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 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 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 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 Fishery Data Series written by and published by . This book was released on 1996 with total page 716 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 Feasibility of Capturing and Marking Juvenile Coho Salmon for Stock Assessment in the Kenai River written by Jamie A. Carlon and published by . This book was released on 1992 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report of a study the aim of which was to estimate the harvest of Kenai River (southcentral Alaska) coho salmon (Oncorhynchus kisutch) in the commercial fishery while a companion project is investigating techniques to estimate escapement.
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 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 Use of Dual beam Hydroacoustic Gear to Provide In river Estimates of Coho Salmon Abundance written by Kyle D. Vaught and published by . This book was released on 1992 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports on the feasibility of using dual 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 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 Amendment Kenai River Chinook Salmon Sonar Assessment at River Mile 13 7 2020 2022 written by Brandon H. Key and published by . This book was released on 2022 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive resolution imaging sonars (ARIS) are used to produce inriver abundance estimates of Kenai River early- and late-run Chinook salmon Onchorhynchus tshawytscha and Kasilof River late-run Chinook salmon. These sonars can be used to produce inseason estimates of fish 75 cm mid eye to tail fork length (METF) or longer, and when used over the entire run, can be used in conjunction with test fish data to produce postseason abundance estimates of all Chinook salmon regardless of size. Sonar estimates of Chinook salmon inriver passage provide the basis for estimating spawning escapement and implementing management plans that regulate harvest in the competing fisheries for these stocks.
Download or read book Kenai and Kasilof River Sockeye Salmon Inriver Passage and Escapement Studies 2022 2024 written by William J. Glick and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency Identification Sonar (DIDSON; Belcher et al. 2002) is used annually to estimate sockeye salmon Oncorhynchus nerka passage into the Kenai River of Upper Cook Inlet (UCI), Alaska (Figure 1). Adaptive Resolution Imaging Sonar (ARIS) is used to estimate sockeye salmon passage into the Kasilof River. Both multi-beam sonar systems are manufactured by Sound Metrics Corporation with ARIS being an upgraded replacement of the DIDSON. Sonar passage estimates of sockeye salmon are used for inseason management of UCI commercial fisheries, as well as personal use fisheries in the Kenai and Kasilof rivers, to achieve established escapement goals and inriver run goals. The current sustainable escapement goal (SEG) for sockeye salmon in the Kenai River is 750,000–1,300,000 fish. The inriver goal for sockeye salmon in the Kenai River is 1,000,000–1,200,000 fish if the forecasted return estimate is 2,300,000; 1,100,000–1,400,000 fish for a forecasted return of 2,300,000–4,600,000; and 1,200,000–1,600,000 fish for a forecasted return of 4,600,000 (Marston and Frothingham In prep). The Kasilof River optimal escapement goal (OEG) is 140,000–370,000 sockeye salmon, with a biological escapement goal (BEG) of 140,000–320,000. (McKinley et al. 2020). Fish wheels are used to capture migrating salmon for 1) species apportionment; 2) to estimate age, length, and sex composition of the sockeye salmon escapement; and, 3) to collect genetic samples as needed. Historical sonar passage and escapement data for the Kenai and Kasilof rivers (Table 1) is provided in yearly Regional Information and Fishery Data Series reports as exhibited by Glick and Marston (In prep). This plan outlines how sonar sampling and logistical operations will be conducted for each of these sonar enumeration sites.
Download or read book Current Research Profile for Alaska written by and published by . This book was released on 1973* with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kenai River Drift Gillnetting Pilot Study at River Mile 19 2021 written by Robert N. Begich and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In August 2021, we investigated the feasibility of using drift gillnets at river mile (RM) 19 to examine the species composition and spatial distribution of salmon migrating past the Division of Commercial Fisheries sonar site. Currently, the site uses dual-frequency identification sonar (DIDSON) to estimate sockeye salmon (Oncorhynchus nerka) passage, and fish wheels are used to sample salmon for species composition and biological characteristics. Drift gillnetting was conducted for 6 days during August 5–24, 2021 using 9.1 m length gillnets consisting of 1 of 3 mesh sizes: 4 in, 4.75in, or 5 in (10.2, 12.1, and 12.7 cm, respectively). Gillnetting occurred in 6 areas (0–10 m, 10–20 m, and 20–30 m) off each river bank, representing the area of the river where sonar data are collected to estimate passage of migrating sockeye salmon (sonar zones) and in 2 areas 0–10 m downstream of the fish wheel located on each river bank (fish wheel zones). Sockeye salmon composed the majority of the catch in both fish wheel and nearshore sonar zones. Sockeye salmon proportions declined offshore (>10 m) and during later sampling dates. Our results show that drift gillnets of various mesh sizes can be employed to capture migrating salmon at the Kenai River RM 19 sonar site. We present recommendations for future study designs.
Download or read book Annual Report written by Alaska. Department of Fish and Game and published by . This book was released on 1976 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
