The physicochemical analyses of water were performed throughout the entire cultivation in the Food Science Laboratory (LACA), with weekly readings of the dissolved oxygen and temperature by digital oximeter (QUIMIS-Q758P). pH was measured by a QUIMIS digital pH meter - both bench type - and elimination of salinity was read twice a week by a refractometer model BR11 from 0 to 3.5‰. The quality of water was maintained by daily renewal of 10% of the volume of each tank, and by siphoning, and elimination of waste and food debris.