don't know much about the fish. but this is the only lake i could find that even talks about it.
http://www.env.gov.bc.ca/bcparks/explore/parkpgs/premier/Premier Lake
"REGION 4
Premier Lake - is one of a few easily accessible good fishing lakes in the East Kootenays and the renowned angling opportunities are the main attraction for visitors and one of the main reasons for its park designation. The emerald green lakes of Premier Lake and four smaller lakes, Canuck, Yankee, Cats Eye and Quartz offer a unique and varied fishing experience. Species found in Premier lake include Brook Trout, Bull Trout, Kokanee, Longnose Sucker, Northern Pikeminnow, Rainbow Trout, Redside Shiner, Steelhead, Tench, Westslope (Yellowstone) Cutthroat Trout and White Sucker. There is a boat launch located at the far end of the day use area.m As well, Staples Creek fish ladder and fish collection station provides eggs for the Kootenay Fish Hatchery and signs posted along Staples Creek interpret the life cycle of the rainbow trout. This site was used by the Ktunaxa (Kootenay) First Nations as a camp area and food fishery. "