Download or read book Use of Split Beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River North Carolina written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT MAGOWAN, KEVIN JAMES. Use of Split-beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River, North Carolina. (Under the direction of Joseph E. Hightower.) Annual in-river population estimates of anadromous fishes in the Roanoke River would be useful for managing this resource. The goal for some species (American shad Alosa sapidissima, alewife Alosa pseudoharengus, and blueback herring Alosa aestivalis) is to monitor current restoration efforts. For other species (striped bass Morone saxatilis, hickory shad Alosa mediocris and white perch Morone americana), the goal is to manage sustainable commercial and recreational fisheries. Hydroacoustic methods are useful for estimating the abundance of anadromous fishes, because these methods are non-intrusive, have been proven to work in other river systems, and are capable of generating real-time population estimates. The goal of this project was to estimate the numbers of anadromous fishes returning to the Roanoke River in 2006 and 2007. We used fixed-location split-beam sonar in conjunction with drift gill netting and boat electrofishing to estimate run size of alewife, American shad, blueback herring, hickory shad, striped bass and white perch migrating upstream past a study site at river kilometer 64 near Williamston, North Carolina. The default estimates (and SEs) for 2006, assuming a uniform cross-channel distribution of upstream migrants and a fixed river depth cut-off point to separate fish migrating near the river bank (i.e., in water 3 m deep) from fish migrating in the river channel (i.e., in water 3 m deep), were: total run size 819,063 (Â" 31,234), alewife 60,622 (Â" 7,871), American shad 35,483 (Â" 4,936), blueback herring 88,281 (Â" 8,689), hickory shad 40,465 (Â" 6,155), striped bass 217,439 (Â" 14,236), white perch 83,035 (Â" 8,054), and other fish species 293,737 (Â" 13,356). In 2006, the estimates were generated for fish that migrated past the monitoring site from March 18 to May 29.
Download or read book Use of Split beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River North Carolina written by Kevin James Magowan and published by . This book was released on 2008 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Roanoke River, cartesian coordinates, range from shore, Williamston, North Carolina, Albemarle Sound, Split-beam, sonar, channel, electrofishing, fish passage, American shad, striped bass, white perch, DIDSON, run-size, population, fish, anadromous, target strength, drift gill netting, hickory shad, blueback herring, alewife, in-river population estimates, bank, hydroacoustic.
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 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 Introduction to the Use of Sonar Systems for Estimating Fish Biomass written by J. Burczynski and published by . This book was released on 1979 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rome : Food and Agriculture Organization of the United Nations, 1979.
Download or read book Uncertainty in Fish Location Using a Split Beam Sonar written by Mark L. Ayers and published by . This book was released on 2001 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The enumeration of fish is of critical importance to the management of both commercial and sport fisheries in Alaska and worldwide. Current methods for riverine fish enumeration are inaccurate and unreliable. Improved fish counting accuracy in Alaskan rivers by acoustic methods is required. A split beam sonar system in the presence of noise is modeled. The sonar system including the received sonar pulse, receiver system, transducer beam pattern, propagation losses, and noise are modeled. An analysis of the effects of noise, pulse duration and sampling frequency on the uncertainty in fish location is presented. Signal to noise ratios less than 5 dB can cause significant errors in the calculation of received signal phase. A stationary fish with a signal to noise ratio of 15 dB has approximately plus-minus 0.001 degrees of uncertainty in the angles of arrival. Reducing the SNR to 3 dB the uncertainty increases to plus-minus 3.6 degrees in the angles of arrival"--Leaf iii.
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 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 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).
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).
Download or read book Use of Split beam Sonar to Enumerate Chandalar River Fall Chum Salmon 2002 i e 2000 written by Bruce M. Osborne and published by . This book was released on 2002 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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.
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.
Download or read book Sonar Estimation of Fall Chum Salmon Abundance in the Sheenjek River 2003 written by Roger D. Dunbar and published by . This book was released on 2006 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reports on the Hydroacoustic Technology Incorporated (HTI) fixed-location, split-beam sonar, which was used to estimate chum salmon, Oncorhynchus keta, escapement in the Sheenjek River from August 9 to September 26, 2003.
Download or read book Sonar Estimation of Fall Chum Salmon Abundance in the Sheenjek River 2004 written by Roger D. Dunbar and published by . This book was released on 2008 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reports on the Hydroacoustic Technology Incorporated (HTI) fixed-location, split-beam sonar, which was used to estimate chum salmon, Oncorhynchus keta, escapement in the Sheenjek River from August 8 to September 25, 2004.
