Traditional aquatics uses the wastewater from fish farms to grow hydroponic vegetables. Now scientists at Israel’s Ben Gurion University have also made use of the solid waste from fish by means of anaerobic digestion. The new system produces biogas, higher crop yields, using less energy and less water.
https://www.sciencedirect.com/science/article/abs/pii/S0921344924003100?via%3Dihub