Chinook Salmon Escapement And Run Timing In The Gulkana River 2019 2021

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

Author : Tracy R. Hansen
Publisher :
ISBN 13 :
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, 2011-2012

Author : Scott H. Maclean
Publisher :
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 and Run Timing in the Gulkana River, 2016-2018

Author : Corey J. Schwanke
Publisher :
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, 2013-2015

Author : Corey J. Schwanke
Publisher :
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.

Gulkana River Chinook Salmon Escapement Estimation, 2022-2026

Author : Tracy R. Hansen
Publisher :
ISBN 13 :
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.

Run Timing and Spawning Distribution of Copper River Chinook Salmon, 2019-2021

Author : Corey J. Schwanke
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)

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Book Synopsis Run Timing and Spawning Distribution of Copper River Chinook Salmon, 2019-2021 by : Corey J. Schwanke

Download or read book Run Timing and Spawning Distribution of Copper River Chinook Salmon, 2019-2021 written by Corey J. Schwanke and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A total of 1,975 radio tags were placed in migrating Chinook salmon Oncorhynchus tshawytscha in the Copper River from 2019 through 2021 to examine spawning distribution and run timing. Chinook salmon were captured with fish wheels in the Lower Copper River near Baird Canyon and tracked to upriver destinations with 10 fixed-tracking stations and a series of aerial surveys. Spawning distribution was estimated for 6 major spawning tributaries/areas each year using a weighting process. Estimated annual proportions of the escapement ranged from 0.19 to 0.24 for the Upper Copper River area, 0.19–0.27 for the Gulkana River, 0.01–0.05 for the Tazlina River, 0.10–0.19 for the Tonsina River, 0.19–0.28 for the Chitina River, and was 0.14 all 3 years for the Klutina River. Estimated annual abundances for the 6 major spawning tributary/areas from 2019 through 2021 were 3,410–8,369 for the Upper Copper River area, 4,419–6,548 for the Gulkana River, 289–961 for the Tazlina River, 2,171–4,591 for the Tonsina River, 3,535–9,767 for the Chitina River, and 2,608–4,909 for the Klutina River. The annual estimated proportions of the total escapement that returned to 1 of the 9 original aerial index streams ranged from 0.39 to 0.47. The estimated annual proportion of the Gulkana River fish that spawned above the Alaska Department of Fish & Game (ADF&G) counting tower ranged from 0.58 to 0.68. Run timing patterns were similar during all 3 years with the Upper Copper River fish having the earliest run timings, followed by the Gulkana, Chitina, Tazlina, Tonsina, and Klutina Rivers. A secondary analysis was performed weighting each radiotagged fish using adaptive resolution imaging sonar (ARIS) estimates of “large” fish, which are all presumed to be Chinook salmon. These results are presented in this report as Appendix A.

Gulkana River Chinook Salmon Distribution

Author : Corey J. Schwanke
Publisher :
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.

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

Author : Corey J. Schwanke
Publisher :
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.

2020 Kuskokwim River Chinook Salmon Run Reconstruction and 2021 Forecast

Author : Sean D. Larson
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (124 download)

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Book Synopsis 2020 Kuskokwim River Chinook Salmon Run Reconstruction and 2021 Forecast by : Sean D. Larson

Download or read book 2020 Kuskokwim River Chinook Salmon Run Reconstruction and 2021 Forecast written by Sean D. Larson and published by . This book was released on 2021 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: A maximum likelihood model was used to estimate the 2020 drainagewide run size and escapement of Kuskokwim River Chinook salmon (Oncorhynchus tshawytscha). The total run was estimated to be 124,486 fish (95% CI: 102,661–150,952) and escapement was estimated to be 88,285 fish (95% CI: 66,460–114,751). Model estimates were informed by direct observations of the 2020 escapement at 15 locations (3 weirs and 12 aerial surveys) and 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 2020 run and escapement. The 2020 total run of Chinook salmon was below the 1976–2019 average of 215,870 fish. The drainagewide sustainable escapement goal of 65,000–120,000 was met in 2020. The 2021 Kuskokwim River Chinook salmon forecast is for a range of 94,000–155,000 fish.

2021 Kuskokwim River Chinook Salmon Run Reconstruction and 2022 Forecast

Author : Sean D. Larson
Publisher :
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.

Chinook Salmon Escapement in the Gulkana River, 2005-2006

Author : James William Savereide
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (652 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2005-2006 by : James William Savereide

Download or read book Chinook Salmon Escapement in the Gulkana River, 2005-2006 written by James William Savereide and published by . This book was released on 2010 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

2019 Kuskokwim River Chinook Salmon Run Reconstruction and 2020 Forecast

Author : Sean D. Larson
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis 2019 Kuskokwim River Chinook Salmon Run Reconstruction and 2020 Forecast by : Sean D. Larson

Download or read book 2019 Kuskokwim River Chinook Salmon Run Reconstruction and 2020 Forecast written by Sean D. Larson and published by . This book was released on 2020 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: A maximum likelihood model was used to estimate the 2019 drainagewide run size and escapement of Kuskokwim River Chinook salmon (Oncorhynchus tshawytscha). Total run and escapement were estimated to be 226,987 (95% CI: 182,811–281,839) and 188,483 (95% CI: 144,307–243,335) fish, respectively. Model estimates were informed by direct observations of the 2019 escapement at 16 locations (4 weirs and 12 aerial surveys) and 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 2019 run and escapement. The 2019 total run of Chinook salmon was the largest since 2007 and was probably above the 1976–2018 average of 215,529 fish. The drainagewide sustainable escapement goal of 65,000–120,000 was exceeded in 2019. The 2020 Kuskokwim River Chinook salmon forecast is for a range of 193,000–261,000 fish.

Chinook Salmon Escapement in the Gulkana River, 2009

Author : Linda J. Perry-Plake
Publisher :
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:

Chinook Salmon Escapement in the Gulkana River, 2007-2008

Author : Linda J. Perry-Plake
Publisher :
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, 2003-2004

Author : Linda J. Perry-Plake
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (212 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2003-2004 by : Linda J. Perry-Plake

Download or read book Chinook Salmon Escapement in the Gulkana River, 2003-2004 written by Linda J. Perry-Plake and published by . This book was released on 2007 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Chinook Salmon Escapement in the Gulkana River, 2002

Author : Brian Daniel Taras
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (584 download)

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Book Synopsis Chinook Salmon Escapement in the Gulkana River, 2002 by : Brian Daniel Taras

Download or read book Chinook Salmon Escapement in the Gulkana River, 2002 written by Brian Daniel Taras and published by . This book was released on 2005 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Chinook Salmon Escapement in the Gulkana River, 2010

Author : James William Savereide
Publisher :
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.