Assessment of the Hatchery and Wild Components of the Willow and Deception Creek Chinook Salmon Escapement 2013-2015 PDF Download

Author: Samantha Oslund
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 26

View

Book Description

Author: Scott Kent
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 17

View

Book Description
Declining run sizes and ensuing state and federal restrictions and closures to Unalakleet River Chinook salmon Oncorhynchus tshawytscha fisheries highlighted the need to obtain more complete estimates of spawning escapement. In response, multiple agencies and entities began the Unalakleet River weir project in 2010 funded by United States Fish and Wildlife Service's Office of Subsistence Management to obtain estimates of the mainstem Chinook salmon escapement and its age, sex, and length composition. An estimated 667 and 1,126 Chinook salmon were enumerated during the 2013 and 2014 seasons. The central 50% of the Chinook salmon run was enumerated 7 July-18 July in 2013 and could not be determined in 2014 because Chinook salmon passage was not fully evaluated. In 2013, there were 3 days of partial counts. Interpolation of missed counts could not be completed in 2014 because of incomplete information about the exact duration and extent of unmonitored periods. Age composition could not be determined from the 2013 escapement samples because the minimum sampling goal was not achieved; sex composition was 52% female. In 2014, age-1.3 Chinook salmon comprised the majority (68%) of the escapement samples.

Author:
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 144

View

Book Description

Author: Jenefer Bell
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 13

View

Book Description
Declining run sizes and ensuing state and federal restrictions and closures to Unalakleet River Chinook salmon Oncorhynchus tshawytscha fisheries highlighted the need to obtain more complete estimates of spawning escapement. In response, multiple agencies and entities began the Unalakleet River weir in 2010 funded by United States Fish and Wildlife Service's Office of Subsistence Management. The goal was to obtain estimates of the mainstem Chinook salmon escapement and age, sex, and length (ASL) composition. An estimated 505 Chinook salmon were enumerated during the 2016 season. High water and numerous pink salmon O. gorbuscha contributed to an incomplete count of Chinook salmon in 2016, therefore the escapement estimate should be considered a minimum count and run timing could not be determined. A total of 25 ASL samples were collected but did not meet minimum sample size requirements and could not be used to estimate female percentage or age composition. Despite issues with operations in 2016, the Unalakleet River weir is an important tool for fishery managers and increased oversight and training will ensure it remains a viable option for monitoring Chinook salmon in the Unalakleet River.

Author:
Publisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 20

View

Book Description

Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 74

View

Book Description
During 2005, wild (naturally-produced) and hatchery-reared Chinook salmon, Oncorhynchus tshawytscha, runs to the Ninilchik River were assessed with a weir to determine the stock composition of total escapements. The Ninilchik River Chinook salmon supplementation program has provided important sport fishing opportunities on the Ninilchik River and terminal fisheries. Continuation of the Chinook salmon assessment at Ninilchik River weir is recommended to insure that adequate escapement of wild Chinook salmon is maintained.

Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 44

View

Book Description
During 2004, wild (naturally-produced) and hatchery-reared Chinook salmon, Oncorhynchus tshawytscha, runs to the Ninilchik River were assessed with a weir to determine the stock composition of total escapements. This report examines the results of this study.

Author: Scott Kent
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 17

View

Book Description
Declining run sizes, coupled with state and federal restrictions and closures to the Unalakleet River Chinook salmon fisheries, have highlighted the need to obtain more complete estimates of the magnitude and age, sex, and length (ASL) composition of the spawning escapement.

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

View

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: Daryl Lescanec
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 35

View

Book Description
Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) annual escapements to the Deshka River were assessed from 2005 to 2014 to provide escapement counts and stock-specific biological information. Both Chinook and coho salmon were counted at a weir operated from approximately late May through mid-September each year, except for 2006 when coho salmon were counted through 16 August. The mean annual Chinook salmon weir count was 19,366 fish. Age composition for Chinook salmon averaged 30.8% age-1.2 fish, 50.4 % age-1.3 fish, and 16.7% age-1.4 fish. On average, females composed 48.3% of the runs. Chinook salmon run timing was consistent until 2013 and then quite variable in the last 2 years. On average, 50% (SE 8.1%) of the fish passed upstream of the weir by 20 June. Chinook salmon escapement goals were met for the years 2005-2007 and 2010-2014. The 2005-2014 mean annual coho salmon weir count was 18,684 fish. Above average coho salmon runs were observed in 2005 and 2006, whereas 2012 was the lowest count recorded since the weir was first operated in 1995. High water and a flood precluded complete coho salmon weir counts 2 of the 10 years. Coho salmon run timing was inconsistent (SD = 8 days at mean 50th percentile).