Download or read book 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 written by Suzanne L. Maxwell and published by . This book was released on 2007 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses the results of estimating Pacific salmon abundance in the Nushagak River, using split-beam sonar technology.
Download or read book The Feasibility of Using a Split beam Sonar to Estimate Salmon Passage on the Kenai River as a Potential Replacement for an Echo counting Bendix Sonar written by April V. Faulkner and published by . This book was released on 2007 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses the results of estimating Pacific salmon abundance in the Kenai River in 2001-2003, using split-beam sonar technology.
Download or read book The Feasibility of Estimating Migrating Salmon Passage Rates in Turbid Rivers Using a Dual Frequency Idenfication Sonar DIDSON 2002 written by Suzanne L. Maxwell and published by . This book was released on 2004 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Feasibility of Using Sonar to Estimate Adult Sockeye Salmon Passage in the Lower Kvichak River written by April V. Faulkner and published by . This book was released on 2015 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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.
Download or read book Feasibility of Split beam Hydroacoustic Gear to Provide Estimates of Coho Salmon Abundance in the Kenai River written by Kyle D. Vaught and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book A Comparison of Estimates from 2 Hydroacoustic Systems Used to Assess Sockeye Salmon Passage in 5 Alaska Rivers written by Suzanne L. Maxwell and published by . This book was released on 2011 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Use of Dual frequency Identification Sonar to Verify Split beam Estimates of Salmon Flux and to Examine Fish Behaviour in the Fraser River written by Yunbo Xie and published by . This book was released on 2005 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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).
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.
Download or read book Feasibility of Estimating Salmon Abundance in the Tanana River Using Sonar 2012 2014 written by Naomi B. Brodersen and published by . This book was released on 2016 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book An Evaluation of the Bendix Smolt Counter Used to Estimate Outmigrating Sockeye Salmon Smolt in the Kvichak River Alaska and the Development of a Replacement Sonar 2000 2001 written by Suzanne L. Maxwell and published by . This book was released on 2009 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report discusses the results of evaluating split-beam sonar technology while estimating Pacific sockeye salmon abundance in the Kvichak River.
Download or read book Sonar Estimation of Salmon Passage in the Yukon River Near Pilot Station Alaska 2010 written by Jody D. Lozori and published by . This book was released on 2020 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pilot Station sonar project has provided daily passage estimates for Chinook (Oncorhynchus tshawytscha), chum (O. keta), and coho (O. kisutch) salmon for most years since 1986. Fish passage estimates for each species were generated in 2010 using a 2-component process: (1) estimation of total fish passage using 120 kHz split-beam sonar and a dual-frequency identification sonar (DIDSON), and (2) apportionment to species by sampling using a suite of gillnets of various mesh sizes. An estimated 3,683,588 fish passed through the sonar sampling area between June 1 and September 7. Of those fish, 662,329 passed along the right bank and 3,021,259 passed along the left bank. Included, with 90% confidence intervals, were 112,605 ± 49,275 large Chinook salmon (>655 mm mideye tail fork), 25,294 ± 36,165 small Chinook salmon (=655 mm mideye tail fork), 1,423,372 ± 89,356 summer chum salmon, 458,103 ± 40,797 fall chum salmon, 177,724 ± 12,489 coho salmon, 919,036 ± 63,942 pink salmon, 281,456 ± 37,151 cisco, 175,749 ± 21,348 humpback whitefish, 19,835 ± 6,581 broad whitefish, 49,250 ± 31,895 sheefish, and 41,164 ± 29,700 other species.
Download or read book Feasibility of Using Sonar to Estimate Adult Coho Salmon Returns to the Kenai River written by Terrence N. Bendock and published by . This book was released on 1994 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sonar Estimation of Salmon Passage in the Yukon River Near Pilot Station 2019 written by Ryan P. Morrill and published by . This book was released on 2021 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pilot Station sonar project has provided daily passage estimates of Chinook (Oncorhynchus tshawytscha), chum (O. keta), and coho (O. kisutch) salmon for most years since 1986. Fish passage estimates for each species were generated in 2019 using a 2-component process: (1) estimation of total fish passage with 120 kHz split-beam sonar and an adaptive resolution imaging sonar, and (2) apportionment to species by sampling using a suite of gillnets of various mesh sizes. An estimated 3,161,920 fish passed through the sonar sampling area between June 2 and August 31. Of those fish, 690,494 passed along the right bank, and 2,471,426 passed along the left bank. Included, with 90% confidence intervals, were 172,242 ± 18,964 large Chinook salmon (>655 mm to fork of tail), 47,382 ± 7,725 small Chinook salmon (≤655 mm to fork of tail), 1,402,925 ± 85,902 summer chum salmon, 842,041 ± 37,151 fall chum salmon, 86,401 ± 9,530 coho salmon, 42,353 ± 8,893 pink salmon, 270,434 ± 36,596 cisco, 196,905 ± 30,456 humpback whitefish, 25,694 ± 5,256 broad whitefish, 22,673 ± 5,948 sheefish, and 52,870 ± 5,659 other species.
Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2003 written by Heath D. Sandall and published by . This book was released on 2006 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Aniak River sonar project has provided daily fish passage estimates for most years since 1980. During this time, the project has undergone important changes including changing from the original Bendix sonar to dual-beam and is in the process of migrating to a high frequency imaging sonar (DIDSON). This season, the project adopted a new sampling protocol in which the sonar operated for three 4-hour blocks each day (0000-0400, 0800-1200, and 1600-2000 hours). The Aniak River sonar project was operational from 28 June through 31 July in 2003. During this period, an estimated 393,396 fish (SE 7,871) passed through the ensonified area. The peak passage of 23,208 fish occurred on 14 July and the 50% passage date occurred on 17-July. The escapement estimate was primarily comprised of age-0.3 fish (80.6%), while age -0.4 (17.9%), -0.5 (1.1%) and -0.2 (0.4%) classes were also present. Side-by-side comparisons of counts obtained with the BioSonics and DIDSON equipment suggest undercounting with the BioSonics at high densities.
Download or read book Sonar Estimation of Salmon Passage in the Yukon River Near Pilot Station 2020 written by Ryan P. Morrill and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pilot Station sonar project has provided daily passage estimates of Chinook (Oncorhynchus tshawytscha), chum (O. keta), and coho (O. kisutch) salmon for most years since 1986. Fish passage estimates for each species were generated in 2020 using a 2-component process: (1) estimation of total fish passage with 120 kHz split-beam sonar and an adaptive resolution imaging sonar, and (2) apportionment to species by sampling using a suite of gillnets of various mesh sizes. An estimated 1,821,202 fish passed through the sonar sampling area between June 7 and September 7. Of those fish, 378,545 passed along the right bank and 1,442,657 along the left bank. Included, with 90% confidence intervals, were 124,905 ± 17,588 large Chinook salmon (>655 mm from middle of eye to tail fork [METF]), 37,347 ± 7,100 small Chinook salmon (≤655 mm METF), 692,602 ± 36,325 summer chum salmon, 262,439 ± 17,810 fall chum salmon, 107,680 ± 6,843 coho salmon, 207,942 ± 18,745 pink salmon, 163,546 ± 21,976 cisco, 146,162 ± 18,243 humpback whitefish, 21,352 ± 3,328 broad whitefish, 24,849 ± 5,361 sheefish, and 32,378 ± 4,027 other species.
