1AKVAFORSK (Institute of Aquaculture Research A.S.), Sunndalsøra N-6600, Norway
2Northwest Fisheries Science Center, NOAA/NMFS, 2725 Montlake Boulevard E., Seattle, WA 98112, USA
3BioMar, Myre N-8430, Norway
4Amycor, Amylum Group, Burchstraat 10, Aalst B-9300, Belgium