Mortalities in Trout Caused by Gear Type and Angler-Induced Stress

Abstract

Mortalities of hooked and released trout were measured at four Montana state hatcheries in 1978. At Yellowstone River Trout Hatchery, cutthroat trout (Salmo clarki) caught by single-barbless, single-barbed, and barbed treble hooks and landed rapidly showed no significant mortalities. At Washoe Park Trout Hatchery, Big Springs Trout Hatchery, and Bluewater Springs Trout Hatchery, rainbow trout (Salmo gairdneri) caught and returned to water of five different temperatures (47-61 F) showed mortalities that increased from 0 to 8.6% with increasing water temperatures. All fish in temperature-related tests were played to exhaustion before release.