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Report: Assessment of the contribution of off-channel habitat to the production of coho in the Englishman River

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The current program contributes to a series of studies that has assessed the overall coho smolt production in the Englishman River and quantified the portion originating in constructed and natural off-channel habitats. The 2010 program examined the proportion of smolts that derived from the Clay Young channel through a mark-recapture program, conducted between 12 April and 5 June

Author:  Taylor, J.A.; Wright, M.; J.A. Taylor and Associates Ltd. ;Fisheries and Oceans Canada

Date Published:  Oct 2010

Report ID:  23752

Audience:  Government and Public

Overall emigration from the Englishman system, during the study, was estimated to be 42,038 plus/or minus 8,350 smolts, of which 43% were contributed by the constructed channel. Failure to initiate sampling during the early portion of smolt migration resulted in underestimation of the size of the outmigration. Interpolation of this period, based on migration timing in the previous year, suggests that this likely represented at least 5% of the total production. A parametric bootstrap estimate indicated that the outmigration was larger (44,312) than estimated and showed that the confidence intervals were less precise (range 36,073 -62,994 smolts) than those based on the normal approximation. The large contribution to overall migration made by smolts from the Clay Young channel matched that found in 2009, which was the previous largest recorded proportion (41%) in any year of the program. This project was funded by the Oceans, Habitat and Enhancement Branch of Fisheries and Oceans Canada and the BC Living Rivers Program

Report Type
  Fish and Aquatic Habitat Information
  Fish Species - Coho Salmon - Oncorhynchus kisutch
  Region - Vancouver Island
  Fish and Fish Habitat - Stock Assessment
  Watershed Groups - 920 - Vancouver Island (East) Rivers

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