1The Institute of Ruder Boskovic, Centre for Marine Research, Zagreb Laboratory for Aquaculture, Bijenicka 54, 4100 Zagreb, Croatia
2Fisheries and Oceans Canada, West Vancouver Laboratory, 4160 Marine Drive, West Vancouver, B. C., V7V 1N6 Canada
3Northwest Fisheries Science Center, 2725 Montlake Boulevard East, Seattle, WA 98112, USA
4Department of Animal Science, University of British Columbia, 248 — 2357 Main Mall, MacMillan Building, Vancouver, B.C., V6T 2A2 Canada
5Alko Ltd., Process and Product Development, SF 05200, Rajamáki, Finland