Feasibility of Estimating Salmon Abundance in the Kuskokwim River Using Sonar, 2014 and 2015 PDF Download
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Author: Naomi B. Brodersen
Publisher:
ISBN:
Category : Drift net fishing
Languages : en
Pages : 20
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Book Description
A study was conducted from 2014 to 2015 to assess the feasibility of using sonar, in combination with gillnetting, to estimate salmon abundance in the Kuskokwim River. Ten areas in the lower river were surveyed. Bottom profiles were analyzed for suitability of sonar operation. Split-beam sonar was operated on the gradual-sloping bank, and imaging sonar on the steep-sloping bank. The feasibility of using drift gillnets was assessed in 2015. A range of drift gillnet mesh sizes were fished on both banks at each site.
Author: Naomi B. Brodersen
Publisher:
ISBN:
Category : Drift net fishing
Languages : en
Pages : 20
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Book Description
A study was conducted from 2014 to 2015 to assess the feasibility of using sonar, in combination with gillnetting, to estimate salmon abundance in the Kuskokwim River. Ten areas in the lower river were surveyed. Bottom profiles were analyzed for suitability of sonar operation. Split-beam sonar was operated on the gradual-sloping bank, and imaging sonar on the steep-sloping bank. The feasibility of using drift gillnets was assessed in 2015. A range of drift gillnet mesh sizes were fished on both banks at each site.
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 72
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Book Description
A 3-year study was initiated in 2014 to assess the feasibility of using sonar, in combination with drift gillnetting, to estimate salmon abundance in the Kuskokwim River. This report presents the results of the final year of feasibility assessment in 2016. After identifying a location with a suitable bottom profile, split-beam and imaging sonars were deployed on the gentle sloping left bank and an imaging sonar was deployed on the steep right bank. A range of drift gillnet mesh sizes were deployed along both banks to apportion sonar counts to species. Following a late project start, there were few interruptions in apportionment and sonar counts. Consistent fishing and sonar operation allowed estimation of daily and total passage of most salmon and whitefish species. A general comparison was made between the 2016 sonar, Bethel test fishery, Kuskokwim River Chinook salmon mark-recapture, and weir escapement projects. Run timing tracked well between Bethel test fishery and the Kuskokwim River sonar with small discrepancies between chum to sockeye salmon ratios that may be due to the differing mesh sizes employed by each project. Chinook salmon was the only species assessed by other projects for drainagewide estimates; a comparison was made between sonar passage estimates (with annotations concerning harvest) and run size estimates from the mark-recapture project and escapement estimates from the run reconstruction model. When considering the shorter sonar sampling season, preliminary total passage estimates of Chinook salmon were within 90% CI across all projects. When including the modifications recommended by the feasibility study, sonar has the potential to accurately estimate salmon and whitefish abundance, in real time, on the Kuskokwim River for future management purposes.
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 40
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Book Description
In 2017, sonars were operated on the Kuskokwim River to estimate the abundance and run timing of Pacific salmon Oncorhynchus spp. following recommendations from a 2014–2016 feasibility study. After identifying a location with a suitable bottom profile, split-beam and imaging sonar were deployed on the gentle sloping left bank and an imaging sonar was deployed on the steep right bank. Species-specific fish passage abundance estimates were generated using a 3-step process. First, all fish passing the site were estimated, without regard to species. Second, species compositions were estimated and adjusted using selectivity parameters. Finally, species composition estimates were applied to total passage estimates to create species-specific abundance estimates. An unadjusted estimate of 2,531,397 fish passed the sonar site between June 1 and July 26. However, right bank vertical sonar coverage was incomplete in 2017 due to late installation of a spreader lens. An expansion based on 2016 and 2017 left bank counts was used to produce estimates of right bank missed passage by species. Despite adjustments, there were still substantial differences between sonar estimates and Kuskokwim River run reconstruction and mark–recapture projects estimates of Chinook salmon Oncorhynchus tshawytscha that may be due to abnormal river conditions in 2017 (i.e., low water levels).
Author: Naomi B. Brodersen
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 111
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Book Description
A study was conducted from 2012 to 2014 to assess the feasibility of using sonar, in combination with gillnetting and a fish wheel, to estimate salmon abundance in the Tanana River. Eight sites between Cosna Bluff and the confluence of the Kantishna and Tanana rivers were surveyed, bottom profiles were analyzed for suitability of sonar operation, and a site near Manley Hot Springs was selected. Split-beam sonar was operated on the left bank, and imaging sonar on the right bank. Drift and set gillnets were used to apportion the left bank sonar estimates, and drift gillnets and a fish wheel were used to apportion the right bank sonar estimates. Both sonar and test fishing methods were modified and assessed for effectiveness throughout both seasons. The sonars were found to provide effective coverage with 95% of fish passing within 80 m of the transducer on the left bank, and within 16 m on the right bank. The drift gillnets and fish wheel proved to be effective fishing methods, though refinement of these methods should be a goal in future seasons. Based on the information obtained, estimating salmon abundance in the Tanana River using sonar, with drift gillnets and a fish wheel used for species apportionment is feasible.
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
Sonars were operated on the Kuskokwim River in 2019 to estimate the inseason abundance of Pacific salmon Oncorhynchus and nonsalmon species. After identifying a suitable bottom profile location, split-beam and imaging sonar were deployed on the gentle sloping left bank, and an imaging sonar was deployed on the steep right bank. Species-specific fish passage abundance estimates were generated using a 3-step process. All fish passing the site were estimated without regard to species. Species composition was estimated and adjusted using net selectivity parameters. Species composition estimates were then applied to total passage estimates to create species-specific abundance estimates. An estimated 2,871,514 fish passed the sonar site between May 31 and July 26.
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
Sonars were operated on the Kuskokwim River in 2021 to estimate the inseason abundance of Pacific salmon Oncorhynchus and nonsalmon species. After identifying a location with a suitable bottom profile, split-beam and imaging sonar were deployed on the gentle sloping left bank, and an imaging sonar was deployed on the steep right bank. Species-specific fish passage abundance estimates were generated using a 3-step process. All fish passing the site were estimated without regard to species. Species composition was estimated and adjusted using net selectivity parameters. Species composition estimates were then applied to total passage estimates to create species-specific abundance estimates. An estimated 2,704,816 fish passed the sonar site between June 1 and August 26. The Chinook salmon O. tshawytscha passage estimate was 102,552 fish (95% CI 84,438–120,666). The sockeye salmon O. nerka passage estimate was 745,037 fish (95% CI 696,241–793,833). The chum salmon O. keta passage estimate was 25,689 fish (95% CI 14,550–36,828). The coho salmon O. kisutch passage estimate was 237,285 fish (95% CI 209,320–265,250). The pink salmon O. gorbuscha passage estimate was 41,912 fish (95% CI 30,758–53,066). All nonsalmon species totaled 1,552,341 fish (95% CI 1,415,098–1,689,584).
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
Sonar was operated on the Kuskokwim River in 2020 to estimate the inseason abundance of Pacific salmon Oncorhynchus and nonsalmon species. After identifying a suitable bottom profile location, split-beam and imaging sonar were deployed on the gentle sloping left bank, and an imaging sonar was deployed on the steep right bank. Species-specific fish passage abundance estimates were generated using a 3-step process. All fish passing the site were estimated without regard to species. Species composition was estimated using drift gillnet catches adjusted by net selectivity. Species composition estimates were then applied to total passage estimates to create species-specific abundance estimates. An estimated 2,823,393 fish passed the sonar site between June 3 and August 25. The Chinook salmon O. tshawytscha passage estimate was 106,265 fish (95% CI 90,344–122,186). The sockeye salmon O. nerka passage estimate was 576,045 fish (95% CI 509,922–642,168). The chum salmon O. keta passage estimate was 76,369 fish (95% CI 55,954–96,784). The coho salmon O. kisutch passage estimate was 163,708 (95% CI 127,238–200,178). The pink salmon O. gorbuscha passage estimate was 19,793 fish (95% CI 12,239–27,347. All nonsalmon species totaled 1,881,213 fish (95% CI 1,742,348–2,020,078).
Author: Keegan O. Birchfield
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
In 2018, sonars were operated on the Kuskokwim River to estimate the inseason abundance of Pacific salmon Oncorhynchus and nonsalmon species. After identifying a location with a suitable bottom profile, split-beam and imaging sonars were deployed on the gentle sloping left bank, and an imaging sonar was deployed on the steep right bank. Species-specific fish passage abundance estimates were generated using a 3-step process. First, all fish passing the site were estimated without regard to species. Second, species compositions were estimated and adjusted using selectivity parameters. Species composition estimates were then applied to total passage estimates to create species-specific abundance estimates. An estimated 2,060,581 fish passed the sonar site between June 2 and July 26. However, left-bank sonar counts were disabled from June 2 to June 3, and right-bank sonar counts were disabled from June 22 to June 28; expansions based on 2018 counts when sonars were operational were used to adjust estimates of missed passage by stratum and species (for a new total passage of 2,163,768 fish). The backup adaptive resolution imaging sonar (ARIS) lacked automatic tilt capability; therefore, total estimates of passage are considered underestimates. Several risk mitigating plans were proposed to prevent sonar downtime in the future. Finally, discrepancies between concurrent inseason indices and sonar estimates of chum salmon abundance led to recommendations for deeper offshore apportionment nets during high water years.
Author: April V. Faulkner
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 113
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Book Description
Report discusses the results of estimating Pacific salmon abundance in the Kenai River in 2001-2003, using split-beam sonar technology.
Author: Suzanne L. Maxwell
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 135
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Book Description
Report discusses the results of estimating Pacific salmon abundance in the Nushagak River, using split-beam sonar technology.
