The Idaho Department of Fish and Game, in collaboration with Nez Perce Tribal Fisheries Research Division, has been tracking steelhead bound for the South Fork Clearwater River since September with the primary objective of trying to better understand how steelhead move and use the river system and what causes them to move. It is especially important to learn how wild steelhead move through the river differently than the hatchery fish.
LINK (via:The Fish Ladder)