1. University of Texas at Austin, Marine Science Institute; Austin TX 78373 U.S.A.
2. Norwegian Institute of Water Research; P. O. Box 6215 N-7486 Trondheim Norway
3. Nofima; P. O. Box 5010 1430 As Norway
4. Rosenstiel School of Marine Science; University of Miami; Miami FL 33149 U.S.A.