In Mutriku, northern Spain, scientists from the AZTI research centre are working on a European project that aims to replace plastics used in aquaculture with something more environmentally friendly.
Local entrepreneur, Imanol Gurruchaga, runs an open-water mussel farm where mussels are grown on long ropes, suspended underwater. Mesh protects them from predators. The ropes and the mesh used are made of plastic. When they are no longer of use, they become a problem.