A study was conducted for a period of 45 days to evaluate the efficiency of egg custard in substituting Atemia nauplii for post larvae production of giant fresh water prawn, Macrobrachium rosenbergii. Three Treatments were designed for feeding with three replications as follows: (i) Treatment Ti, alternate diet (1st 10 days only Artemia then only egg custard), (ii) Treatment T2, combined feed (Artemia and egg custard) and (iii) Treatment T3, egg custard. Stocking density of larvae was 50/liter. Larvae cultured on combined diets had the highest ( P<0.05) mean production rate 26.07±1.13 /I with a corresponding survival of 52.13±2.14%. The post larval yield for the group of larvae fed egg custard alone was nil. This result indicate that rearing of M. rosenbergii larvae using only custard is not possible. During the feeding of combination diet it was observed that larvae were not fed artificial feed before 7 days of rearing Period, artificial feed. The survival rate of larvae fed alternate diet (7.27±0.08%) was significantly lower (P<0.05) than the survival rate of larvae fed combined diet (52.13±2.14%). It indicate that egg custard alone (after 10 days) might not be adequate diet as Artemia for higher production of M. rosenbergii post larvae. It is concluded from the present study that combined diet (Artemia and custard) can be used for larvae rearing of M. rosenbergli and custard can be used after 10 days of rearing period with Artemia.