Download or read book Evaulating Error in Sockeye Salmon Abundance Estimates from Salmon Migrating Outside the Sonar Beam at the Yentna Cooper and Kenai Rivers written by Suzanne L. Maxwell and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonars (DIDSONs) are used at several sites in Alaska to assess Pacific salmon Oncorhynchys spp. escapement. This study examined one potential error source associated with this method, the number of fish migrating outside the ensonified region.

Download or read book Evaulating Error in Sockeye Salmon Abundance Estimates from Salmon Migrating Outside the Sonar Beam at the Yentna Cooper and Kenai Rivers written by Suzanne L. Maxwell and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency identification sonars (DIDSONs) are used at several sites in Alaska to assess Pacific salmon Oncorhynchys spp. escapement. This study examined one potential error source associated with this method, the number of fish migrating outside the ensonified region.

Download or read book Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2013 written by Aaron Dupuis and published by . This book was released on 2015 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the 2013 Upper Cook Inlet (UCI) commercial salmon fishing season, 2 offshore test fisheries (OTF) were conducted using drift gillnets. The southern OTF originates on the east side of Cook Inlet near Anchor Point and has been operational since 1979. Its objective is to assess the size and timing of the sockeye salmon Oncorhynchus nerka run entering UCI, including the Kenai River, during the commercial salmon fishing season. In 2013, the southern OTF occurred from 1 July through 30 July and captured 2,020 sockeye salmon representing 1,342 catch per unit of effort index points. Due to adverse weather conditions and mechanical difficulties 1 or more stations were not fished during 8 days and no fishing occurred on 3 days. Most of the missed stations occurred near the traditional peak of the sockeye salmon run. Because of the timing and relatively high number of missed stations, no formal inseason estimates of the size and timing of the 2013 sockeye salmon run were made using OTF data. A mixed stock analysis using genetic data (MSA) was performed on samples collected during the test fishery, which showed similar stock compositions to previous years. A second UCI northern test fishery, which began in 2012, was continued in 2013 to assess the potential of spatial and temporal separation of Susitna River sockeye salmon migrating through Cook Inlet using MSA. The northern OTF is located in the northern area of the Central District with the transect running across UCI from the Blanchard Line to the Drift River. In 2013, the northern OTF operated from July 1 through July 30 and captured 3,333 sockeye salmon. In 2013, the MSA sampling for both OTF projects were expanded to include all coho salmon O. kisutch captured to identify spatial and temporal stock compositions of the harvest.

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 Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2016 written by Aaron Wayne Dupuis and published by . This book was released on 2018 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2016, the southern offshore test fishery (OTF) conducted from July 1 through July 29 captured 2,155 sockeye salmon Oncorhynchus nerka, which represented 1,792 catch per unit of effort (CPUE) index points. The midpoint of the 2016 sockeye salmon run at the southern OTF occurred on July 18. A formal inseason estimate of the 2016 run size was made on July 25 and this analysis predicted a total run to Upper Cook Inlet (UCI) of 6.83 million sockeye salmon. The best-fit total run estimate deviated from the estimated total run of 5.11 million fish by 33.7%. An inseason estimate was also made for the Kenai River sockeye salmon run on July 25 and this analysis predicted a total run to the Kenai River range of 3.53-5.57 million fish. Sockeye salmon and coho salmon O. kisutch genetic samples were collected and archived for future analysis.

Download or read book Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2019 written by Alyssa Frothingham and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2019, the southern offshore test fishery was conducted from July 1 to July 30 and captured 1,859 sockeye salmon representing 1,476 CPUE index points, adjusted to 1,931 CPUE postseason. The midpoint of the 2019 sockeye salmon run at the southern offshore test fishery occurred on July 21. A formal inseason estimate of the 2019 run size was made on July 26; this analysis predicted a total run to Upper Cook Inlet of 6.1 million sockeye salmon. The best-fit total run estimate deviated from the estimated total run of 5.2 million fish by 15.9%. An inseason estimate was also made for the Kenai River sockeye salmon run on July 26; the July 26 analysis predicted a total run to the Kenai River ranging between 2.2 and 4.0 million fish. A postseason analysis estimated the 2019 Kenai River total sockeye salmon run to be approximately 3.6 million fish. Finally, sockeye salmon and coho salmon genetic samples were collected and archived for future analysis.

Download or read book Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2017 written by Alyssa Frothingham and published by . This book was released on 2018 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2017, the southern offshore test fishery (OTF) conducted from July 1 through July 31 captured 2,586 sockeye salmon Oncorhynchus nerka, which represented 2,194 catch per unit of effort (CPUE) index points. The midpoint of the 2017 sockeye salmon run at the southern OTF occurred on July 20. A formal inseason estimate of the 2017 run size was made on July 24 and this analysis predicted a total run to Upper Cook Inlet (UCI) of 7.11 million sockeye salmon. Therefore, the first best-fit total run estimate from the formal inseason projection of the 2017 run was approximately 54.2% higher than the actual run size. An inseason estimate was also made for the Kenai River sockeye salmon run on July 24; the July 24 analysis predicted a total run to the Kenai River that range of 1.6-4.3 million fish. Sockeye salmon and coho salmon O. kisutch genetic samples were collected from the OTF and archived for future analysis.

Download or read book Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2015 written by Aaron Dupuis and published by . This book was released on 2016 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2015, the southern offshore test fishery (OTF) was conducted from July 1 through July 30 and captured 2,378 sockeye salmon Oncorhynchus nerka representing 1,609 catch per unit of effort (CPUE) index points. The midpoint of the 2015 sockeye salmon run at the southern OTF occurred on 25 July. A formal inseason estimate of the 2015 run size was made on July 27; this analysis predicted a total run to Upper Cook Inlet (UCI) of 5.9 million sockeye salmon. The best-fit total run estimate deviated from the estimated total run of 6.30 million fish by 6.5%. An inseason estimate was also made for the Kenai River sockeye salmon run on July 27; the July 27 analysis predicted a total run to the Kenai River ranging between 2.20 and 3.53 million fish. The best-fit Kenai River total run estimate from this analysis (3.53 million fish) differed from the estimated total run of 3.89 million fish by 9.3%. A mixed stock analysis using genetic data (MSA) was performed on samples collected during the test fishery, which showed similar stock compositions to previous years. The MSA sampling for the OTF project was included all coho salmon O. kisutch captured to estimate spatial and temporal stock compositions of the harvest.

Download or read book Migratory Timing and Abundance Estimates of Sockeye Salmon Into Upper Cook Inlet Alaska 2014 written by Aaron Dupuis and published by . This book was released on 2016 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two offshore test fisheries (OTF) operated during the 2014 Upper Cook Inlet (UCI) commercial salmon fishing season. In 2014, the southern OTF was conducted from 1 July through 1 August and captured 3,366 sockeye salmon Oncorhynchus nerka representing 2,505 catch per unit of effort (CPUE) index points. The midpoint of the 2014 sockeye salmon run at the southern OTF occurred on 16 July. Two formal inseason estimates of the 2014 run size were made on 21 and 23 July; the 23 July analysis predicted a total run to UCI of 5.8 to 9.1 million sockeye salmon. The best-fit total run estimate deviated from the actual total run of 5.28 million fish by 72%. Two inseason estimates were made for the Kenai River sockeye salmon run on 21 and 23 July; the 23 July analysis predicted a total run to the Kenai River ranging between 2.67 and 5.65 million fish. The best-fit Kenai River total run estimate from this analysis (5.65 million fish) differed from the actual total run of 3.28 million fish by 72%. A mixed stock analysis using genetic data (MSA) was performed on samples collected during the test fishery, which showed similar stock compositions to previous years. The northern OTF stations were modified in 2014 to consist of 2 transects running across UCI from the Blanchard Line to the north end of Kalgin Island and from the south end of Kalgin Island back to the Kenai Peninsula. In 2014, the northern OTF operated from July 1 through July 30 and captured 2,362 sockeye salmon. In 2014, the MSA sampling for both OTF projects was expanded to include all coho salmon O. kisutch captured to estimate spatial and temporal stock compositions of the harvest.

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 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 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 Upper Cook Inlet Sockeye Salmon Escapement Studies 2014 written by William J. Glick and published by . This book was released on 2016 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2014, the Alaska Department of Fish and Game used dual-frequency identification sonar to estimate an escapement of 1,520,340 (95% CI: 1,494,105-1,546,575) sockeye salmon (Oncorhynchus nerka) into the Kenai River, 440,192 (95% CI: 438,380-442,003) into the Kasilof River, and 55,759-137,256 into the Yentna River. Escapement estimates for the Kenai River were adjusted postseason relating to an overlap of sockeye and pink salmon. An escapement range for the Yentna River was estimated postseason for sockeye, pink (O. gorbuscha), chum (O. keta), and coho (O. kisutch) salmon from 6 sets of fish wheel selectivity indices obtained from the literature. The predominant age classes for sockeye salmon in the Kenai River were 1.2 (12.3%), 1.3 (63.5%), 2.2 (7.2%), and 2.3 (15.3%); Kasilof River 1.2 (42.4%), 1.3 (29.4%), and 2.2 (20.6%); Yentna River 1.2 (39.4%), 1.3 (33.3%), 2.2 (12.4%) and 2.3 (10.2%). Length and sex ratio information were also collected for sockeye salmon at each river. Results of escapement projects conducted by other agencies and organizations are also briefly mentioned in this report.

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 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 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.