Cosmic Dancer and I took a visit to a local commercial aquaponics company. His operation was quite impressive. In a greenhouse of 40' X 200', he was growing 40,000 lettuce plants and farming rainbow trouts (17 inch size), with product shipments on a weekly basis. The system looked pretty complex with computer control of the total environment from temp, humidity, and had separate hydroponic and fish tank control to maximize production.
The owner is available for design of a custom system or consulting. We would not need such an optimized system, so could be simpler, and grow different vegetable varieties. His website is at:
http://www.cultures-aquaponiques.com/