Gulkana River Chinook Salmon Escapement Estimation, 2022-2026

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Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Gulkana River Chinook Salmon Escapement Estimation, 2022-2026 by : Tracy R. Hansen

Download or read book Gulkana River Chinook Salmon Escapement Estimation, 2022-2026 written by Tracy R. Hansen and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives of this study are to estimate the spawning escapement and run timing of Chinook salmon Oncorhynchus tshawytscha in an index area of the Gulkana River using counting tower methodology. In addition, sockeye salmon O. nerka escapement at the tower site will be estimated during the period of tower operation. The number of Chinook salmon and sockeye salmon passing the tower site will be estimated by visually counting fish as they pass 2 counting towers located approximately 2.5 km upstream of the confluence of the West Fork. Ten-minute visual counts will be conducted for each river channel every hour, 24 hours per day, 7 days per week. The abundance estimates will be stratified by day. Because counts are planned for all hours, daily estimates of abundance will be a single-stage direct expansion from the 10 min counting periods. The count schedule will start prior to the beginning of the Chinook salmon run, approximately 3 June, and continue until after 10 August when the run is complete. Tower operations may be extended to a later date to enumerate more of the sockeye salmon run if funding is provided by Prince William Sound Aquaculture Corporation.

Gulkana River Chinook Salmon Distribution

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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (852 download)

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Book Synopsis Gulkana River Chinook Salmon Distribution by : Corey J. Schwanke

Download or read book Gulkana River Chinook Salmon Distribution written by Corey J. Schwanke and published by . This book was released on 2013 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study estimates the spawning distribution and run timing patterns of Chinook salmon in the Gulkana River and it also estimates proportions of Chinook salmon spawning above and below the counting tower. The study also discusses age, sex, and length (ASL) information collected from Chinook salmon. This information is used to characterize the composition of the Chinook salmon escapement and use that information in an age-structured model to evaluate the escapement goal and forecast returns.

Chinook Salmon Escapement and Run Timing in the Gulkana River, 2016-2018

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ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (114 download)

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Book Synopsis Chinook Salmon Escapement and Run Timing in the Gulkana River, 2016-2018 by : Corey J. Schwanke

Download or read book Chinook Salmon Escapement and Run Timing in the Gulkana River, 2016-2018 written by Corey J. Schwanke and published by . This book was released on 2019 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Counting tower techniques were used to estimate Chinook salmon Oncorhynchus tshawytscha escapement in the Gulkana River during 2016, 2017, and 2018. The counting tower was located in the mainstem Gulkana River about 3.25 rkm upstream of the West Fork Gulkana River confluence. The estimated escapement of Chinook salmon was 1,122 (SE = 166; 95% CI = 796-1,447) in 2016, 3,336 (SE = 309; 95% CI = 2,730-3,942) in 2017, and 5,174 (SE = 344; 95% CI = 4,499-5,848) in 2018. These numbers do not represent total inriver escapement, just passage above the counting tower site. The 2016 estimated escapement of Chinook salmon was the lowest since the inception of the project in 2002, whereas the 2018 estimated escapement was the 2nd highest on record and had the latest run timing. The dates of 25th, 50th, and 75th percentile passage of Chinook salmon have been getting later since the project's inception in 2002. The estimated escapement of sockeye salmon O. nerka during the counting tower's operational period was 26,010 (SE = 1,157; 95% CI = 23,743-28,277) in 2016, 20,492 (SE = 927; 95% CI = 18,675-22,309) in 2017, and 12,436 (SE = 540; 95% CI = 11,377-13,494) in 2018. The partial sockeye salmon escapement estimate in 2018 was the 2nd lowest since the inception of this project in 2002.

Chinook Salmon Escapement and Run Timing in the Gulkana River, 2019-2021

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Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)

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Book Synopsis Chinook Salmon Escapement and Run Timing in the Gulkana River, 2019-2021 by : Tracy R. Hansen

Download or read book Chinook Salmon Escapement and Run Timing in the Gulkana River, 2019-2021 written by Tracy R. Hansen and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Counting tower techniques were used to estimate Chinook salmon Oncorhynchus tshawytscha escapement in the Gulkana River during 2019, 2020, and 2021. The counting tower was located on the mainstem Gulkana River about 3.25 river kilometers upstream of the West Fork Gulkana River confluence. The estimated escapement of Chinook salmon was 8,400 (SE = 436; 95% CI = 7,546–9,254) in 2019, 2,504 (SE = 216; 95% CI = 2,080–2,928) in 2020, and 3,402 (SE = 273; 95% CI = 2,867–3,937) in 2021. These numbers do not represent total inriver escapement, just escapement above the counting tower site. The 2019 estimated escapement of Chinook salmon was the highest on record since the inception of the project in 2002, whereas the 2020 and 2021 estimated escapements were below the average for the years 2002–2018. The dates of the 25th, 50th, and 75th percentile of cumulative passage of Chinook salmon past the Gulkana River counting tower have been getting later since the project’s inception in 2002. The estimated escapement of sockeye salmon O. nerka during the counting tower’s operational period was 20,850 (SE = 661; 95% CI = 19,555–22,145) in 2019, 13,500 (SE = 574; 95% CI = 12,375–14,625) in 2020, and 13,924 (SE = 711; 95% CI = 12,531–15,317) in 2021. Counting tower operations were extended during 2019–2021 to enumerate more of the sockeye salmon return.

Chinook Salmon Escapement and Run Timing in the Gulkana River, 2013-2015

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ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Chinook Salmon Escapement and Run Timing in the Gulkana River, 2013-2015 by : Corey J. Schwanke

Download or read book Chinook Salmon Escapement and Run Timing in the Gulkana River, 2013-2015 written by Corey J. Schwanke and published by . This book was released on 2016 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Counting tower techniques were used to estimate Chinook salmon Oncorhynchus tshawytscha escapement at the Gulkana River for 2013, 2014 and 2015. The counting tower was located in the mainstem Gulkana River about 2.5 rkm upstream of the West Fork Gulkana River confluence. The counting tower was operational for all 3 years for the entire Chinook salmon run and a portion of the sockeye salmon O. nerka run. The estimated escapement of Chinook salmon was 3,936 (SE = 215; 95% CI = 3,515-4,357) in 2013, 3,478 (SE = 271; 95% CI = 2,947-4,009) in 2014, and 3,738 (SE = 251; 95% CI = 3,246-4,230) in 2015. These numbers do not represent total inriver escapement, just passage above the counting tower site. The date of 50th percentile passage of Chinook salmon varied from 14 July in 2013 to 5 July in 2015. The estimated escapement of sockeye salmon during the counting tower's operational period was 48,024 (SE = 1,834; 95% CI = 44,429-51,619) in 2013, 27,186 (SE = 1,236; 95% CI = 24,763-29,609) in 2014 and 24,624 (SE = 970; 95% CI = 22,723-26,525) in 2015.

Spawning Escapement of Chinook Salmon in the Stikine River, 2022–2024

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ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (132 download)

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Book Synopsis Spawning Escapement of Chinook Salmon in the Stikine River, 2022–2024 by : Kristin Courtney

Download or read book Spawning Escapement of Chinook Salmon in the Stikine River, 2022–2024 written by Kristin Courtney and published by . This book was released on 2022 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inriver abundance of large (fish =660 mm mid eye to tail fork [METF] length) Chinook salmon Oncorhynchus tshawytscha above the U.S./Canada border (border) will be estimated annually from 2022 to 2024 in the Stikine River, near Wrangell, Alaska. A modified Petersen 2-event mark–recapture project will be conducted using drift gillnets to mark large Chinook salmon in the first event, and collection of samples in the Canadian commercial fishery, Little Tahltan River video weir, and on the spawning grounds will serve as the second event. Additional project objectives are to a) estimate the annual spawning escapement of large Chinook salmon above the border, b) estimate the age, sex, and length composition of both the inriver run and spawning escapement, and c) estimate the proportion of large radiotagged Chinook salmon that cross the border. The Alaska Department of Fish and Game (ADF&G) and Fisheries and Oceans Canada (DFO) use these data to make terminal and regional management decisions, and the Pacific Salmon Commission (PSC) uses the data for coastwide management and stock assessment through the Chinook Technical Committee (CTC 2021).

2022 Kuskokwim River Chinook Salmon Run Reconstruction and 2023 Forecast

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)

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Book Synopsis 2022 Kuskokwim River Chinook Salmon Run Reconstruction and 2023 Forecast by : Sean D. Larson

Download or read book 2022 Kuskokwim River Chinook Salmon Run Reconstruction and 2023 Forecast written by Sean D. Larson and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A maximum likelihood model was used to estimate the 2022 drainagewide run size and escapement of Kuskokwim River Chinook salmon (Oncorhynchus tshawytscha). The total run was estimated to be 142,495 (95% CI: 107,579–188,743) fish, and escapement was estimated to be 107,980 (95% CI: 73,064–154,228) fish. Model estimates were informed by direct observations of the 2022 escapement at 3 weirs and 2022 harvest, combined with historical observations of escapement (up to 6 weirs and 14 aerial surveys), harvest, test fishery, and mark–recapture data dating back to 1976. Model results are adequate to draw broad conclusions about the 2022 run and escapement. The 2022 total run of Chinook salmon was below the 1976–2021 average of 211,081 fish. The drainagewide sustainable escapement goal of 65,000–120,000 was met in 2022. The 2022 Kuskokwim River Chinook salmon forecast is for a range of 115,000–170,000 fish.

Escapements of Chinook Salmon in Southeast Alaska and Transboundary Rivers in 2022

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Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Escapements of Chinook Salmon in Southeast Alaska and Transboundary Rivers in 2022 by : Philip Richards

Download or read book Escapements of Chinook Salmon in Southeast Alaska and Transboundary Rivers in 2022 written by Philip Richards and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimates of Chinook salmon Oncorhynchus tshawytscha spawning escapement in 2022 will be summarized for 11 Southeast Alaska river systems: Situk River, Alsek River, Chilkat River, Taku River, King Salmon River, Stikine River, Unuk River, Chickamin River, Blossom River, Keta River, and Andrew Creek. Spawning escapements will be estimated using aerial surveys, foot surveys, mark–recapture studies, and weirs. The Alaska Department of Fish and Game and Fisheries and Oceans Canada use these data, along with age composition data to make terminal and regional management decisions, and the Pacific Salmon Commission uses these data for coastwide management and stock assessment.

Creel and Escapement Estimates for Chinook Salmon on the Gulkana River, 1996

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ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (392 download)

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Book Synopsis Creel and Escapement Estimates for Chinook Salmon on the Gulkana River, 1996 by : Todd R. LaFlamme

Download or read book Creel and Escapement Estimates for Chinook Salmon on the Gulkana River, 1996 written by Todd R. LaFlamme and published by . This book was released on 1997 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Smolt Abundance and Adult Escapement of Chinook Salmon in the Taku River, 2022-2024

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Smolt Abundance and Adult Escapement of Chinook Salmon in the Taku River, 2022-2024 by : Jeffrey T. Williams

Download or read book Smolt Abundance and Adult Escapement of Chinook Salmon in the Taku River, 2022-2024 written by Jeffrey T. Williams and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon Oncorhynchus tshawytscha smolt abundance and adult escapement will be estimated for the Taku stock of Chinook salmon originating from the Canadian portions of the Taku River drainage above the U.S./Canada border. This large glacial river flows into Taku Inlet about 30 km northeast of Juneau, Alaska. A modified Petersen estimator will be used to estimate smolt abundance for the 2020-2022 brood years, which are the smolt leaving the system during 2022-2024. Chinook salmon smolt will be captured from April through June, systematically sampled to estimate mean length and weight, and all healthy fish will be implanted with a coded wire tag and marked with an adipose fin clip. Escapement of large (≥660 mm; mid eye to fork of tail) and medium (401-659 mm; mid eye to fork of tail) Taku River adult Chinook salmon in 2022-2024 will be estimated using mark-recapture methodology. Adult Chinook salmon will be captured and marked near Canyon Island in the lower Taku River using fish wheels and drift gillnets from late April through early August. Each healthy fish will be tagged with a uniquely numbered, solid-core spaghetti tag and two secondary marks will be applied. Fish will be sampled for data used in age, sex, and length composition estimates of the spawning escapement.

Gulkana River Chinook Salmon Spawning Distribution and Run Timing, 2013-2015

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ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (18 download)

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Book Synopsis Gulkana River Chinook Salmon Spawning Distribution and Run Timing, 2013-2015 by : Corey J. Schwanke

Download or read book Gulkana River Chinook Salmon Spawning Distribution and Run Timing, 2013-2015 written by Corey J. Schwanke and published by . This book was released on 2018 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were radiotagged near the confluence of the Gulkana and Copper rivers from 2013-2015 to determine run timing and spawning distribution in the Gulkana River. The main goal was estimating what proportion of the Chinook salmon escapement spawned above an ADF&G operated counting tower located approximately 79.5 rkm up the Gulkana River. Age, sex, and length composition of the escapement was also estimated. A total of 412 Chinook salmon were radiotagged from 2013?2015 using dip nets and hook and line as capture gear. The proportion of Chinook salmon that spawned above the ADF&G counting tower was 0.51 (SE = 0.072) in 2013, 0.45 (SE = 0.073) in 2014, and 0.54 (SE = 0.038) in 2015. Fish spawning above the ADF&G counting tower had a slightly earlier run timing than fish spawning below the counting tower with annual mean dates of passage past the lowest inriver tracking station being 0?7 days earlier. Further examining run timing by river reach, Chinook salmon that spawned in the tributaries and upper mainstem of the Gulkana River had earlier run timing than those spawning in the middle to lower mainstem. The estimated percentage of females that spawned above the counting tower varied by year. Females comprised an estimated 53% (SE = 6%) of the escapement in 2013, 29% (SE = 10%) in 2014, and 51% (SE = 4%) in 2015. Age-1.3 Chinook salmon was the most abundant age class, accounting for 81% (SE = 5%) of the estimated escapement in 2013, 48% (SE = 6%) in 2014, and 88% (SE = 3%) in 2015. Chinook salmon in the length class 751-850 mm mid eye to tail fork accounted for the majority of the estimated annual escapement, ranging between 46% (SE = 6%) and 63% (SE = 4%). This study found several positive relationships with fish traits (e.g., sex, length, and run timing) and spawning success specific to the Gulkana River. Male fish, longer fish, and fish with earlier run timings all had better chances of spawning during this study.

Chinook Salmon Escapement in the Gulkana River, 2010

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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (794 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2010 by : James William Savereide

Download or read book Chinook Salmon Escapement in the Gulkana River, 2010 written by James William Savereide and published by . This book was released on 2011 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports on the estimation of the escapement of Chinook salmon, Oncorhynchus tshawytscha, upstream of the West Fork Gulkana River through the use of a counting tower, which was in operation from May 31 through August 11, 2010.

2021 Kuskokwim River Chinook Salmon Run Reconstruction and 2022 Forecast

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ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (132 download)

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Book Synopsis 2021 Kuskokwim River Chinook Salmon Run Reconstruction and 2022 Forecast by : Sean D. Larson

Download or read book 2021 Kuskokwim River Chinook Salmon Run Reconstruction and 2022 Forecast written by Sean D. Larson and published by . This book was released on 2022 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: A maximum likelihood model was used to estimate the 2021 drainagewide run size and escapement of Kuskokwim River Chinook salmon (Oncorhynchus tshawytscha). The total run was estimated to be 129,751 (95% CI: 94,489–178,171) fish and escapement was estimated to be 101,000 (95% CI: 65,738–149,420) fish. Model estimates were informed by direct observations of the 2021 escapement at 3 weirs and 2021 harvest, combined with historical observations of escapement (up to 6 weirs and 14 aerial surveys), harvest, test fishery, and mark–recapture data dating back to 1976. Model results are adequate to draw broad conclusions about the 2021 run and escapement. The 2021 total run of Chinook salmon was below the 1976–2020 average of 214,475 fish. The drainagewide sustainable escapement goal of 65,000–120,000 was met in 2021. The 2022 Kuskokwim River Chinook salmon forecast is for a range of 99,000–161,000 fish.

Chilkat River Chinook Salmon Escapement Studies in 2022

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Chilkat River Chinook Salmon Escapement Studies in 2022 by : Brian W. Elliott

Download or read book Chilkat River Chinook Salmon Escapement Studies in 2022 written by Brian W. Elliott and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chilkat River large (age-1.3 and older) Chinook salmon Oncorhynchus tshawytscha inriver abundance and age and sex composition will be estimated using a 2-event mark–recapture experiment in 2022. Event 1 marking is conducted in the lower Chilkat River, and event 2 recapture is conducted in principal spawning areas within the Chilkat River drainage. Data produced from this project includes estimated spawning abundance and age, sex and length compositions of the large Chinook salmon run, and when possible, estimated spawning abundance and sex and length composition of the age-1.2 Chinook salmon run in the Chilkat River drainage. The Chilkat River stock of Chinook salmon is a Pacific Salmon Commission Chinook Technical Committee exploitation rate and escapement indicator stock, and contributes toward the coastwide Chinook model used by the Pacific Salmon Commission to monitor coastwide abundance. Mark–recapture experiments of adult Chinook salmon inriver abundance have been conducted in the Chilkat River drainage since 1991 and resulting escapement estimates have had an average coefficient of variation of 16%, which contributes toward precise stock assessment production estimates for the Chilkat River Chinook stock. As part of ongoing Chilkat River Chinook salmon coded wire tag studies, all Chinook salmon encountered in the mark–recapture experiment of adult Chinook salmon inriver abundance will be examined for missing adipose fins, an indication that fish may be tagged with a coded wire tag, information that leads to estimates of juvenile production and marine harvest. These data when used in conjunction with inriver abundance allows full production estimates for the Chilkat stock.

Chinook Salmon Escapement and Run Timing in the Gulkana River, 2011-2012

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ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (84 download)

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Book Synopsis Chinook Salmon Escapement and Run Timing in the Gulkana River, 2011-2012 by : Scott H. Maclean

Download or read book Chinook Salmon Escapement and Run Timing in the Gulkana River, 2011-2012 written by Scott H. Maclean and published by . This book was released on 2013 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Chinook Salmon Escapement in the Gulkana River, 2007-2008

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ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (435 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2007-2008 by : Linda J. Perry-Plake

Download or read book Chinook Salmon Escapement in the Gulkana River, 2007-2008 written by Linda J. Perry-Plake and published by . This book was released on 2009 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Chinook Salmon Escapement in the Gulkana River, 2009

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ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (768 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2009 by : Linda J. Perry-Plake

Download or read book Chinook Salmon Escapement in the Gulkana River, 2009 written by Linda J. Perry-Plake and published by . This book was released on 2011 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: