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This hydroponics style system uses no chemical fertilizers, creates no toxic waste to dispose of and is simple to build and operate.
The Raft System An (abbreviated) article from the Aquaponics Journal Lettuce in raft aquaponics
CEA - Closed Environment Agriculture By Erik Biksa A closed growing environment differs from the traditional grow room set-up in that it does not "connect" to the external environment and runs on a closed loop. Typically, grow room air is vented to the outside while outside air is drawn in to replace the air being evacuated.
The Theory The following diagram roughly summarises the theory of Aquaponics. Essentially the fish and the plants have a symbiotic relationship.