This document describes a floating platform for integrated seaweed and fish farming that uses carbon dioxide from the fish farming process to stimulate seaweed growth. The platform has plastic sheets below to trap CO2 bubbles from diffusers, and sensors monitor pH, temperature and CO2 levels to control a valve supplying CO2 from storage to the seaweed area for optimal growth while maintaining fish welfare. Multiple platforms can be clustered for larger scale integrated aquaculture.