Northeastern Bering Sea Juvenile Chinook Salmon Survey, 2017 and Yukon River Adult Run Forecasts, 2018-2020

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ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (114 download)

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Book Synopsis Northeastern Bering Sea Juvenile Chinook Salmon Survey, 2017 and Yukon River Adult Run Forecasts, 2018-2020 by : Kathrine G. Howard

Download or read book Northeastern Bering Sea Juvenile Chinook Salmon Survey, 2017 and Yukon River Adult Run Forecasts, 2018-2020 written by Kathrine G. Howard and published by . This book was released on 2020 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monitoring of juvenile Yukon River Chinook salmon Oncorhynchus tshawytscha stocks rearing in the Northeastern Bering Sea (NBS) was initiated by the National Oceanic and Atmospheric Administration (NOAA) in 2002 using a pelagic trawl survey program. Juvenile salmon were caught after their first summer at sea, and prior work has demonstrated a clear relationship between juvenile abundance and future adult returns, enabling the use of juvenile data in adult run size forecasts. The estimated abundance of juvenile Chinook salmon in the NBS was approximately 2,480,000 (SD 439,000) in 2017, below the 2003-2016 average. The mean proportion of 2017 NBS juvenile Chinook salmon originating in the total Yukon River and Canadian-origin Yukon River was 72% (SD 5%) and 42% (SD 4%), respectively. Abundance of total Yukon and Canadian-origin stocks were estimated as 1,774,000 (SD 338,000) and 1,049,000 (SD 207,000), respectively. Previously established and new adult Yukon River run reconstructions were used to evaluate relationships between juvenile abundance and adult abundance of spawners, runs, and returns. A marked decrease in juvenile production (juveniles per spawner) for total Yukon River and Canadian-origin stocks was below their 2003-2016 averages. These data were incorporated into forecast models to predict total adult run size. Forecasted total Yukon River Chinook salmon run sizes for 2018-2020 were 179,000-301,000, 170,000-297,000 and 114,000-230,000, respectively; forecasted Canadian-origin Chinook salmon run sizes for 2018-2020 were 65,000-102,000, 74,000-116,000 and 62,000-105,000, respectively. The date-adjusted length (FL) of juvenile Chinook salmon in the NBS was 204 mm in 2017, below the 2003-2016 average of 212 mm. Marine data on juvenile Chinook salmon clearly demonstrate that Yukon River Chinook salmon should be expected to remain in a relatively low productivity regime in the near future, but record-low run abundance is unlikely through 2020.

Diet and Energy Density Assessment of Juvenile Chinook Salmon from the Northeastern Bering Sea Trawl Surveys, 2004–2017

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Total Pages : 27 pages
Book Rating : 4.:/5 (124 download)

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Book Synopsis Diet and Energy Density Assessment of Juvenile Chinook Salmon from the Northeastern Bering Sea Trawl Surveys, 2004–2017 by : Sabrina Garcia

Download or read book Diet and Energy Density Assessment of Juvenile Chinook Salmon from the Northeastern Bering Sea Trawl Surveys, 2004–2017 written by Sabrina Garcia and published by . This book was released on 2021 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The northeastern Bering Sea (NBS) is the rearing habitat for juvenile Norton Sound and Yukon River Chinook salmon (Oncorhynchus tshawytscha). In 2002, a marine survey was initiated by the National Oceanic and Atmospheric Administration to study the marine ecology of western Alaska Chinook salmon stocks. Information on the autumn diet (2004–2017) and energetic status (2006–2017) of juvenile Chinook salmon have been collected annually during these surveys to investigate how their feeding and condition respond to changes in the marine environment. During the years observed, juvenile Chinook salmon in the NBS primarily ate fish, including sand lance (Ammodytidae), capelin (Mallotus villosus), and other species, along with smaller proportions of decapods and other invertebrates. Annual average piscivory across all project years ranged from 69% to 96% by mass. Diet composition was size-dependent, and higher proportions of decapods and invertebrates were eaten by smaller juvenile Chinook salmon (

Bering Sea Chinook Salmon Bycatch Management, Regulatory Impact Review/initial Regulatory Flexibility Analysis

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ISBN 13 :
Total Pages : 842 pages
Book Rating : 4.3/5 (555 download)

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Book Synopsis Bering Sea Chinook Salmon Bycatch Management, Regulatory Impact Review/initial Regulatory Flexibility Analysis by :

Download or read book Bering Sea Chinook Salmon Bycatch Management, Regulatory Impact Review/initial Regulatory Flexibility Analysis written by and published by . This book was released on 2009 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Juvenile Chinook Salmon Abundance Index and Survey Feasibility Assessment in the Northern Bering Sea, 2014-2016

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ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Juvenile Chinook Salmon Abundance Index and Survey Feasibility Assessment in the Northern Bering Sea, 2014-2016 by : Kathrine G. Howard

Download or read book Juvenile Chinook Salmon Abundance Index and Survey Feasibility Assessment in the Northern Bering Sea, 2014-2016 written by Kathrine G. Howard and published by . This book was released on 2019 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-term monitoring of juvenile Chinook salmon Oncorhynchus tshawytscha is needed to identify recruitment and mortality processes, to understand early marine biology and ecology, and develop tools useful for fisheries management. A sampling program for Yukon River salmon was established in the northern Bering Sea in 2003 but annual sampling has been tenuous due to funding limitations. This project was designed to maintain the sampling program for Yukon River stocks, develop a genetic baseline to identify Yukon River stocks, and evaluate a lower cost survey alternative using a smaller vessel and trawl configuration. Results indicated that the genetic baseline can identify four groups of populations from Western Alaska, the two vessel/trawl configurations provided similar estimates of juvenile Chinook salmon abundance (within 20%); however, sea state limitations of the small vessel required an earlier survey timing (August rather than September). The change in survey timing contributed to differences in the spatial distribution and length of salmon caught during the 2 surveys. Surveys identified above average juvenile Chinook salmon abundance during 2014-2016 and above average juvenile abundance per spawner in 2014 and 2015. Both indicate an improvement to the recent poor production of Yukon River Chinook salmon, because juvenile abundance in the northern Bering Sea is known to be a leading indicator of adult returns for this stock. Sampling 2 different time periods provided additional insight into the early marine growth rates of juvenile Yukon River Chinook and other salmon species. Average Chinook salmon growth rate was 1.55 mm per day from marine entry to August, and 1.06 mm per day from August through September. This project represents a critical step to enable the long-term monitoring of juvenile Chinook salmon in Western Alaska and continued pursuit of factors that determine productivity and cohort strength of Yukon River Chinook salmon.

Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2018-2020

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)

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Book Synopsis Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2018-2020 by : Nathan Frost

Download or read book Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2018-2020 written by Nathan Frost and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This plan describes the coded-wire tagging of juvenile Chinook salmon Oncorhynchus tshawytscha on the Unuk River for the 2017 and 2018 brood years, which covers the coded-wire tagging of parr in fall of 2018 and 2019 and smolt in spring of 2019 and 2020, and sampling returning adults for age, sex, length, and coded-wire tags in escapement from the 2020 through 2025 return years. This study provides estimates of smolt and parr abundance, overwinter (freshwater) survival, mean lengths of juveniles, and harvest information of Chinook salmon originating from the Unuk River in Southeast Alaska. A separate project will be conducted on the Unuk River that employs aerial and foot survey peak counts to estimate large (>660 mm mid eye to fork of tail length) adult Chinook salmon returning to the river in 2018 and 2019. The primary goals of this and the companion study are to estimate inriver run size, total run size, marine harvest-exploitation rate and harvest distribution, smolt and parr abundance, marine survival (smolt to adult) and overwinter survival (parr to smolt). The Alaska Department of Fish and Game uses this information to make local and regional management decisions, and the Pacific Salmon Commission uses the data for coastwide management and stock assessment through the Chinook Technical Committee.

2019 Kuskokwim River Chinook Salmon Run Reconstruction and 2020 Forecast

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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.

2020 Kuskokwim River Chinook Salmon Run Reconstruction and 2021 Forecast

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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.

Juvenile Abundance and Harvest of Unuk River Chinook Salmon, 2022-2024

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

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Book Synopsis Juvenile Abundance and Harvest of Unuk River Chinook Salmon, 2022-2024 by : Nathan Frost

Download or read book Juvenile Abundance and Harvest of Unuk River Chinook Salmon, 2022-2024 written by Nathan Frost and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This plan describes the coded-wire-tagging of juvenile Chinook salmon Oncorhynchus tshawytscha on the Unuk River for the 2021 and 2022 brood years, which covers the coded-wire-tagging of parr in fall of 2022 and 2023 and smolt in spring of 2023 and 2024, and sampling returning adults for age, sex, length, and coded wire tags in escapement from the 2024 through 2029 return years. This study provides estimates of smolt and parr abundance, overwinter (freshwater) survival, mean lengths of juveniles, and harvest information of Chinook salmon originating from the Unuk River in Southeast Alaska. A separate project will be conducted on the Unuk River that employs aerial and foot survey peak counts to estimate large (≥ 660 mm mid eye to fork of tail length) adult Chinook salmon returning to the river in 2022 and 2023. The primary goals of this and the companion study are to estimate inriver run size, total run size, marine harvest and exploitation rates, harvest distribution, smolt and parr abundance, marine survival (smolt to adult) and overwinter survival (parr to smolt). The Alaska Department of Fish and Game uses this information to make local and regional management decisions and to evaluate the Unuk River Chinook salmon escapement goal, and the Pacific Salmon Commission uses the data for coastwide management and stock assessment through the Chinook Technical Committee.

Chinook Salmon Populations in Oregon Coastal River Basins

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ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Chinook Salmon Populations in Oregon Coastal River Basins by : J. W. Nicholas

Download or read book Chinook Salmon Populations in Oregon Coastal River Basins written by J. W. Nicholas and published by . This book was released on 1989 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2020-2022

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Book Synopsis Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2020-2022 by : Nathan Frost

Download or read book Operational Plan: Production and Harvest of Unuk River Chinook Salmon, 2020-2022 written by Nathan Frost and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This plan describes the coded-wire tagging of juvenile Chinook salmon Oncorhynchus tshawytscha on the Unuk River for the 2019 and 2020 brood years, which covers the coded-wire tagging of parr in fall of 2020 and 2021 and smolt in spring of 2021 and 2022, and sampling returning adults for age, sex, length, and coded-wire tags in escapement from the 2022 through 2027 return years. This study provides estimates of smolt and parr abundance, overwinter (freshwater) survival, mean lengths of juveniles, and harvest information of Chinook salmon originating from the Unuk River in Southeast Alaska. A separate project will be conducted on the Unuk River that employs aerial and foot survey peak counts to estimate large (≥660 mm mid eye to fork of tail length) adult Chinook salmon returning to the river in 2020 and 2021. The primary goals of this and the companion study are to estimate inriver run size, total run size, marine harvest-exploitation rate and harvest distribution, smolt and parr abundance, marine survival (smolt to adult) and overwinter survival (parr to smolt). The Alaska Department of Fish and Game uses this information to make local and regional management decisions, and the Pacific Salmon Commission uses the data for coastwide management and stock assessment through the Chinook Technical Committee.

Forecasting Stock-specific Upriver Migration Timing of Chinook Salmon in the Yukon River

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ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (965 download)

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Book Synopsis Forecasting Stock-specific Upriver Migration Timing of Chinook Salmon in the Yukon River by : Bryce Douglas Mecum

Download or read book Forecasting Stock-specific Upriver Migration Timing of Chinook Salmon in the Yukon River written by Bryce Douglas Mecum and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pacific salmon (Oncorhynchus spp.) are an economically and culturally important genus of fishes endemic to the North Pacific. Their sustainable management depends on an understanding of the drivers of their abundance and migration dynamics. In many instances, statistical models are employed to predict abundance and run timing before harvest takes place to more effectively meet management objectives. In this thesis, I created a general-purpose predictive model of run timing that can be applied to many salmon populations. I then applied it to Yukon River Chinook salmon (O. tshawytscha) by generating pre-season predictions of inriver run timing, which I then compared with existing observations of run timing at two upriver locations. Prediction errors were low enough for the model to be useful to management. Models such as the one created in this study represent an objective tool that can be used to reduce subjectivity in fisheries management.

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.

Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon

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ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (848 download)

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Book Synopsis Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon by : John E. Clark

Download or read book Estimation of the Annual In-river Run Strength of Yukon River Chinook Salmon Based Upon the Migratory Time Density Function, Effect of Commercial Catch and Effort on Test Fishery Catches, and Predicted Migratory Rates of Chinook Salmon written by John E. Clark and published by . This book was released on 1983 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Quantitatively contrast[s] test fishery catches on days of no commercial effort with test fishery catches during commercial openings"--P. 2.

Recent Developments in the Bering Sea Chinook Salmon Fishery

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ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (429 download)

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Book Synopsis Recent Developments in the Bering Sea Chinook Salmon Fishery by : Steven Pennoyer

Download or read book Recent Developments in the Bering Sea Chinook Salmon Fishery written by Steven Pennoyer and published by . This book was released on 1973 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Spatial Distribution, Diet, and Nutritional Status of Juvenile Chinook Salmon and Other Fishes in the Yukon River Estuary

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ISBN 13 :
Total Pages : 101 pages
Book Rating : 4.:/5 (962 download)

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Book Synopsis Spatial Distribution, Diet, and Nutritional Status of Juvenile Chinook Salmon and Other Fishes in the Yukon River Estuary by : Katharine Bollinger Miller

Download or read book Spatial Distribution, Diet, and Nutritional Status of Juvenile Chinook Salmon and Other Fishes in the Yukon River Estuary written by Katharine Bollinger Miller and published by . This book was released on 2016 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys were conducted in the Yukon River estuary during the summers of 2014 and 2015. The primary objectives of this research were to evaluate the community composition and spatial distribution of fish in the distributaries and within the river plume, and to investigate diets and energetic condition of emigrating juvenile Chinook salmon. A shallow, sub-ice platform separates the shoreline of the Yukon Delta plain from the marine environment. This platform extends up to 30 km offshore with water depths between 1 m and 3 m. At the seaward edge of this platform, the bathymetry increases sharply along an area known as the delta front which marks the transition between fresh and marine waters. Sampling for this research was conducted in the three main lower Yukon River distributaries and along the delta front. Sampling in the distributaries occurred from near ice-out in May through the end of July, while sampling along the front was conducted during cruises in June, July, and August of each year. Juvenile Chinook salmon utilized all three lower Yukon River distributaries for emigration; however, higher CPUE was observed at front stations along the north edge of the delta suggesting that the salmon move north after leaving the river mouths. Temporal differences in prey consumption and energy density of juvenile Chinook salmon were observed in both the distributaries and on the front. Juvenile Chinook salmon were a small component of the overall fish catch in each year. Most species captured in the distributaries were juvenile or young of the year (YOY). The most common species captured in the Yukon river distributaries in both sampling years were juvenile and YOY coregonids (whitefish and cisco), juvenile sheefish (Stenodus leucichthys), juvenile Arctic lamprey (Lethenteron camtschaticum), and juvenile burbot (Lota lota). The most common species on the delta front were Pacific rainbow smelt (Osmerus dentex), saffron cod (Eleginus gracilis), Pacific herring (Clupea pallasii), and ninespine stickleback (Pungitius pungitius). [doi:10.7289/V5/TM-AFSC-334 (http://dx.doi.org/10.7289/V5/TM-AFSC-334)]

Estimates of Total Abundance, Exploitation Rate, and Migratory Timing of Chinook Salmon Runs in the Yukon River, 1982-1986

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ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (235 download)

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Book Synopsis Estimates of Total Abundance, Exploitation Rate, and Migratory Timing of Chinook Salmon Runs in the Yukon River, 1982-1986 by : Linda K. Brannian

Download or read book Estimates of Total Abundance, Exploitation Rate, and Migratory Timing of Chinook Salmon Runs in the Yukon River, 1982-1986 written by Linda K. Brannian and published by . This book was released on 1990 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report on estimates of total abundance (total run size), exploitation rate (maximum sustainable exploitation rate), and migration timing (lower and middle runs, Alaska and upper runs, Canadian origin) of chinook salmon (Oncorhynchus tschawytscha Walbaum) in the Yukon river, Alaska between 1982 and 1986.

The Distribution and Abundance of Chinook Salmon (Oncorhynchus Tshawytscha) in the Upper Yukon River Basin as Determined by a Radio-tagging and Spaghetti Tagging Program, 1982-1983

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Publisher : New Westminster, B.C. : Fisheries and Oceans, Canada
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis The Distribution and Abundance of Chinook Salmon (Oncorhynchus Tshawytscha) in the Upper Yukon River Basin as Determined by a Radio-tagging and Spaghetti Tagging Program, 1982-1983 by : Canada. Department of Fisheries and Oceans. Pacific Region. Field Services Branch

Download or read book The Distribution and Abundance of Chinook Salmon (Oncorhynchus Tshawytscha) in the Upper Yukon River Basin as Determined by a Radio-tagging and Spaghetti Tagging Program, 1982-1983 written by Canada. Department of Fisheries and Oceans. Pacific Region. Field Services Branch and published by New Westminster, B.C. : Fisheries and Oceans, Canada. This book was released on 1985 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: