Potyculture with "matrinchã" (Brycon sp.) and "jaraqui" (Semaprockilodus sp.) was carried out in two "terra firme" stream impoundments near Manaus with a water surface of approximately 6500 and 1500 m2 each. Dams were stocked with fingerlings captured in nature at a stocking rate of approximately 0.4 - 0.5 fish/m2 for each species. Fish were fed on a commercial chicken diet (18.5% crude protein, 5.4% crude, fat) with a daily ratio of 4% o{ the BAycon sp. biomass, up to a mean body weight of 250 g, when the daily feeding rate was reduced to 3% of the biomass. Fish growth and water quality were checked monthly. After a period of 307 days for one dam and 364 days for the second, a total biomass of 1035 kg and 506 kg was achieved, corresponding to a total calculated production of 3.7 and 3.4 t/ha/y, respectively.