1. Hubbs-SeaWorld Research Institute, 2595 Ingraham St. San Diego, California 92109
2. Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, 2725 Montlake Boulevard E. Seattle, Washington 98112
3. University of Idaho, Department of Animal and Veterinary Science, 875 Perimeter Drive, Moscow, Idaho 83844