1. Danish Institute for Fisheries Research, Department of Seafood Reseach, Technical University of Denmark, Søltofts Plads, Building 221, DK-2800 Kgs. Lyngby, Denmark, MATFORSK, Osloveien 1, N-1438 Aas, Denmark, and Department of Dairy and Food Science, Food Technology, The Royal Veterinary and Agricultural University, Rolighedsved 30, DK-1958 Frederiksberg C, Denmark