Aquaponics is a combination of hydroponics and aquaculture. Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Aquaculture is fish farming. Aquaponics combines the two together and instead off adding mineral nutrient solutions, the fish waste feed the plants being grown. The plants in turn cleans the water for the fish forming a symbiotic relationship where each other depends on the other. The water is circulated from the fish tank to the grow beds or troughs and returned to the fish tank.
Some Pictures of a system we helped develop in Florida