The Feasibility of Using a Split-beam Sonar to Estimate Salmon Passage on the Nushagak River as a Potential Replacement for an Echo-counting Bendix Sonar PDF Download
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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.
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.
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 : Fish surveys
Languages : en
Pages : 78
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Book Description
Describes testing of a dual frequency idenfication sonar (DIDSON) to count migrating adult salmon in turbid Alaskan rivers as a replacement for Bendix echo counting sonars.
Author: April V. Faulkner
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 118
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Book Description
The feasibility of using sonar in the lower Kvichak River to assess adult sockeye salmon Oncorhynchus nerka passage was evaluated as a possible replacement for the existing inriver gillnet test fishery.
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: Kyle D. Vaught
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 22
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Book Description
Reports on the feasibility of using split-beam sonar to facilitate data collection for estimating riverine abundance estimates of coho salmon (Oncorhynchus kisutch) in the Kenai River. Drift gill nets and fish wheels were also used to collect length frequency data; diurnal patterns in fish passage were also documented.
Author: Suzanne L. Maxwell
Publisher:
ISBN:
Category : Copper River (Alaska)
Languages : en
Pages : 155
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Book Description
Report discusses the relationship between salmon escapement estimates obtained from the 2 sonar systems used--Bendix echo-counting sonar and a dual-frequency identification sonar (DIDSON).
Author: Yunbo Xie
Publisher:
ISBN:
Category : Echo sounding in fishing
Languages : en
Pages : 68
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Book Description
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 : 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.
