1. National Institute of Aquatic Resources; Technical University of Denmark; Kavalergården 6 DK-2920 Charlottenlund Denmark
2. Centre for Environment, Fisheries and Aquaculture Science; Pakefield Road Lowestoft, Suffolk NR33 0HT U.K.
3. Marine Laboratory; Fisheries Research Services; 375 Victoria Road, 101 AB11 9DB Aberdeen U.K.
4. Havsmiljöinstitutet; Seminariegatan 1F 405 30 Göteborg Sweden
5. Institute of Marine Research; P. O. Box 1870 Nordnes N-5817 Bergen Norway
6. Faroe Marine Research Institute; Nóatún 3 100 Tórshavn Faroe Islands
7. Marine Research Institute; Skulagata 4 101 Reykjavik Iceland