In a previous study, the water consumed in BFT treatments, with no water exchange and using dextrose as a carbon source (6.49 ± 0.79 L per thousand PL5 produced) required approximately 12% of the water used by the conventional system (56,22 ± 3,31 L per thousand PL5) (Lorenzo et al., 2015). In the present study, the water consumption (Table 3) in the two higher stocking densities of BFT was reduced by about 40% from the previous BFT system, with consumption limited to only 8% of the water used by the conventional system.