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An unfished (no-kill fishery) population of juvenile steelhead (rainbow) trout in the mainstem Coquihalla River was studied in late August 1977. Population size, growth rate, biomass and habitat segregation were investigated. Biophysical reconnaissance involved ground truthing of air photographs for stream gradient analysis. The Coquihalla River exhibits a wide diversity of fish habitat but lacks sufficient low gradient habitat for younger juvenile rearing and has limited spawning area. The mean biomass density of age (2+) or younger trout was 2.3 g/m2. The distribution of biomass is unbalanced towards (2+) and older fish. Growth of trout in the Coquihalla River is reasonably good compared to other similar streams in the south coast of BC. Benthic production is presumed to be good with a wide diversity of species observed. The Coquihalla River is not an ideal nursery stream and this is reflected in estimates of smolt yield. Limited suitable habitat for age (+) or (1+) fish is judged to be one of the primary l
Ptolemy, R.A.. 1978. Habitat Segregation and Standing Crop of Steelhead Trout Juveniles (Salmo gairdneri richardson) in the Coquihalla River Mainstem Above Othello British Columbia 1977. Ministry of Recreation and Conservation. Fisheries Report. FRN80
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