Lake trout (Salvelinus namaycush) are an important indicator of the health of aquatic ecosystems and are a valued resource for harvest by First Nations and for sport fishing by visitors. Parks Canada monitors lake trout using the Summer Profundal Index Netting (SPIN) method. Area weighted average catch per unit effort of lake trout is monitored for 3 key lakes (Kathleen, Mush and Bates) in Kluane National Park and Reserve using gillnets of varying mesh size. Nets are set for 2 hours at various depths and locations in the lakes. Sampling occurs during August every 5 years.