A growth study was conducted to investigate the effect of stocking density on performance of juvenile fat cod (Hexagrammos otakii Jordan et Starks.). Fish averaging 13 g were stocked into duplicate tanks ($250;{ell}$ each) at four different densities of 330 g/$100;{ell},;660;g/100;{ell},;990;g/;100;{ell}$, and $1330;g/100;{ell}$, and fed MP diet containing $50\%$ frozen horse mackerel and $50\%$ commercial binder meal for 2 months. Weight gain, feed efficiency, survival rate, and protein retention were decreased as density increased. Whereas these parameters were not significantly different (P>0.01) fish stocked at initial stocking densities of $330;g/100;{ell},;660;/g/100;{ell};and;990;g/100;{ell}$. Moisture and lipid content of whole body were not affected by stocking densities (P>0.01). These results indicate that stocking density should be considered, and $1{~}2$ kg fish/$100;{ell}$ final stocking density for juvenile fat cod could be used to decrease production cost for the indoor tank (culture) system.