1. a U.S. Geological Survey , Leetown Science Center, S.O. Conte Anadromous Fish Research Center , Post Office Box 796, One Migratory Way, Turners Falls, Massachusetts , 01376 , USA
2. b Department of Natural Resources Conservation , University of Massachusetts , Amherst , Massachusetts , 01003 , USA
3. c U.S. Geological Survey, Leetown Science Center, S.O. Conte Anadromous Fish Research Center , Post Office Box 796, One Migratory Way, Turners Falls , Massachusetts , 01376 , USA
4. d University of California Cooperative Extension , 133 Aviation Boulevard, Suite 109, Santa Rosa , California , 95403 , USA