1. Departamento de Zooloxía, Xenética e Antropoloxía Física, Facultade de Bioloxía; Universidade de Santiago de Compostela; Campus Vida s/n, 15782, Santiago de Compostela Spain
2. Hull International Fisheries Institute, School of Environmental Sciences; University of Hull; Hull, HU6 7RX UK
3. Scottish Centre for Ecology and the Natural Environment, Institute of Biodiversity; Animal Health and Comparative Medicine, University of Glasgow; Rowardennan, Glasgow, G63 0AW UK
4. Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics; UiT The Arctic University of Norway; N-9037, Tromsø Norway