This project proposes to analyse the relationship between sockeye and pink salmon abundance and existing CPUE data from Canadian purse seine ITQ fisheries, years 2010-2014. This will entail: 1) obtaining catch data by set and location from individual purse seiners in Area 12 and comparing with indices of abundance by area. 2) Examining the special case situation in Area 29 where ITQ seiners have fished on delaying Fraser River sockeye (2010, 2014) and pink salmon (2013). 3) Exploring evidence for density dependence catchability in the ITQ fishery dynamics. 4) In consultation with PSC Staff, incorporate the above (if useful) within a Bayesian hierarchical methodology. 5) Review compliance with the requirements identified in the Kowal Letter to the Fraser River Panel (2002) and also with the Run-size estimation workshop (2003). And finally, 6) Develop a plan for additional sampling opportunities for the Panel’s consideration for implementation in future years.
S16-I19 Analysis of existing CPUE data from Canadian Commercial ITQ fisheries for the purpose of the possible integration of this information into run-size models for Fraser River sockeye and pink salmon
While Fraser River sockeye salmon survival has declined over the past decade, it has also exhibited high interannual variability. The processes responsible for this trend and the variability are not understood and require investigation. This project builds on the previous work by adding a fifth year of sampling juvenile migrants immediately prior to their entry into the Strait of Georgia (SoG). The sampling platform will be identical to that employed successfully in 2013-2015, and GSI analysis will help to provide estimates of relative abundance and migration timing past Mission by stock. It is anticipated that sampling intensity in 2016, a juvenile Pink Salmon outmigration year, will be similar to that in 2014. In 2016, we propose to repeat the 2014 & 2015 study design and parameters assessed, including the assessment of the nocturnal migration patterns of Sockeye juveniles for a third year.
As in previous years, samples collected under this project will be compared to samples collected in other ongoing and proposed assessments, such as DFO’s annual SoG trawl survey occurring June-July and a similar trawl survey in Johnstone Strait. In combination, these three studies will add a third year to a comprehensive multi-stock assessment of Fraser River juvenile sockeye salmon relative abundance and condition, from nursery lake exit through early marine near-shore residency.
Sub-yearling ocean-migrant sockeye salmon (e.g. Harrison River stock) can be important contributors to Fraser River Sockeye production. The 2016 survey will continue to incorporate the bio-sampling of captured sub-yearling juveniles to identify their contribution, and migration timing at Mission by Conservation Unit (CU).
Lastly, the 2016 project will explore the feasibility of deploying an acoustic Doppler current profiler in an attempt to measure water current velocities over a depth range. This information may be important in determining absolute juvenile sockeye abundance at Mission.
The purpose of this project is to improve assessment of summer chum salmon escapements in the northern boundary area of southern Southeast Alaska. The Alaska Department of Fish and Game currently maintains an escapement index of 13 summer-run chum salmon streams in the Boundary Area that are assessed primarily through aerial survey methods. Two additional index streams were identified during the first two years of this project, including one that was suitable for conducting long-term foot and aerial surveys. These streams were added to the Southern Southeast Subregion summer chum salmon escapement index during the Alaska Board of Fisheries meeting in February 2015. ADF&G Commercial Fisheries managers have expressed concern regarding their ability to obtain reliable counts of chum salmon in some of the large mainland rivers where chum salmon may be masked by high densities of pink salmon, particularly in years of low chum salmon abundance. The primary objective of this project is to conduct helicopter surveys of summer chum salmon on currently monitored, large mainland river systems south of Wrangell and one new index stream on Prince of Wales Island. Helicopter surveys will provide surveyors improved views of these streams, validate observations of chum and pink salmon abundance, identify primary chum salmon spawning areas, and improve managers’ ability to identify chum salmon during routine aerial surveys of other index streams in the area. Additional foot and aerial surveys conducted concurrently on three smaller chum salmon index systems will similarly allow for direct comparison to aerial survey estimates. Results from these surveys will guide future chum salmon monitoring in the boundary area. In addition, we will opportunistically collect tissue samples from pink and chum salmon for Southeast Alaska genetic baselines as needed.
N15-I24 Northern Boundary Area Summer Chum Salmon Monitoring 2015
N14-I39 Northern Boundary Area Summer Chum Salmon Monitoring 2014
N13-I09 Northern Boundary Area Summer Chum Salmon Monitoring 2013
N12-I11 Northern Boundary Area Summer Chum Salmon Monitoring
In the 2015 field season, the Pacific Salmon Commission’s Stock Monitoring Group leased an Adaptive Resolution Imaging Sonar (ARIS) system for counting fish passage and estimating behaviour and size distributions of salmon species at its hydroacoustic site on the Fraser River near Mission, B.C. The Southern Fund Committee (SFC) provided funding for this experiment, which demonstrated that the ARIS sonar was able to capture high-resolution images of fish targets allowing users to enumerate salmon passage and fish size at the site. As a new generation of imaging sonar, ARIS inherits many core technological features of the Dual-frequency identification sonar (DIDSON) while providing users with greatly enhanced and superior utilities for various needs, which will provide PSC with more accurate and precise estimates of near-shore salmon passage than the current split-beam system can ever achieve.
Sound Metrics Corporation (SMC), the parent sonar manufacturer of ARIS and DIDSON, has started to gradually phase out DIDSONs from the market. The imaging sonar systems are a very important component of the Mission hydroacosutics program, which have improved the accuracy of salmon-flux estimation in near-shore waters. Given the success of the 2015 pilot lease project noted above, the successful regional adoptions of ARIS for salmon enumeration in Alaska and Washington State, and PSC DIDSON units being beyond the manufacturer’s projected lifespan, we propose to modernize the Mission site and implement the ARIS imaging sonar into our daily estimation for the 2016 field program.
S16-I15 Assessment of Adaptive Resolution Imaging Sonar (ARIS) for Fish Counting in the Lower Fraser River