The biofloc technology (BFT) production system results in high yields of aquatic animals because two important production-limiting factors, dissolved oxygen and total ammonia-nitrogen concentrations, are maintained at near-optimal levels despite high stocking and feeding rates (Avnimelech, 1999, Burford et al., 2004 and Hargreaves, 2006). High dissolved oxygen concentration is maintained by continuous aeration, which also maintains the biofloc suspended in the water column.