1. Norwegian Institute for Agricultural and Environmental Research, Bioforsk Nord Holt, P.O. Box 2284, N-9269 Tromsø, Norway
2. Department
of Biology, University of Tromsø (UiT), N-9037 Tromsø, Norway
3. Nofima-Norwegian Institute of Food, Fisheries and Aquaculture Research, Osloveien 1, N-1430 Ås, Norway