1. University of Brest, Ifremer, CNRS, UMR, Amure, Unité d’Economie Maritime, IUEM, Plouzané, France
2. Ifremer, Univ Brest, CNRS, UMR, Amure, Unité d’Economie Maritime, IUEM, Plouzané, France
3. Department of Agricultural Economics, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
4. The Flanders Research Institute for Agriculture, fisheries and food (ILVO), Ostend, Belgium