Six isocaloric semipurified diets were
formulated to contain graded levels of protein (240, 290, 340, 390, 440 and 490 g/kg). Each
diet was fed to triplicate groups of fish (initial body weight 1.93
±
0.02 g) in a recirculating
rearing system maintained at 26
±
1 ◦C for 8 weeks.