Over the last four years IDREEM (Increasing Industrial Resource Efficiency in European Mariculture) has supported fish-farmers across Europe, in developing different systems to introduce Integrated Multi-trophic Aquaculture (IMTA) in their farming facilities. IMTA has the potential to deliver greater productivity and reduced environmental impact for the European aquaculture industry and this is the principal message of the FINAL REPORT of the project, that finished in September.