1. Department of Chemistry and Bioscience-Food Science, Chalmers University of Technology, Box 5401, S-402 29 Göteborg, Sweden; Laboratory of Aquatic Food Biomolecular Research, Aquatic Food Products Program, Department of Food Science and Human Nutrition, University of Florida, Gainesville, Florida 32611; and Massachusetts Agricultural Experiment Station, DFS, University of Massachusetts/Amherst Marine Station, P.O. Box 7128, Gloucester, Massachusetts 01930