Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2004 written by Malcolm S. McEwen and published by . This book was released on 2005 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Chum Salmon Passage in the Aniak River 2002 written by Malcolm S. McEwen and published by . This book was released on 2006 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Aniak River sonar project provided daily estimates of fish passage from 26 June through 31 July, 2002. User-configurable sonar continuously sampled the entire width of the river between the transducers, except for short periods when equipment was moved or serviced. An estimated 362,812 fish passed through the ensonified area during the period of operation. The peak daily passage of 18,532 fish occurred on 17 July, and the 50% passage date occurred on 13 July. Age-0.4 and-0.5 chum salmon Oncorhynchus keta comprised an estimated 77% and 20% of the escapement estimate, respectively. A total of 2,939 fish, 85% of which were chum salmon, were captured at the site during a total of 662 drifts with gillnets.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2005 written by Malcolm S. McEwen and published by . This book was released on 2007 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of the Aniak River sonar project, which provided daily estimates of chum salmon passage from June 23-July 31, 2005.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2009 written by Malcolm S. McEwen and published by . This book was released on 2010 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 26 through July 31, 2009.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2006 written by Malcolm S. McEwen and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 28 through July 31, 2006.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2011 written by Malcolm S. McEwen and published by . This book was released on 2015 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 26 through July 31, 2011.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2010 written by Malcolm S. McEwen and published by . This book was released on 2013 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 26 through July 31, 2010.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2008 written by Malcolm S. McEwen and published by . This book was released on 2010 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 26 through July 31, 2008.

Download or read book Sonar Estimation of Chum Salmon Passage in the Aniak River 2007 written by Malcolm S. McEwen and published by . This book was released on 2009 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reports the results of the Aniak River sonar project, which utilized high frequency imaging sonar (DIDSON) and provided daily estimates of chum salmon passage from June 24 through July 31, 2007.

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.

Download or read book Estimation of Aniak River Chum Salmon Passage in 2001 Using Hydroacoustic Methodologies written by Douglas W. Lieb and published by . This book was released on 2002 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sonar Estimation of Summer Chum Salmon Passage in the Anvik River Alaska 2015 written by Jody D. Lozori and published by . This book was released on 2016 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dual-frequency identification sonar (DIDSON) was used to estimate summer chum salmon Oncorhynchus keta passage in the Anvik River from June 17 to July 27, 2015. A total of 374,968 summer chum salmon were estimated to have passed the sonar site. A beach seine sample fishery was conducted to collect age, sex, and length (ASL) and genetic information. Both systems functioned well with minimal interruptions to operation. The range of ensonification was considered adequate for most fish that migrated upstream.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2020 written by Michael J. McDougall and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive resolution imaging sonar (ARIS) and split-beam sonar equipment were used to estimate Chinook salmon Oncorhynchus tshawytscha and fall chum salmon O. keta passage in the Yukon River near Eagle, Alaska, from July 1 through October 6, 2020. A total of 33,550 (SE 219) Chinook salmon were estimated to have passed the sonar site from July 1 through August 27. The midpoint of the Chinook salmon migration occurred on July 29, which was 5 days later than the historical mean date. A total of 20,766 (SE 177) fall chum salmon were estimated to have passed the sonar site from August 28 through October 6. The fall chum salmon passage estimate was subsequently expanded to a total of 23,512 to include fish that may have passed after operations ceased. The midpoint of the fall chum salmon migration (based on the expanded estimate) occurred on September 24, which was 1 day later than the historical mean date. Drift gillnetting was conducted to collect age, sex, and length samples and tissue samples for genetic information. Species composition was analyzed to determine when the Chinook salmon migration ended and the fall chum salmon migration began.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2017 written by Michael J. McDougall and published by . This book was released on 2018 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive resolution imaging sonar (ARIS) and split-beam sonar equipment were used to estimate Chinook salmon Oncorhynchus tshawytscha and fall chum salmon O. keta passage in the Yukon River near Eagle, Alaska from July 1 to October 6, 2017. A total of 73,313 (SE 373) Chinook salmon were estimated to have passed the sonar site between July 1 and August 20. The midpoint of the Chinook salmon run occurred on July 22, which was 2 days early relative to the historical mean date. An estimated 407,166 (SE 1,566) fall chum salmon passed between August 21 and October 6. The sonar-estimated passage of fall chum salmon was subsequently expanded to a total passage estimate of 419,099 to include fish that may have passed after operations ceased. The midpoint of the expanded fall chum salmon estimate occurred on September 21, which was 2 days earlier than the historical mean date. Subtracting the preliminary subsistence catch upstream of the sonar site resulted in an estimated border passage of 71,815 Chinook salmon and 404,989 fall chum salmon. Drift gillnetting was conducted to collect age, sex, and length samples and tissue samples for genetic information. Species composition was also recorded to determine when the Chinook salmon run ended and the fall chum salmon run began.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2021 written by Naomi B. Brodersen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive resolution imaging sonar (ARIS) and split-beam sonar equipment were used to estimate Chinook salmon Oncorhynchus tshawytscha and fall chum salmon O. keta passage in the Yukon River near Eagle, Alaska, from June 28 through October 6, 2021. A total of 31,796 (SE 207) Chinook salmon were estimated to have passed the sonar site from June 28 through August 31. The midpoint of the Chinook salmon migration occurred on July 29, which was 5 days later than the historical mean date. A total of 19,668 (SE 243) fall chum salmon were estimated to have passed the sonar site from September 1 through October 6. The fall chum salmon passage estimate was subsequently expanded to a total of 23,170 to include fish that may have passed after operations ceased. The midpoint of the fall chum salmon migration (based on the expanded estimate) occurred on September 27, which was 4 days later than the historical mean date. Drift gillnetting was conducted to collect age, sex, and length samples and tissue samples for genetic information. Species composition was analyzed to determine when the Chinook salmon migration ended and the fall chum salmon migration began.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2019 written by Michael J. McDougall and published by . This book was released on 2020 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive resolution imaging sonar (ARIS) and split-beam sonar equipment were used to estimate Chinook salmon Oncorhynchus tshawytscha and fall chum salmon O. keta passage in the Yukon River near Eagle, Alaska from July 1 through October 6, 2019. A total of 45,560 (SE = 274) Chinook salmon were estimated to have passed the sonar site from July 1 through August 14. The midpoint of the Chinook salmon migration occurred on July 26, which was 2 days later than the historical mean date. A total of 101,678 (SE = 544) fall chum salmon were estimated to have passed the sonar site from August 15 through October 6. The fall chum salmon passage estimate was subsequently expanded to a total of 113,256 to include fish that may have passed after operations ceased. The midpoint of the fall chum salmon migration (based on the expanded estimate) occurred on September 25, which was 2 days later than the historical mean date. Drift gillnetting was conducted to collect age, sex, and length samples and tissue samples for genetic information. Species composition was analyzed to determine when the Chinook salmon migration ended, and the fall chum salmon migration began.