1. Massachusetts Cooperative Fish and Wildlife Research Unit; Department of Environmental Conservation; University of Massachusetts; 160 Holdsworth Way Amherst Massachusetts 01003 USA
2. U.S. Geological Survey; Massachusetts Cooperative Fish and Wildlife Research Unit; Department of Environmental Conservation; University of Massachusetts; 160 Holdsworth Way Amherst Massachusetts 01003 USA
3. Department of Ecosystem and Conservation Science; University of Montana; 32 Campus Drive Missoula Montana 59812 USA
4. Massachusetts Division of Marine Fisheries; 30 Emerson Avenue Gloucester Massachusetts 01930 USA
5. Department of Environmental Conservation; University of Massachusetts; 160 Holdsworth Way Amherst Massachusetts 01003 USA