1. National Marine Fisheries Service, Southeast Fisheries Science Center 101 Pivers Island Road Beaufort North Carolina 28516 USA
2. Virginia Institute of Marine Science, College of William & Mary Post Office Box 1346 Gloucester Point Virginia 23062 USA
3. Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Post Office Box 38 Solomons Maryland 20688 USA
4. National Marine Fisheries Service, Southeast Fisheries Science Center 3500 Delwood Beach Road Panama City Florida 32408 USA