In this report, major life stages of the Gerrard rainbow trout are considered progressively. Gerrard spawners take an average of 14 nights to migrate the 65 km from Kootenay to Trout Lake. The recent construction of the Duncan Dam has reduced the flow of the lower Duncan River during the upstream migratory period, but no changes in timing, duration or intensity of spawning runs are attributed to the dam. Spawning population estimates suggest a decline in numbers since the early 1900s, but no strong correlation between numbers of spawners and fishing intensity in Kootenay Lake is apparent. Trout spawn only in a restricted portion of the upper Lardeau River (Gerrard), an area of warm, clear water and stable velocity. Relatively large gravel and fast water in the spawning area may, in conjunction with aggressive behaviour exhibited by spawning males, select for large individuals. The mean age of spawners is 5-6 years, and the average length, 80 cm. Gerrard females produce an average of 8000 eggs. Nest super-impo
Irvine, James R.. 1978. The Gerrard Rainbow Trout of Kootenay Lake - British Columbia - A Discussion of Their Life History with Management - Research and Enhancement Recommendations. Ministry of Environment. Fisheries Management Report. FMR72
Topic: Fish and Fish Habitats
Keywords: rainbow trout, Gerrard, Lardeau River, Duncan Dam, migration, kokanee salmon, food, movements, population trends, habitat, spawning, mortality, Tout Lake, Kootenay Lake, research, enhancement
Scientific Name: Oncorhynchus mykiss
English Name: Rainbow Trout
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