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Author: Brian Bue
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 32
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Book Description
The goal of this project was to reconstruct the chum salmon Oncorhynchus keta run to the Kuskokwim River for the years 1976 to 2007 with sufficient accuracy and precision to allow for the estimation of productivity on a drainage-wide basis.
Author: Brian Bue
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 32
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Book Description
The goal of this project was to reconstruct the chum salmon Oncorhynchus keta run to the Kuskokwim River for the years 1976 to 2007 with sufficient accuracy and precision to allow for the estimation of productivity on a drainage-wide basis.
Author: Zachary W. Liller
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
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Book Description
Because it is not possible to count all chinook salmon that return to the Kuskokwim River, estimates of annual abundance and escapement are made using a maximum likelihood model. The model was used to estimate the 2015 drainage-wide runs size. This report discusses the model inputs, model results, uncertainty of the estimates, and conclusions of the reconstruction model.
Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
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.
Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 46
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Book Description
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.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309093007
Category : Science
Languages : en
Pages : 225
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Book Description
Recent declines in the abundance of salmon in the Arctic-Yukon-Kuskokwim (AYK) region of western Alaska have created hardships for the people and communities who depend on this resource. In 2002, the AYK Sustainable Salmon Initiative (SSI) was created to undertake research to understand the reasons for this decline and to help support sustainable management in the region. This report makes recommendations for developing the research that the AYK SSI science plan should be based on, and relates the development of a restoration plan to the results of that research.
Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 46
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Book Description
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.
Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 46
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Zachary W. Liller
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 152
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Book Description
The Kogrukluk River is located in the upper Holitna River basin, which is a major tributary of the Kuskokwim River, and produces chinook salmon Oncorhynchus tshawytscha, chum salmon O. keta, sockeye salmon O. nerka, and coho salmon O. kisutch that contribute to intensive subsistence and commercial salmon fisheries downstream. The Kogrukluk River weir is one of several projects operated in the Kuskokwim Area that form an integrated geographic array of escapement monitoring projects. Collectively, and in accordance with the State of Alaska's Policy for the Management of Sustainable Salmon Fisheries (5 AAC 39.222), this array of projects provides the means to assess escapement trends, which should be monitored consistently and considered in harvest management decisions. Towards this end, Kogrukluk River weir has been operated annually since 1976 to determine daily and total salmon escapements of returning salmon species; to estimate age, sex, and length compositions of Chinook, chum, and coho salmon escapement; to monitor environmental variables that influence salmon productivity; and to contribute to an integrated platform in support of other Kuskokwim Area fisheries projects. In 2006, a fixed-picket weir was operated on the Kogrukluk River from 29 June through 14 September, with a total of 13 inoperable days. In addition to enumerating escapement and estimating ASL composition, the weir served as a platform for several other projects including: Inriver Abundance of Chinook Salmon in the Kuskokwim River, Kuskokwim River Chinook Salmon Run Reconstruction, Kuskokwim River Sockeye Salmon Investigations, Kuskokwim River Salmon Mark-Recapture Project, and collection of pink salmon O. gorbuscha and Dolly Varden Salvelinus malma genetic tissue.
Author: Derick L. Williams
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 126
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Book Description
The Kogrukluk River produces Chinook salmon Oncorhynchus tshawytscha, chum salmon O. keta, sockeye salmon O. nerka, and coho salmon O. kisutch that contribute to intensive subsistence and commercial salmon fisheries downstream. Located in the upper Holitna River basin, which is a major tributary of the Kuskokwim River, the Kogrukluk River weir is one of several projects operated in the Kuskokwim Area that form an integrated geographic array of escapement monitoring projects. Collectively, and in accordance with the State of Alaska's Policy for the Management of Sustainable Salmon Fisheries (5 AAC 39.222), this array of projects provides the means to assess escapement trends that must be monitored and considered in harvest management decisions. Towards this end, the Kogrukluk River weir has been operated annually since 1976 to determine daily and total salmon escapements of returning salmon species; to estimate age, sex, and length compositions of Chinook, chum, and coho salmon escapement; to monitor environmental variables that influence salmon productivity; and to contribute to an integrated platform in support of other Kuskokwim Area fisheries projects. In 2007, a fixed-picket weir was operated on the Kogrukluk River from 26 June through 23 September, with a total of 24 inoperable days. In addition to enumerating escapement and estimating ASL composition, the weir served as a platform for other projects, including Kuskokwim River Chinook Salmon Run Reconstruction and Kuskokwim River Sockeye Salmon Investigations. Furthermore, the weir project served as a sampling location for the collection of pink salmon (O. gorbuscha) and Dolly Varden (Salvelinus malma) genetic tissue.
