Affiliation: | (1) U.S. Fish and Wildlife Service, Oregon Cooperative Fishery Research Unit, Oregon State University, Corvallis, OR, 97331, U.S.A.;(2) Oregon Cooperative Fishery Research Unit, Oregon State University, Corvallis, OR, 97331, U.S.A.;(3) Present address: Marine Science Institute, University of Texas, Port Aransas, Texas, 78784, U.S.A. |