Effects of feeding Macrobrachium rosenbergii postlarvae with a formulated feed enriched with four different media viz. vitamin E (feed F1), vitamin D (feed F2), cod liver oil (feed F3), astaxanthin (feed F4) on growth, survival and fatty acid composition of the postlarvae were investigated in comparison to the unenriched formulated feed (FC, control feed) using five groups of postlarvae with three replicates for each feed.Results showed that the postlarvae fed with cod liver oil enriched feed (F3) had the highest weight gain (225.72±9.05%), highest specific growth rate (2.95±0.07%), and highest survival (77.14±4.28%) as well as low food conversion ratio (0.87±0.03) compared to the postlarvae fed with the other feeds. The postlarvae fed with astaxanthin (F4) or vitamin E (F1) enriched feed also showed relatively higher percentage weight gain, higher specific growth rate and lower food conversion ratios but the larval survival was better in the group fed with astaxanthin enriched feed. Postlarvae fed with cod liver oil enriched feed contained the highest levels of eicosapentaenoic acid (EPA) (4.45±0.44%) in the body where as the highest levels of docosahexaenoic acid (DHA) and total highly unsaturated fatty acids (HUFA) in the body were observed in the postlarvae fed with astaxanthin enriched feed (F4) and vitamin E enriched feed (F1). The results indicate that the nutritional quality of formulated feed can be increased through enrichment, especially with astaxanthin or cod liver oil which could © Sri Lanka Association for Fisheries and Aquatic Resources M.G.I.S. Parakrama et al./Sri Lanka J. Aquat. Sci. 14 (2009): 59-74 60 improve the growth and survival of postlarvae of M. rosenbergii and the postlarval quality in relation to the fatty acid profile in the body.