The effect of partial substitution of fish meal with a high-value soybean meal and a commercial soybean meal on the growth performance in juvenile Japanese seabass (8.3±0.2 g body weight) were determined. Nine isonitrogenous (crude protein 44%) and isoenergetic (20 kJ/g) practical diets replacing 0, 15%, 30%, 45% and 60% fish meal protein with soybean meal protein were formulated. Diets were fed twice daily for 10 weeks to four replicate cages of fish. Growth and feed utilization were significantly reduced when the substitution level was 45% or more in commercial soybean meal and 60% in high-value soybean meal compared to the fish fed the control diet. The researchers concluded that these results indicated that protein in conventional soybean meal could substitute for 30% fish meal protein, while the substitution level of higher value soybean meal protein could be 45%, which did not influence the growth performance of juvenile Japanese seabass.