2017 Inriver Abundance and Run Timing of Kuskokwim River Chinook Salmon PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download 2017 Inriver Abundance and Run Timing of Kuskokwim River Chinook Salmon PDF full book. Access full book title 2017 Inriver Abundance and Run Timing of Kuskokwim River Chinook Salmon by Joshua N. Clark. Download full books in PDF and EPUB format.
Author: Joshua N. Clark
Publisher:
ISBN:
Category : Animal radio tracking
Languages : en
Pages : 32
Get Book Here
Book Description
A 2-sample mark-recapture experiment was conducted to estimate the abundance of adult Chinook salmon Oncorhynchus tshawytscha returning to the Kuskokwim River in 2017. Tagging occurred downriver from all known spawning tributaries, except the Eek River. All fish were marked with a dorsally attached spaghetti tag, and a subset of spaghetti tagged fish was also fitted with a radio tag to evaluate assumptions of the abundance estimator and monitor upriver movement. Radiotagged fish were tracked throughout the study area using a network of telemetry stations and a series of aerial telemetry surveys. A total of 8 escapement monitoring weirs were operated upriver from the tag site and served as recapture locations for tagged fish. Inriver abundance of Chinook salmon upstream of rkm 67 in 2017 was 125,339 fish (95% CI: 95,954-149,842). Radiotagged Chinook salmon traveling to upriver tributaries were captured and tagged earlier in the run compared to tagged fish migrating to middle river tributaries. Chinook salmon returning to lower river tributaries were captured and tagged throughout the entire run. Chinook salmon swam at a median speed of 46 rkm/day (range: 38-54 rkm/day) through all portions of the mainstem Kuskokwim River upstream from Bethel.
Author: Joshua N. Clark
Publisher:
ISBN:
Category : Animal radio tracking
Languages : en
Pages : 32
Get Book Here
Book Description
A 2-sample mark-recapture experiment was conducted to estimate the abundance of adult Chinook salmon Oncorhynchus tshawytscha returning to the Kuskokwim River in 2017. Tagging occurred downriver from all known spawning tributaries, except the Eek River. All fish were marked with a dorsally attached spaghetti tag, and a subset of spaghetti tagged fish was also fitted with a radio tag to evaluate assumptions of the abundance estimator and monitor upriver movement. Radiotagged fish were tracked throughout the study area using a network of telemetry stations and a series of aerial telemetry surveys. A total of 8 escapement monitoring weirs were operated upriver from the tag site and served as recapture locations for tagged fish. Inriver abundance of Chinook salmon upstream of rkm 67 in 2017 was 125,339 fish (95% CI: 95,954-149,842). Radiotagged Chinook salmon traveling to upriver tributaries were captured and tagged earlier in the run compared to tagged fish migrating to middle river tributaries. Chinook salmon returning to lower river tributaries were captured and tagged throughout the entire run. Chinook salmon swam at a median speed of 46 rkm/day (range: 38-54 rkm/day) through all portions of the mainstem Kuskokwim River upstream from Bethel.
Author: Nicholas James Smith
Publisher:
ISBN:
Category : Animal radio tracking
Languages : en
Pages : 38
Get Book Here
Book Description
A 2-sample mark-recapture experiment was conducted to estimate the abundance and upriver migration characteristics of adult Chinook salmon Oncorhynchus tshawytscha returning to the Kuskokwim River in 2016. Tagging occurred downriver from all known spawning tributaries, except the Eek River. A total of 621 Chinook salmon were marked with radio and spaghetti tags, of which 527 continued upriver migration and were used to estimate abundance. Radiotagged fish were tracked throughout the study area using a network of telemetry stations and a series of aerial telemetry surveys. Upriver escapement monitoring weirs served as 7 recapture locations, representing lower, middle, and upper river tributaries. A total of 21,590 Chinook salmon were evaluated for tags, and total tag recoveries was estimated at 94. Inriver abundance of Chinook salmon upstream of rkm 67 was 120,000 fish (95% CI: 99,304-147,502). Radiotagged Chinook salmon traveling to upriver tributaries were captured and tagged earlier in the run compared to tagged fish migrating to middle river tributaries. Chinook salmon returning to lower river tributaries were captured and tagged throughout the entire run. Chinook salmon swam at a median speed of 36 rkm/day (range: 31-41 rkm/day) through all portions of the mainstem Kuskokwim River upstream from Bethel.
Author: Nicholas James Smith
Publisher:
ISBN:
Category : Animal radio tracking
Languages : en
Pages : 36
Get Book Here
Book Description
A 2-sample mark-recapture experiment was conducted to estimate the abundance and upriver migration characteristics of adult Chinook salmon Oncorhynchus tshawytscha returning to the Kuskokwim River in 2015. Tagging occurred downriver from all known spawning tributaries, except the Eek River. All fish were marked with a dorsally attached spaghetti tag, and a subset of spaghetti tagged fish was also fitted with a radio tag to evaluate assumptions of the abundance estimator and monitor upriver movement. Radiotagged fish were tracked throughout the study area using a network of telemetry stations and a series of aerial telemetry surveys. Seven escapement monitoring weirs were operated upriver from the tag site and served as recapture locations for tagged fish. Inriver abundance of Chinook salmon upstream of rkm 67 was 115,541 fish (95% CI: 105,370-125,346). Radiotagged Chinook salmon traveling to upriver tributaries were captured and tagged earlier in the run compared to tagged fish migrating to middle river tributaries. Chinook salmon returning to lower river tributaries were captured and tagged throughout the entire run.
Author: Harold A. Gangmark
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 30
Get Book Here
Book Description
Author: Lisa Ann Stuby
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 55
Get Book Here
Book Description
Results of two-sample mark-recapture experiments, which were conducted to estimate inriver abundance of chinook salmon, Oncorhynchus tshawytscha, in the middle and upper Kuskokwim River and associated tributaries using radiotelemetry techniques during 2002-2006.
Author: Zachary W. Liller
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 40
Get Book Here
Book Description
Because it is not possible to count all chinook salmon that return to the Kuskokwim River, estimates of annual abundance and escapement are made using a maximum likelihood model. The model was used to estimate the 2015 drainage-wide runs size. This report discusses the model inputs, model results, uncertainty of the estimates, and conclusions of the reconstruction model.
Author: James William Savereide
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 44
Get Book Here
Book Description
Author: Jordan Head
Publisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 0
Get Book Here
Book Description
A maximum likelihood model was developed to estimate the 1968–2020 drainagewide run size and escapement of Nushagak River Chinook salmon (Oncorhynchus tshawytscha). The model simultaneously combined information by direct observations of escapement at 8 locations (1 tower and 7 aerial surveys); harvest of fish from commercial, subsistence, and sport fisheries; inriver abundance indices from the Nushagak River sonar project; and inriver abundance estimates from acoustic tag and mark–recapture studies. Results showed that reconstructed total run size ranged from 74,000 to 629,000 Chinook salmon with an average run size of 282,000 fish, and escapement ranged from 49,000 to 476,000 fish with an average of 210,000 fish. The model estimated total run and escapement appeared to be reasonable and tracked well with previous estimates. The major deficiency of this model is the absence of overlapping, long-term escapement and run monitoring data.
Author: Bryce Douglas Mecum
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 80
Get Book Here
Book Description
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.
Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 46
Get Book Here
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.
