Coho salmon returning to the Taku River pass through an offshore troll fishery before entering inside waters where they encounter seine, drift gillnet, and recreational fisheries. After entering the river, the remaining coho salmon encounter drift/set gillnet fisheries in Canada. Such a resource is worthy of a stock assessment program that directly estimates production parameters such as harvest, escapement, exploitation rate, smolt production, survival rates and brood year production. This project will provide annual estimates of escapement necessary to refine escapement goals and forecast runs. Improved escapement goals and run forecasts along with inseason abundance estimates allow implementation of abundance-based management. These combined efforts in-river along with adult sampling programs in the various marine fisheries allow detailed stock assessment analyses.
Funding of this proposal will augment the existing joint Canada and US coded wire tagging programme and serve to provide the resources to meet the Stikine River chinook and coho salmon smolts tagging objectives. The data derived will be used to determine the distribution, run timing, marine survival, and magnitude of marine catches of adult Stikine River chinook salmon, and distribution and run timing adult Stikine River coho salmon. This project is directly linked to the requirement in Annex IV, Chapter 1, paragraph 3(a)(2&3) of the PST to develop and implement abundance-based management regimes for Stikine chinook and coho salmon.
N19-I18 Stikine River Coded Wire Tagging 2019 Report
N18-VHP04 Stikine Coded Wire Tagging Report 2018
N17-VHP09 Stikine River Coded Wire Tagging Augmentation 2017. Year 10
N16-I03 Stikine River Coded Wire Tag Augmentation 2016. Year 9
N15-I03 Stikine River Coded Wire Tag Augmentation, 2015. Year 8
N14-I03 Stikine River Coded Wire Tag Augmentation, 2014. Year 7
N13-I03 Stikine River Coded Wire Tag Augmentation, 2013. Year 6
N12-I03 Stikine River CWT Augmentation, 2012
N11-I07 Stikine River CWT Augmentation 2011
N10-I05 Stikine River CWT Augmentation 2010
N08-I37 Stikine River CWT Augmentation 2008
N07-I15 Stikine River CWT Augmentation 2007
N06-I16 Stikine River CWT Augmentation 2006
Hydroacoustic programs have been conducted on the Fraser River at Mission, B.C. by the International Pacific Salmon Fisheries Commission (1977-1985) and the Pacific Salmon Commission (PSC; 1986 to the present) to estimate gross upstream passage of Fraser River sockeye salmon. The estimates of daily salmon passage provided by the hydroacoustics program, combined with information from test fishery, stock identification, and catch monitoring programs are used in models to provide estimates of stock abundance, timing, and escapement that are vital to the in-season management of Fraser River Sockeye Salmon.
Following years of discrepancies between the Mission and spawning ground estimates investigations have been undertaken to determine the causes of the discrepancies between these two estimates. As part of the investigations into these discepancies DFO conducted a 5-year experimental program from 1993-1998 at Qualark Creek to design, test and perfect specialized in-river equipment and analytical protocols for riverine acoustic measurements. When Qualark was in monitoring mode in the 1990’s, the pattern of upstream passage tended to track that at Mission, but occasionally showed noticeable differences.
DFO reactivated the Qualark Hydroacoustic Site in 2008 to test the feasibility of the site for estimating salmon abundance with dual-frequency imaging sonar (DIDSON). The daily salmon flux has been estimated in-season using a DIDSON system on each bank of the river between 2008 and 2016. Assessing the performance of the Qualark program through these operational years, DFO has concluded that the site at Qualark is an excellent location for acoustic enumeration of salmon flux in the Fraser River. The site has the ideal characteristics for detecting and tracking Sockeye Salmon as they move upstream, and produces reliable in-season estimates of salmon flux.
Qualark’s sampling system includes 2 DIDSON acoustic units, deployed one on each bank of the Fraser River and operated 24 hours per day during the period of Sockeye Salmon migration. The sampling system also includes integration of catch data from the the daily test fishing operation conducted at the Qualark site on the Fraser River by the Yale First Nation. Daily salmon migration flux is derived by simple time expansion of sub-sampled salmon flux over 3 acoustic data range bins.
S17-I28 Qualark 2017 Summary Report
S16-I18A Qualark Acoustics: Estimating Daily Salmon Passage in the Fraser River Near Yale, BC Report 2016. Year 5
S15-I04A Qualark Acoustics: estimating daily salmon passage in the Fraser River near Yale, BC in 2015. Year 4
S14-I09A Qualark Acoustics: Estimating Daily Salmon Passage in the Fraser River Near Yale, BC. 2014. Year 2
S13-I15A Qualark Acoustics: Estimating Daily Salmon Passage in the Fraser River Near Yale, BC. 2013
The primary goals of the Chilko River Chinook Salmon Mark-Recapture Project are to develop and estimate the spawning abundance that meets or exceeds the Chinook Technical Committee data standard for escapement indicator stocks. Specifically to determine:
1) estimates of spawning escapement by age and sex that will, on average, attain a coefficient of variation (CV) of 15% or less on the spawner estimates; and
2) consistent estimates that are asymptotically unbiased.
Additional objectives include bias testing of application and recovery data, and improving the efficiency of the study in-season and annually.