Aquaponics systems can range from countertop aquariums to 10,000 sq. ft. facilities with hundreds of tanks holding hundreds of gallons of water. Since aquaponics is a soilless form of agriculture, actual earth and ground isn't the kind of land consideration you'd need to make. A healthy aquaponics system with the right equipment can live on a rooftop, in a greenhouse in a small yard, or in giant repurposed industrial buildings.
The space needed will largely depend on the kind of fish that you intend to grow and harvest, as plants are able to be planted much more densely than they would in the ground. The larger the fish, the more water they'll need to move around in. Each pound of fully grown fish requires about 8 gallons of water.
