1. Professional Researcher, Marine Sciences Institute, Univ. of California, Santa Barbara, CA 93106 (corresponding author).
2. Senior Advisor, SINTEF Fisheries and Aquaculture, NO-7465 Trondheim, Norway.
3. Research Manager, SINTEF Fisheries and Aquaculture, NO-7465 Trondheim, Norway.
4. Senior Research Scientist, SINTEF Fisheries and Aquaculture, NO-7465 Trondheim, Norway.