Both fish farms and wild capture fisheries understand the importance of sustainable production, but will it ever be possible to have a fully circular system where we use 100% of the fish we catch or farm? Thor Sigfusson (Founder and Chairman of Iceland Ocean Cluster) and Emil Linfors (Aquaculture Innovation Researcher at the University of Norway) highlight the issue of waste in aquaculture and provide insight into how we could fix our production methods to utilise all of our unwanted fish.