Author: Brian Daniel Taras
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 38

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Book Description

Author: Tracy R. Hansen
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0

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Book Description
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.

Author: Linda J. Perry-Plake
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 37

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Book Description

Author: Linda J. Perry-Plake
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 31

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Book Description

Author: James William Savereide
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 19

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Book Description

Author: Linda J. Perry-Plake
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 23

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Book Description

Author: Scott H. Maclean
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 29

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Book Description

Author: John Aram Der Hovanisian
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 42

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Book Description

Author: Corey J. Schwanke
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 32

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Book Description
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.

Author: Keith A. Pahlke
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 46

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Book Description