Hi-Tech to "Farm" Tuna

"Honolulu-based Hawaii Oceanic Technology has developed what it calls a “revolution in open ocean aquaculture technology”: A 200-foot-wide spherical enclosure — dubbed the “Aquasphere” — that can be used to farm fish in deep waters, offshore."

http://venturebeat.com/2008/06/05/hawaii-oceanic-technology-pushes-concept-of-sustainable-aquaculture/