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Author: Nicholas James Smith Publisher: ISBN: Category : Animal radio tracking Languages : en Pages : 38
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 : 38
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
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: Jordan Head Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 34
Book Description
We conducted a 2-sample mark-recapture experiment using radiotelemetry methods to estimate the abundance of adult Chinook salmon in the middle and upper Kuskokwim River in 2014. Fish were captured using drift gillnets and fish wheels in the mainstem Kuskokwim River at river kilometer (rkm) 270 near the community of Kalskag. Chinook salmon were marked with radio and T-bar anchor tags. Tagged fish were tracked throughout the study area using stationary and aerial telemetry methods. Four weirs located upriver from the tag site were used to recapture tagged Chinook salmon. The abundance of Chinook salmon upriver of rkm 294 was 61,255 (95% CI: 49,021-80,985).
Author: James William Savereide Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 46
Book Description
An age-structured state-space spawner–recruit model was fit to estimates of relative and absolute abundance, harvest, and age composition for Copper River Chinook salmon (Oncorhynchus tshawytscha) from 1980 to 2016. Bayesian statistical methods were employed to assess uncertainty in the presence of measurement error, serial correlation, and missing data. Ricker stock-recruit parameters and management reference points were estimated, including the escapement that provides for maximum sustained yield (SMSY). It is recommended that a sustainable escapement goal range of 18,500 to 33,000 fish be adopted for Copper River Chinook salmon. Escapement is evaluated by subtracting estimates of inriver harvest from estimates of inriver abundance. Escapements within this range have a high probability of producing sustainable yields.
Author: Jordan Head Publisher: ISBN: Category : Chinook salmon fisheries Languages : en Pages : 0
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
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 : 0
Book Description
A maximum likelihood model was used to estimate the 2022 drainagewide run size and escapement of Kuskokwim River Chinook salmon (Oncorhynchus tshawytscha). The total run was estimated to be 142,495 (95% CI: 107,579–188,743) fish, and escapement was estimated to be 107,980 (95% CI: 73,064–154,228) fish. Model estimates were informed by direct observations of the 2022 escapement at 3 weirs and 2022 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 2022 run and escapement. The 2022 total run of Chinook salmon was below the 1976–2021 average of 211,081 fish. The drainagewide sustainable escapement goal of 65,000–120,000 was met in 2022. The 2022 Kuskokwim River Chinook salmon forecast is for a range of 115,000–170,000 fish.
Author: Adam M. Reimer Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 62
Book Description
A stock-specific abundance and run timing model (SSART) was fit to relative and absolute estimates of abundance, genetic stock identification data, radiotelemetry data, and estimates of harvest for Kenai River Chinook salmon (Oncorhynchus tshawytscha) from 2007 to 2014. The methods follow a model of the 2007-2012 data except that inference is restricted to Chinook salmon 75 cm mid eye to tail fork (METF) or longer for all results in this report. Bayesian statistical methods were employed to estimate inriver abundance and run timing by stock at river mile 8.6 of the Kenai River. Abundance of early-run Chinook salmon ranged from 1,940 (SE 307) in 2013 to 8,637 (SE 2,215) in 2007. Abundance of late-run Chinook salmon ranged from 9,949 (SE 2,138) in 2010 to 37,180 (SE 10,340) in 2007. Fish from Killey River-Benjamin Creek, Funny River-Slikok Creek, and Quartz-Crescent creeks migrated upstream primarily prior to 30 June; fish from Grant Creek and Russian River migrated upstream primarily between 16 June and 31 July; and fish from Mainstem Kenai River-Juneau Creek migrated upstream primarily after 16 June. Tributary stocks had greater relative abundance within the run before 16 June and the Mainstem-Juneau Creek stock had greater relative abundance after 30 June. Between 16 June and 30 June, tributary stocks had greater relative abundance in 6 of 8 years while Mainstem-Juneau Creek fish had greater relative abundance in the other 2 years.
Author: Nicholas James Smith
Author: Nicholas James Smith
Author: Nicholas James Smith
Author: Jordan Head
Author: Harold A. Gangmark
Author: James William Savereide
Author: James William Savereide
Author: Jordan Head
Author: Bryce Douglas Mecum
Author: Sean D. Larson
Author: Adam M. Reimer