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This study aimed to evaluate the effects of biofloc technology (BFT) on the performance of common carp under high stocking density. Fish (8.41 ± 0.44 g) were stocked into 12 tanks (70 L) in a 2 × 2 factorial design consisting of clear water (CW) and BFT systems at two stocking densities. Fish were divided into four groups according to culture system and stocking density: CW6 (clear water, 6 kg m⁻³), CW12 (clear water, 12 kg m⁻³), BFT6 (biofloc, 6 kg m⁻³), and BFT12 (biofloc, 12 kg m⁻³). After 49 days, the fish were exposed to acute crowding stress (40 kg m⁻³) for 7 days to evaluate the fish performance to additional stressors. Total ammonia nitrogen (TAN) concentration was significantly lower in BFT groups at the end of the trial. The growth of fish was significantly higher and the feed conversion ratio was lower in BFT groups. The final density of fish was highest in BFT12 group (25.41 ± 0.48 …