The objective of this work was to determine the adequate stocking density to second growth phase of matrinxã (Brycon amazonicus) in cage. Fish has been stocked in 12 cages with 1 m³ each in four different densities 200, 300, 400 and 500 fish m-3. Fish were fed on commercial diets with 34% of crude protein during 60 days. Growth and productivity parameters were evaluated. There were no differences in weight and length. The production per area was significantly higher in the density of 500 fish m-3, considered then the most adequate to the second growth phase in cage.
fish culture; production; stocking density
