Study was conducted to assess the problem of Heterogeneous Individual Growth(HIG) restricting larger average harvest size right from the beginning i.e. nursery phase of prawn culture. Experiment of 60 days was conducted to assess the effect of different stocking densities and variation in dietary protein of formulated diet on the morphotypic differentiation among the nursed juveniles of M. rosenbergii. Post larvae (PL20) were stocked in 300 l tanks at stocking densities S1=1/10 l, S2= 2/10 l and S3= 3/10 l and fed with two formulated feeds having different dietary proteins; P1 with 35% protein, and P2 with 40% protein. After 60 days, among the 6 treatments (S1P1, S1P2, S2P1, S2P2, S3P1 and S3P2), three morphotypes were divided according to length i.e. M1≤4.0cm, M2=4.1-4.5cm and M3>4.5cm. Among these treatments, S2P2 was found to have best survival for third morphotype (M3) i.e. 52.84±5.12 with better growth parameters than morphotypes of other treatments. Overall survival rate in treatment S2P2(79.33±3.06) was observed to be less than that of treatment S1P2(90.67±2.31) but higher than other four treatments. Weight gain, specific growth rate, feed conversion ratio and protein efficiency ratio in treatment S2P2 were also observed to be better among all treatments.Amino acid profile of body of morphotypes from treatment S2P2was found to have only trending difference amongarginine, leucine and methionine, with lowest levels from third and highest from first morphotype.