In this study, four densities 1, 3, 5 and 7 ind./ml were experimented in order to identify a suitable density for rearing triploid Pacific oyster from the stages of Veliger to Spat (15 days). Results showed that the highest absolute growth rate and relative growth rate of the oyster larvae gained at the densities of 1 and 3 ind./ml, followed by the density of 5 ind./ml and lowest at the density of 7 ind./ml (p 0.05). The highest survival rate of the oyster larvae was at the density of 3 ind./ml (p 0.05). However, there was no significant difference about survival rate between the density of 5 ind./ml and those of the densities 1 and 7 ind./ml (p 0.05). From the results of this study, it can be suggested that the appropriate density for rearing the triploid Pacific oyster larvae was 3 ind./ml in order to optimize the growth, survival rate and tank rearing squares.