Population Dynamics and Trophic Ecology of Nonnative Lake Trout in Priest Lake, Idaho

Nonnative Lake Trout have provided a recreational fishery in Priest Lake, Idaho, since their introduction in 1925. However, changes in the fish assemblage, declines in Lake Trout body condition, and negative interactions between Lake Trout and fishes of conservation and economic importance have prompted questions about future management goals for this Lake Trout population. Given the lack of fishery-independent information, I evaluated the demographics and trophic ecology of Lake Trout in Priest Lake. I used age-structured population models to synthesize biological information and evaluate the feasibility and trade-offs associated with eradication, trophy, and balance management scenarios. I also used stable isotope analysis to evaluate Lake Trout in a food-web context. These studies contribute directly to effective management of Lake Trout in Priest Lake, and more broadly, to our understanding of Lake Trout populations throughout North America.Thesis (M.S., Natural Resources) -- University of Idaho, 201