Author: Jeffrey Todd WilliamsPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
Book Description
Estimation of Chinook Salmon Escapement in the Taku River, 2013
Author: Jeffrey Todd WilliamsPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
Book Description
Smolt Abundance and Adult Escapement of Chinook Salmon in the Taku River, 2022-2024
Author: Jeffrey T. WilliamsPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
Book Description
Chinook salmon Oncorhynchus tshawytscha smolt abundance and adult escapement will be estimated for the Taku stock of Chinook salmon originating from the Canadian portions of the Taku River drainage above the U.S./Canada border. This large glacial river flows into Taku Inlet about 30 km northeast of Juneau, Alaska. A modified Petersen estimator will be used to estimate smolt abundance for the 2020-2022 brood years, which are the smolt leaving the system during 2022-2024. Chinook salmon smolt will be captured from April through June, systematically sampled to estimate mean length and weight, and all healthy fish will be implanted with a coded wire tag and marked with an adipose fin clip. Escapement of large (≥660 mm; mid eye to fork of tail) and medium (401-659 mm; mid eye to fork of tail) Taku River adult Chinook salmon in 2022-2024 will be estimated using mark-recapture methodology. Adult Chinook salmon will be captured and marked near Canyon Island in the lower Taku River using fish wheels and drift gillnets from late April through early August. Each healthy fish will be tagged with a uniquely numbered, solid-core spaghetti tag and two secondary marks will be applied. Fish will be sampled for data used in age, sex, and length composition estimates of the spawning escapement.
Estimation of the Escapement of Chinook Salmon in the Unuk River in 2003
Author: Jan L. WellerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 94
Book Description
Spawning Abundance of Chinook Salmon in the Taku River in 2003
Author: Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 178
Book Description
A cooperative study involving the Department of Fisheries and Oceans Canada, the Alaska Department of Fish and Game, and the Taku River Tlingit First Nation was conducted to estimate the number of spawning Chinook salmon Oncorhynchus tshawytscha in the Taku River in 2003 with a mark-recapture experiment. Fish were captured at Canyon Island on the lower Taku River with fish wheels from May through August and were individually marked with back-sewn, solid-core spaghetti tags. All tagged fish were also batch marked with an opercle punch plus removal of the left axillary appendage. Sampling on the spawning grounds in tributaries was used to estimate the fraction of the population that had been marked. The estimated spawning abundance of small Chinook salmon ( 400 mm long; mid-eye to fork of tail) was 3,489 (SE = 1,052). Spawning abundance of medium-size Chinook salmon (401-659 mm) was estimated to be 16,780 (SE = 2,274). Finally, spawning abundance of large-size fish (= 660 mm) was estimated to be 36,435 (SE = 6,705), and the estimated total of all fish was 56,704 (SE = 7,158). The sum of the peak aerial survey counts of large spawning Chinook salmon conducted at five index tributaries of the Taku River was 16% of the mark-recapture estimate. Age 1.3 fish (1998 brood year) constituted an estimated 40% of the spawning population, followed by age 1.2 fish (1999 brood year), which constituted an estimated 29% of the population
Unalakleet River Chinook Salmon Escapement Monitoring and Assessment, 2013-2014
Author: Scott KentPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 17
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.
Chinook Salmon Escapement and Run Timing in the Gulkana River, 2013-2015
Author: Corey J. SchwankePublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 32
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.
Estimation of the Escapement of Chinook Salmon in the Unuk River in 2002
Author: Jan L. WellerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 36
Book Description
Production of Coho and Chinook Salmon in the Taku River, 2013
Author: Jeffrey Todd WilliamsPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 49
Book Description
Optimal Production of Chinook Salmon from the Taku River Through the 2001 Year Class
Author: Scott Alan McPhersonPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 100
Book Description
Results of a study of the biological escapement goal for Chinook salmon, Oncorhynchus tshawytscha, from the Taku River. This study was investigated with information from a stock assessment program (1973-2007), catch sampling programs of the Canadian inriver gillnet fishery, the U.S. commercial gillnet fishery in Taku Inlet, the troll fishery in Southeast Alaska, and the U.S. recreational fishery near Juneau.
Estimation of the Escapement of Chinook Salmon in the Unuk River in 2004
Author: Jan L. WellerPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
Book Description
This report estimates the abundance of medium and large chinook salmon Oncorhynchus tshawytscha that returned to spawn in the Unuk River in 2004, using a two-event mark-recapture experiment.