Jack W. Lentfer,¹ William A. Galster<sup>2,3

1</sup>Alaska Department of Fish and Game, Box 31-2000, Juneau, Alaska 99801, USA and Institute of Medical Biology and Department of Arctic Biology, University of Tromso, Box 635, 9001 Tromso, Norway Present addresses: 4350 Glacier Highway, Juneau, Alaska 9
²Institute of Arctic Biology, University of Alaska, Fairbanks, Alaska 99701, USA
³Department of Neurology, School of Medicine Medical Center, University of Utah, Salt Lake City, Utah 84132, USA