Hydroponics, called aquaponics when fish are involved, is a system that grows food plants floating in small foam blocks on the surface of the water with their roots in nutrient-rich water. The fish are fed daily, and their waste nutrients are used to fertilize the roots of the plants. Vegetables are harvested regularly and fish occasionally. No pumps or fossil fuels are required, the structure is minimal and long lasting, and the whole system is ecologically stable.
For more information, read An Integrated Fish Culture Hydroponic Vegetable Production System by Ron Zweig
Aquaculture Magazine, May/June 1986