1. National Institute of Aquatic Resources; Technical University of Denmark; North Sea Science Park; PO Box 101 DK-9850 Hirtshals Denmark
2. National Institute of Aquatic Resources; Technical University of Denmark; Charlottenlund Slot - Jaegersborg Allé 1 DK-2920 Charlottenlund Denmark
3. Department of Aquatic Resources; Institute of Marine Research; Swedish University of Agricultural Sciences (SLU); Lysekil Sweden