The mysteries of the bull trout, recently listed as threatened on the Blackfoot River, will be revealed Nov. 16-17 at a Bull Trout Workshop hosted by the American Fisheries Society's North Pacific-International Chapter. To be held in Nelson, B.C., a three-hour drive due north from Spokane, Wash., the symposium will explore recovery and management techniques. Contact Tim Slaney at 604/266-1113 or e-mail: 76043.2377@compuserve.com.