1. Thünen-Institute of Baltic Sea Fisheries (Thünen-OF), Rostock, Germany;
2. Institute of Marine Research, Bergen, Norway;
3. Centre for Environment, Fisheries & Aquaculture Science, Lowestoft, UK;
4. School of Environmental Sciences, University of East Anglia, Norwich, UK;
5. AZTI-Tecnalia, Sukarrieta, Spain