1. National Marine Fisheries Service; Northeast Fisheries Science Center, 166 Water Street; Woods Hole MA 02543 U.S.A.
2. Living Marine Resources Cooperative Science Center, Department of Natural Sciences; University of Maryland Eastern Shore; Princess Anne MD 21853 U.S.A.
3. National Marine Fisheries Service; Northeast Fisheries Science Center; Oceanography Branch Narragansett RI 02882 U.S.A.