1. Department of Molecular Biology, University of Bergen Thormøhlensgt. 55, N-5020 Bergen, Norway
2. Institute of Marine Research PO Box 1870, Nordnes, N-5817 Bergen, Norway
3. National Institute of Nutrition and Seafood Research PO Box 2029, Nordnes, N-5817 Bergen, Norway
4. Institute of Aquaculture Research (AKVAFORSK) PO Box 5010, N-1432 Ås, Norway