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Steelhead smolt production capabilities were estimated for 17 Vancouver Island watersheds using two preliminary yield models developed from research conducted on Keogh River (Slaney MS 1981). Habitat measurements for the refined model were obtained from low elevation aerial photographs. Cost and benefits of aerial photographs relative to conventional ground surveys are discussed. The two smolt models predicted average smolt yield of 0.021 and 0.023 smolts/m2 for Vancouver Island streams. Steelhead survival rates, derived from the Keogh River (Ward and Slaney MS 1984) were applied to the smolt yield prediction to estimate average run size and escapement requirements for each stream. The accuracy of model predictions could not be determined in the absence of empirical measurements of smolt yield from a variety of streams. A general comparison was made, however, between predicted run size and angler catch (Steelhead Harvest Analysis 1971-86). These comparisons suggested that some streams including Little Qualicu
Lirette, M.G., Hooton, R.S.; Lewynsky, V.A.. 1987. Preliminary Steelhead Production Capability Estimates for Selected Vancouver Island Streams. Ministry of Environment and Parks. Fisheries Technical Circular. FTC74
Topic: Fish and Fish Habitats
Keywords: Vancouver Island, steelhead, production, smolt, yield, models, management
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