An increased understanding of oxygen addition, consumption, and control in commercial recirculating aquaculture systems by the various physical, biological, and chemical components is of benefit for the growth of land-based aquaculture. The commercial profitability of these systems can be improved directly through decreased oxygen expenses or indirectly through better system performance.; This research was done at a commercial freshwater recirculating aquaculture system annually producing 400,000 Atlantic salmon (Salmo salar) smolt in New Brunswick, Canada. The expense of pure oxygen at this facility was approximately {dollar}25,000 per production cycle. The pure oxygen was stored in bulk on site and injected into the water by bubble diffusers and low head oxygenator (LHO) units. The only form of oxygen control was through manual control. The objectives of this research were to quantify the amount of pure oxygen gas used by the various components in this recirculating aquaculture system and to test the effectiveness and benefits of an automatic on/off oxygen control system. (Abstract shortened by UMI.)
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