Abstract: Combined fish farm and hydroponic network. The fish farm and hydroponic network are interdependent and operate on a constant body of water which is continuously circulated from the fish tank to the hydroponic network and back to the fish tank. The fish produce nitrogenous wastes which provide a constant source of nutrients for the plants. By removing the nitrogenous wastes, the plants serve as a filter to recycle the water for the fish. The fish tank also is equipped with a submerged biofilter with vertical channels and underlying air lines. Air bubbles rising through the channels produce a rolling current in the tank which agitates and aerates the tank water and at the same time provides oxygen to the organisms on the biofilter. The fish tank is enclosed in an insulated fish house to provide a self-heating fish farm which produces fresh fish year round. Likewise, the hydroponic network is enclosed in a greenhouse and provides a year round supply of organically grown fruits and vegetables.