2022 Kuskokwim River Chinook Salmon Run Reconstruction and 2023 Forecast PDF Download

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: Kristin Courtney
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 0

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Book Description
The 2022 forecast of Stikine River sockeye salmon, Oncorhynchus nerka, run abundance is poor and we anticipate very little harvest opportunity for either U.S. or Canadian fisheries. Since 1994, we have almost exclusively relied on the Canadian lower river commercial fishery to provide the stock-specific information that is used to complete the mixed stock run reconstruction for Stikine River sockeye salmon. It is highly likely there will be little commercial fishing opportunity in 2022 to gather this pertinent information. To obtain stock composition data necessary to estimate the inriver abundance, we will continue to conduct a sockeye salmon stock assessment program at Kakwan Point that began in 2021. The project will be conducted in conjunction with the existing Stikine River Chinook salmon, O. tshwaytscha, stock assessment program, and will extend the project through the end of the sockeye salmon run in mid-August. Tissue samples will be collected from sockeye salmon for genetic mixed stock analysis and for use in a genetic mark–recapture study to estimate inriver abundance based on an expansion of the Tahltan stock that is monitored via weir. We will also gather daily CPUE information, capture and spaghetti tag sockeye salmon, and estimate the age, sex, and length composition for sockeye salmon captured at Kakwan Point.

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: 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: Kenneth Roberson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 142

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Book Description
Describes Copper River (Alaska) sockeye and chinook salmon forecasting techniques, including confidence interval determination. Also addressed are corresponding run timing prediction for commercial catch, and total salmon escapement timing for the Miles Lake sonar enumeration site.

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309053455
Category : Science
Languages : en
Pages : 317

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Book Description
The Bering Sea, which lies between the United States and Russia, is one of the most productive ecosystems in the world and has prolific fishing grounds. Yet there have been significant unexplained population fluctuations in marine mammals and birds in the region. The book examines the Bering Sea ecosystem's dynamics and the relationship between man and the ecosystem, in order to identify potential reasons for the population fluctuations as well as identify ways the Sea's living resources can be better managed by government.

Author: Michael Fitz
Publisher: The Countryman Press
ISBN: 168268511X
Category : Nature
Languages : en
Pages : 279

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Book Description
A natural history and celebration of the famous bears and salmon of Brooks River. On the Alaska Peninsula, where exceptional landscapes are commonplace, a small river attracts attention far beyond its scale. Each year, from summer to early fall, brown bears and salmon gather at Brooks River to create one of North America’s greatest wildlife spectacles. As the salmon leap from the cascade, dozens of bears are there to catch them (with as many as forty-three bears sighted in a single day), and thousands of people come to watch in person or on the National Park Service’s popular Brooks Falls Bearcam. The Bears of Brooks Falls tells the story of this region and the bears that made it famous in three parts. The first forms an ecological history of the region, from its dormancy 30,000 years ago to the volcanic events that transformed it into the Valley of Ten Thousand Smokes. The central and longest section is a deep dive into the lives of the wildlife along the Brooks River, especially the bears and salmon. Readers will learn about the bears’ winter hibernation, mating season, hunting rituals, migration patterns, and their relationship with Alaska’s changing environment. Finally, the book explores the human impact, both positive and negative, on this special region and its wild population.

Author: Rocky Barker
Publisher: Island Press
ISBN: 1597268771
Category : Nature
Languages : en
Pages : 283

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Book Description
Saving All the Parts is a journalist's exploration of the intertwining of endangered species protection and the economic future of resource dependent communities -- those with local economies based on fishing, logging, ranching, mining, and other resource intensive industries. Rocky Barker presents an insightful overview of current endangered species controversies and a comprehensive look at the wide-ranging implications of human activities. The book analyzes trends in natural resource management, land use planning, and economic development that can lead to a future where economic activity can be sustained without the loss of essential natural values. Throughout, Barker provides a thorough and balanced analysis of both the ecological and economic forces that affect the lives and livelihoods of the nation's inhabitants -- both human and animal.

Author: Thomas P. Quinn
Publisher: UBC Press
ISBN: 0774842431
Category : Nature
Languages : en
Pages : 392

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Book Description
The Behavior and Ecology of Pacific Salmon and Trout explains the patterns of mate choice, the competition for nest sites, and the fate of the salmon after their death. It describes the lives of offspring during the months they spend incubating in gravel, growing in fresh water, and migrating out to sea to mature. This thorough, up-to-date survey should be on the shelf of everyone with a professional or personal interest in Pacific salmon and trout. Written in a technically accurate but engaging style, it will appeal to a wide range of readers, including students, anglers, biologists, conservationists, legislators, and armchair naturalists.