1. Institute of Marine Research, PO Box 1870, Nordnes, 5817 Bergen, Norway
2. National Institute of Water and Atmospheric Research (NIWA), 217 Akersten Street, Port Nelson, Nelson 7010, New Zealand
3. Department of Biological Sciences, University of Bergen, PO Box 7800, 5020 Bergen, Norway
4. Centre for Environment, Fisheries and Aquaculture Science (Cefas), Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK
5. Department of Zoology, Division of Population Genetics, Stockholm University, 10691 Stockholm, Sweden
6. Institute of Marine Research, Framsenteret, 9296 Tromsø, Norway