Big Akwa is a food-tech innovation start-up that economically and environmentally revolutionizes land-based aquaculture by introducing industrial symbiosis between the aquaculture and the process industry. Our solution introduces an efficient circular approach to the fish production based on industrial symbiosis. Low temperature waste heat from the plant is used to warm up fish farm water, ensuring faster fish growth and lower energy usage. The dirty water from fish farm is converted into a resource for the industry too. The usage of new technology, sharing resources and infrastructure presents a novel opportunity to improve the environmental footprint of fishfarm and with decreased capital investments reduces production costs up to 20%. Sustainable fish can be farmed in a closed loop each year, with no nutrients released in nature.