1. Department of Biological Sciences, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60608, U.S.A.
2. Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, Florida 33149, U.S.A.
3. Tuna Research and Conservation Center, Monterey Bay Aquarium, 886 Cannery Row, Monterey, California 93940, U.S.A.