Average individual weight gain (0.89–0.91 g) was higher and feed conversion (2.6–3.1 g) was lower in fish in the MOD system, than weight gain (0.54–0.55 g) and FCR (4.1–4.6) of FHM in the LOW system. Feed conversion was also lower in fish fed the prebiotic diet (2.6–4.1) than the basal diet (3.1–4.6).