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 Estimation of Yukon River Salmon Passage in 2001 Using Hydroacoustic Methodologies written by Carl Thomas Pfisterer and published by . This book was released on 2002 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Daily passage estimates for chinook salmon (Oncorhynchus tshawytscha) and summer and fall chum salmon (Oncorhynchus keta) are provided for the corresponding 2001 Yukon River escapement. A two component process was utilized: estimation of total fish passage via a single-beam sonar at the confluence of the Yukon and Atchuelinguk rivers, and estimation of species proportions by sampling with a series of gillnets near the same (Pilot Station) site.

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 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 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 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 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 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 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 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 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 Evaluation of Hydroacoustic Site on the Yukon River Near Eagle Alaska for Monitoring Passage of Salmon Across the US Canada Border 2004 written by Holly C. Carroll and published by . This book was released on 2007 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 2-week study was undertaken from August 18 to August 30, 2004, to locate an appropriate site to deploy sonar for use in a long-term enumeration study of chinook salmon, Oncorhynchus tshawytscha, and fall chum salmon, O. keta, on the Yukon River near the Alaska/Canada border. Dual-Frequency Identification Sonar (DIDSONTM) and split-beam sonar equipment were tested at Calico Bluff and Six-Mile Bend, both sites within 12 miles of Eagle, Alaska. Bottom profiles were produced for the two potential sites and despite technical malfunctions with the split-beam equipment, which rendered x-y position information unusable, two suitable sonar deployment locations were found. Both split-beam and DIDSONTM systems have their strengths, and by using the DIDSONTM on a relatively steep, short cobble shore (where fish tend to be distributed inshore), and the split-beam on a long, gentle sloping bank, acoustic coverage of the river should be sufficient for fish enumeration. Six-Mile Bend was the most suitable location for a future sonar project because of its linear left-bank, stable cobble substrate, single channel and proximity to the Alaska/Canada Border. Sonar will need to be deployed on the right bank at Six-Mile Bend in future seasons. A long-term enumeration project for chinook and chum salmon near the border will provide information to help fishery managers meet conservation and management commitments made by the U.S. and Canada under the Yukon River Salmon Agreement.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2010 written by Ann B. Crane and published by . This book was released on 2011 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reports on the results of using the Dual-Frequency Identification Sonar (DIDSON) and split-beam sonar equipment, which were used to estimate Chinook salmon, Oncorhynchus tshawytscha, and fall chum salmon, Oncorhynchus keta, passage in the Yukon River near Eagle, Alaska from July 3 to October 6, 2010. This continued long-term hydroacoustic enumeration project for Chinook and chum salmon near the United States/Canada border will help fishery managers meet conservation and management commitments made by both countries under the Yukon River Salmon Agreement.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2009 written by Ann B. Crane and published by . This book was released on 2011 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reports on the results of using the Dual-Frequency Identification Sonar (DIDSON) and split-beam sonar equipment, which were used to estimate Chinook salmon, Oncorhynchus tshawytscha, and fall chum salmon, Oncorhynchus keta, passage in the Yukon River near Eagle, Alaska from July 5 to October 6, 2009. This continued long-term hydroacoustic enumeration project for Chinook and chum salmon near the United States/Canada border will help fishery managers meet conservation and management commitments made by both countries under the Yukon River Salmon Agreement.

Download or read book Sonar Estimation of Chinook and Fall Chum Salmon Passage in the Yukon River Near Eagle Alaska 2011 written by Elizabeth A. Smith and published by . This book was released on 2012 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reports on the results of using the Dual-Frequency Identification Sonar (DIDSON) and split-beam sonar equipment, which were used to estimate Chinook salmon, Oncorhynchus tshawytscha, and fall chum salmon, Oncorhynchus keta, passage in the Yukon River near Eagle, Alaska from July 5 to October 6, 2011. This continued long-term hydroacoustic enumeration project for Chinook and chum salmon near the United States/Canada border will help fishery managers meet conservation and management commitments made by both countries under the Yukon River Salmon Agreement.

Download or read book Aniak River Sonar Project Report 1999 written by Lowell Fair and published by . This book was released on 2000 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Aniak River sonar project provided daily estimates of fish passage from July 1 through August 3, 1999. 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 177,771 fish passed through the ensonified area during the period of operation. The peak daily passage of 10,613 fish occurred on July 25, and the 50% passage date occurred on July 20. The four and five-year age classes of Aniak River chum salmon comprised an estimated 59.6% and 38.9% of the escapement estimate respectively.