2017 Fraser Sockeye Estimation Plan
The Fraser River Sockeye Stock Assessment Program has a mandate to provide reliable escapement estimates for all Fraser River Sockeye populations. Individual populations are assessed using standard enumeration methodology which is based on the number of spawners expected to return by population. High precision techniques such as enumeration fences, Sonar (DIDSON or ARIS) or mark-recapture studies are used for stocks with expected escapements of 75,000+ (the actual technique is based on local characteristics), and visual surveys are used for stocks with expected escapements of less than 75,000. The 2017 plan is as follows1:
Mark-Recapture Studies: Mark-recapture studies are
planned for Harrison and Tachie rivers (Summer Runs) and Adams River
- Enumeration Fences: Fences are planned for Scotch Creek (Early Summer Run) and Cultus Lake (Late Run).
- Sonar: DIDSON and/or ARIS projects are planned for Chilko, Stellako and Quesnel rivers (Summer Run) and Birkenhead River (Late Run).
- Visual Surveys: Cyclic visual surveys by foot, boat or helicopter are planned for all remaining Fraser sockeye populations.
1 Actual project profile is pending final budget allocations and Sockeye abundance.
2017 FRASER SOCKEYE ESCAPEMENT REPORTING
Preliminary estimates are based on data that have been entered into the computer database at the completion of the field project. Data accuracy has not been verified and bias tests have not been performed (mark-recapture projects). Significant changes in preliminary estimates are possible. The anticipated release schedule for Preliminary estimates is: Early Run (Stuart) in late October; Early Summer Run in late November; Summer Run in late December; and Late Run in late January.
Near Final estimates are based on data that have been verified for accuracy, tested for bias and corrected for age composition (adults vs. jacks). Changes in near final estimates are unlikely. Near Final estimates will be available for all run groups in March 2018.
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