytical results of relativecomponents in the bodies of red sea bream larvae showed, with the increase ofcontents of DHA in microdiets, the contents of DHA in the bodies of red sea breamlarvae also increased.3. When the added amounts of lecithin in microdiets for red sea bream larvae were not 2英文摘要over 5.0%, with the increase of the added amounts of lecithin in microdiets, thegrowth, survival, the contents of n-3HUFA and DHA of total fatty acids in the bodiesof red sea bream larvae and the tolerance of red sea bream larvae to different stressesalso increased. However, when the added amounts of lecithin in microdiets for red seabream larvae were over 5.0%, the above indexes didn't increase. Hence, under theexperimental conditions, the optimal added amount of lecithin in microdiet for red seabream larvae was about 5.0%.4. Our microdiets were able to replace over 70% of rotifers and Artemia; The survivalof Japanese flounder larvae fed with our microdiets exceeded that of larvae fed withlive food; The growth of larvae fed with our microdiets was equal to or surpassed thatof larvae fed with live food; The albinism rate of larvae fed with our microdiets wasobviously lower than that of larvae fed with live food; The immunity of larvae wassignificantly strengthened.