Growth performance and survival of pacu larvae fed diets containing different levels of vitamin C were evaluated for 15 days. The experimental diets were formulated to contain approximately 40.00% crude protein and 4000kcal of digestible energy/kg diet based on the feedstuffs values reported by NRC (1993) and 4 levels of ascorbic acid, 125, 250, 500 and 750mg/kg diet. Pacu larvae with 0.0132 ± 0.0077g were stocked into 12 aquaria (12-L) at 15 larvae/aquarium. The results of this study indicate that weight gain and survival percentage were significantly higher for fish fed diets supplemented with 250mg of vitamin C/kg.