Biofloc developed in indoor fiberglass reinforced plastic (FRP) tanks (1000 L) was used as dietary supplement for P. monodon (2.90 ± 0.10 g) reared in 1000 L FRP tanks. Graded level of dried biofloc was included in shrimp basal diets; 0 (B0, control), 4(B4), 8 (B8) and 12% (B12).