The project aims to develop and test biofilm-based Algal Turf Scrubber (ATS) technology for microalgal cultivation using wastewater from a recirculation aquaculture system (RAS) as growth medium. The project focuses on producing biomass with optimal fatty acid profile and content for use in e.g., sustainable aquafeed, while simultaneously reclaiming valuable nutrients and contributing to bioremediation. The ATS has a simple and scalable design to grow microalgae in biofilms, rather than suspension, simplifying the costly harvesting process. This approach has the potential to address key barriers in the European algal sector, such as high costs, energy demand, and low biomass yields. The project includes both laboratory and pilot-scale outdoor trials to evaluate the feasibility, scalability, costs, and requirements for large-scale integration at a RAS in regions with long winters and limited daylight hours.