An apparatus and method for producing an aquatically grown feed include at least one length of conduit having therein stratified water and gas. The water is periodically circulated through the conduit and the aquatic feed grows on the surface of the water. Downstream of the conduit, the aquatic feed and water are separated via a screen. The water is recirculated and the aquatic feed is harvested. The gas within the conduit is pressurized above atmospheric, thereby creating a hyperbaric growing environment for the aquatic feed. Further, carbon dioxide and/or ammonia can be injected into the gas while fertilizer and/or pH correction solutions can be injected into the water. A programmable control system can be used to regulate components of the apparatus.
