Gurami sago, Osphronemus goramy strain is the result of newly released domestication in 2018. This species is freshwater fish native in Indonesia and has a high price in the markets. This study investigated the effect of stocking density on growth performance, body carcass composition and biometric indices of juvenile gurami sago in the synthetic sheet pond. Fish were stocked at densities of 10, 15 and 20 ﬁsh/m3 in synthetic sheet pond with three replicate. Fish were fed with commercial feed containing 29% crude protein and gross energy of 3,340.50 kkal/kg of feed and cultured for 90 days. The physicochemical parameters of water were always at satisfactory levels for ﬁsh culture throughout the experiments except for NH3-N (0.05 mg/L) and NO2-N (0.02 mg/L): water temperatures ranged from 27.5 to 30.5 °C, DO 4.3 to 5.6 mg/L, pH 6.56 to 6.96, alkalinity 50.65 to 52.25 mg/L, and hardness 6.65 to 66.85 mg/L. Survival was high at 100.0% in synthetic sheet pond at 10, 15 and 20 fish/m3, respectively. Density signiﬁcantly affected (p<0.05) ﬁnal mean weight (164.72±2.20, 155.34±1.40, 138.40±0.98 g) and percent weight gain (113.04±5.10, 100.89±3.41, 78.98±2.63%), speciﬁc growth rate (0.84±0.03, 0.78±0.02, 0.65±0.02%/day), apparent food conversion ratio (1.69±0.03, 1.74±0.02, 1.85±0.03), and condition factors (1.48±0.05, 2.56±0.03, 2.75±0.04). In contrast, the protein of carcass (19.02±0.11, 18.44±0.12 and 17.82±0.15%), hepatosomatic and visceral fat index were not significantly (p>0.05) affected by stocking density. The high survival and fast growth rates of gurami sago stocked demonstrated that the synthetic sheet ponds are a viable alternative method as standard ponds for the commercial production of gurami sago.