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Book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2019

Download or read book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2019 written by Keegan O. Birchfield and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2021

Download or read book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2021 written by Keegan O. Birchfield and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2020

Download or read book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2020 written by Keegan O. Birchfield and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2018

Download or read book Estimating Fish Abundance in the Kuskokwim River Using Sonar 2018 written by Keegan O. Birchfield and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2017

Download or read book Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2017 written by Keegan O. Birchfield and published by . This book was released on 2019 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Book Feasibility of Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2014 and 2015

Download or read book Feasibility of Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2014 and 2015 written by Naomi B. Brodersen and published by . This book was released on 2016 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2016

Download or read book Estimating Salmon Abundance in the Kuskokwim River Using Sonar 2016 written by Keegan O. Birchfield and published by . This book was released on 2019 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Kvichak River Side looking Sonar Smolt Abundance Estimation

Download or read book Kvichak River Side looking Sonar Smolt Abundance Estimation written by Daniel C. Huttunen and published by . This book was released on 1992 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Sonar Estimation of Summer Chum and Pink Salmon Abundance in the Anvik River 2023

Download or read book Sonar Estimation of Summer Chum and Pink Salmon Abundance in the Anvik River 2023 written by Jody D. Lozori and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alaska Department of Fish and Game (ADF&G), actively manages chum salmon fisheries in the Yukon River drainage. The purpose of the Anvik River sonar project is to monitor escapement of summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha in the Anvik River drainage, believed to be the largest producer of summer chum salmon in the Yukon River drainage (Hayes et al. 2008, Larson et al. 2017). Timely and accurate reporting of information from the Anvik River sonar project helps Yukon River fishery managers ensure the Anvik River Biological Escapement Goal (BEG) of 350,000 to 700,000 summer chum salmon is met (ADF&G 2004). This assessment is necessary to determine if summer chum salmon abundance will meet downstream harvest and upstream escapement needs. Fishery openings and closures may be based in part upon this assessment. This project uses imaging sonar equipment on the Anvik River to generate timely, in-season passage estimates of salmon (Brodersen 2021). Beach seine sampling is conducted to collect biological data used in characterizing the summer chum salmon run and tower estimates are used to apportion passage estimates to species. The project site is located approximately 76 km upstream from the mouth of the Anvik River (Figures 1 and 2) and is scheduled to operate continuously from approximately June 16 through July 26, 2023.

Book Estimates of Chinook Salmon Abundance in the Kenai River Using Split beam Sonar 2005

Download or read book Estimates of Chinook Salmon Abundance in the Kenai River Using Split beam Sonar 2005 written by James D. Miller and published by . This book was released on 2007 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses the results of estimating chinook salmon, Oncorhynchus tshawytscha, abundance in the Kenai River May-June and July-August 2005, using side-looking split-beam sonar technology.

Book Sonar Estimation of Summer Chum and Pink Salmon in the Anvik River Alaska 2019

Download or read book Sonar Estimation of Summer Chum and Pink Salmon in the Anvik River Alaska 2019 written by Naomi B. Brodersen and published by . This book was released on 2021 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonar (DIDSON) was used to estimate adult summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha passage in the Anvik River from June 16 to July 26, 2019. Apportionment to species was determined from data collected from tower counts. A total of 249,014 (SE 2,034) summer chum and 241 (SE 81) pink salmon were estimated to have passed the sonar site. A beach seine sample fishery was conducted to collect age, sex, and length information. Both sonar systems functioned well with minimal interruptions to operation. The range of ensonification was considered adequate for most fish that migrated upstream.