Kanchana Bandara, Akvaplan niva, Tromso, Norway, Michael Bedington, Akvaplan-niva, Tromsø, Norway, Camila Serra Pompei, Technical University of Denmark, DTU Aqua, Kgs Lyngby, Denmark, Philip Wallhead, LEGOS, 31401 Toulouse, France, Marta Moyano, Norwegian Institute for Water Research, Institute for Hydrobiology and Fisheries Science, Oslo, Norway, Øystein Varpe, University of Bergen, Department of Biological Sciences, Bergen, Norway and Claudia Halsband SR, Akvaplan niva AS, Ecosystems, Tromsø, Norway