Download or read book Chinook Salmon Escapement in the Chena and Salcha Rivers and Coho Salmon Escapement in the Delta Clearwater River 2016 written by Lisa Ann Stuby and published by . This book was released on 2018 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: During 2016 the Alaska Department of Fish and Game conducted salmon enumeration projects on the Chena, Salcha, and Delta Clearwater rivers in the Tanana River drainage. Chinook salmon Oncorhynchus tshawytscha escapements for the Chena and Salcha rivers were estimated using tower-counting techniques with the addition of sonar (DIDSON and ARIS) methodology as a secondary means of enumeration when high-water events precluded visual counts. A Bayesian mixture model was used to apportion species from the sonar files. Coho salmon Oncorhynchus kisutch escapement in the Delta Clearwater River was estimated by a visual boat survey at peak escapement. The counting towers operated on 26 June for the Chena River and 26 June-3 July and 11-17 July for the Salcha River until high, muddy water precluded visual counts. Sonars could not be operated due to flooding from 19 July-5 August for the Chena River and during 19-26 July and 31 July-5 August for the Salcha River. A Bayesian hierarchical model was used to estimate salmon abundance for days when the sonars were not operating. Estimated Chinook salmon escapement for the Chena River was 6,665 (SE = 363) and 2,675 (SE = 313) for the Salcha River. Due to flooding and sonar placement, the abundance estimate for the Salcha River represents a minimum. During the carcass surveys 388 and 503 Chinook salmon were collected from the Chena and Salcha rivers respectively to estimate the age, sex, and length composition of the escapement. Dominant age classes were age 1.2 (0.43) for males and age 1.3 (0.14) for females for the Chena River and 1.2 (0.37) for males and age 1.3 (0.17) for females for the Salcha River. Estimated proportion of females was 0.22 (SE = 0.02) and the proportion adjusted for gender-bias was 0.16 (SE = 0.03) for the Chena River and 0.38 (SE = 0.02) and gender-bias adjusted was 0.33 (SE = 0.07) for the Salcha River. Mean length of females in the Chena River escapement was 771 mm and 629 mm for males and the mean length of females in the Salcha River escapement was 746 mm and 631 mm for males. Chum salmon Oncorhynchus keta escapement for the Chena and Salcha rivers was 6,493 (SE = 427) and 2,897 (SE = 177), respectively. Because counting operations ceased during the chum run, these counts were considered incomplete. The peak escapement count of coho salmon escapement in the Delta Clearwater River on 26 October was 6,767.

Download or read book Chinook Salmon Escapement in the Chena and Salcha Rivers and Coho Salmon Escapement in the Delta Clearwater River 2017 written by Allison N. Matter and published by . This book was released on 2020 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: During 2017, Alaska Department of Fish and Game conducted salmon enumeration projects on the Chena, Salcha, and Delta Clearwater Rivers in the Tanana River drainage. Chinook salmon Oncorhynchus tshawytscha escapements for the Chena and Salcha Rivers were estimated using tower-counting techniques with the addition of sonar (DIDSON and ARIS) methodology as a secondary means of enumeration when events precluded visual counts. A Bayesian mixture model was used to apportion species from the sonar files. The Chena River counting tower and sonars operated from 26 June-3 August and the final escapement estimate was 5,235 (SE = 321) Chinook salmon. The adjusted sex composition was 0.67 (SE = 0.03) male and 0.33 (SE = 0.03) female (n = 420). The dominant age class was 1.3 for both males (28% of total sample) and females (46% of total sample). The Salcha River counting tower and sonars operated from 27 June-4 August and the final escapement estimate was 4,195 (SE = 205) Chinook salmon. The adjusted sex composition was 0.65 (SE = 0.07) male and 0.35 (SE = 0.07) female (n = 504). Like the Chena River, the dominant age class was 1.3 for both males (49% of total sample) and females (23% of total sample). Incomplete chum salmon Oncorhynchus keta escapement for the Chena and Salcha Rivers was estimated to be 21,176 (SE = 994) and 20,093 (SE = 1,220), respectively. Coho salmon Oncorhynchus kisutch escapement in the Delta Clearwater River was estimated as 9,617 fish by a visual boat survey at peak escapement on 26 October.

Download or read book Chinook Salmon Escapement in the Chena and Salcha Rivers and Coho Salmon Escapement in the Delta Clearwater River 2018 written by Allison N. Matter and published by . This book was released on 2020 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: During 2018, the Alaska Department of Fish and Game conducted salmon enumeration projects on the Chena, Salcha, and Delta Clearwater Rivers in the Tanana River drainage. Chinook salmon Oncorhynchus tshawytscha escapements for the Chena and Salcha Rivers were estimated using tower-counting techniques with the addition of sonar (DIDSON and ARIS) apportionment, interpolation, and a Bayesian hierarchical model as a means of enumeration when high-water events precluded visual counts. The Chena River counting tower and sonars operated from 27 June until 10 August, and the final escapement estimate was 5,947 (SE = 226) Chinook salmon. The adjusted sex composition was 0.63 (SE = 0.07) male and 0.37 (SE = 0.07) female (n = 348). The dominant age class was 1.3 for males (41% of total escapement) and 1.4 for females (28% of total escapement). The Salcha River counting tower and sonars operated from 27 June until 10 August and the final escapement estimate was 4,195 (SE = 205) Chinook salmon. The adjusted sex composition was 0.65 (SE = 0.07) male and 0.35 (SE = 0.07) female (n=504). Like the Chena River, the dominant age class was 1.3 for males (31% of total escapement) and 1.4 for females (35% of total escapement). Incomplete chum salmon Oncorhynchus keta escapements for the Chena and Salcha Rivers were estimated to be 13,084 (SE = 1705) and 39,996 (SE = 8,095), respectively. Coho salmon Oncorhynchus kisutch escapement in the Delta Clearwater River was estimated as 2,884 fish by a visual boat survey at peak escapement on 7 November.

Download or read book Chinook Salmon Escapement in the Chena Salcha and Goodpaster Rivers and Coho Salmon Escapement in the Delta Clearwater River 2014 written by James William Savereide and published by . This book was released on 2018 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2014, salmon enumeration projects in the Tanana River drainage were conducted by the Alaska Department of Fish and Game (ADF&G) on the Chena and Delta Clearwater rivers. Enumeration projects on the Salcha and Goodpaster rivers were conducted by Bering Sea Fishermen's Association (BSFA) and Tanana Chiefs Corporation (TCC), respectively. Chinook salmon Oncorhynchus tshawytscha escapements for the Chena, Salcha, and Goodpaster rivers were estimated, or attempted to be estimated, using tower-counting techniques and coho salmon O. kisutch escapement in the Delta Clearwater River was estimated by visual boat survey at peak escapement. Sonar methodology was also used on the Chena River. This report details work conducted by ADF&G on the Chena and Delta Clearwater rivers and serves as an archive for count data collected on the Salcha and Goodpaster rivers.

Download or read book Chinook Salmon Escapement in the Chena Salcha and Goodpaster Rivers and Coho Salmon Escapement in the Delta Clearwater River 2015 written by Lisa Ann Stuby and published by . This book was released on 2016 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: During 2015 the Alaska Department of Fish and Game (ADF&G) conducted salmon enumeration projects on the Chena and Delta Clearwater rivers in the Tanana River drainage. Enumeration projects on the Salcha and Goodpaster rivers were conducted by Bering Sea Fishermen's Association and Tanana Chiefs Conference, respectively, of which this report serves as an archive. Chinook salmon Oncorhynchus tshawytscha escapements for the Salcha and Goodpaster rivers were estimated using tower-counting techniques and similarly for the Chena River with the addition of dual-frequency identification sonar (DIDSON) methodology to account for days missed due to high water. Coho salmon O. kisutch escapement in the Delta Clearwater River was estimated by a visual boat survey at peak escapement. Counting towers on the Chena, Salcha, and Goodpaster rivers operated from 30 June until 6 August, 12 July until 9 August, and 9 to 30 July, respectively. High, muddy water due to inclement weather precluded acquiring counts during 3-7, 21-25, and 28 July, and 1-6 August for the Chena River, and 1-11 July for the Salcha River. Estimated Chinook salmon escapement for the Chena River was 6,291 (SE=169). Five-hundred ninety one Chinook salmon were collected during the carcass survey to estimate the age, sex, and length composition of the escapement. Dominant age classes were age 1.2 (44%) for males and age 1.4 (87%) for females. Estimated proportion of females was 0.55 (SE=0.02) and the proportion adjusted for gender-bias was 0.39 (SE=0.07). Mean length of females in the Chena River escapement was 809 mm and mean length of males was 674 mm. Chum salmon escapement for the Chena River was 8,620 (SE=153) and because counting operations ceased during the chum run, is considered incomplete. The peak escapement count of coho salmon escapement in the Delta Clearwater River on 22 October was 19,553. Chinook salmon escapement for the Salcha River was 6,879 (SE=1,617) and 2,353 (SE=97) for the Goodpaster River.

Download or read book Chinook Salmon Escapement in the Chena Salcha and Goodpaster Rivers and Coho Salmon Escapement in the Delta Clearwater River 2011 2012 written by James William Savereide and published by . This book was released on 2014 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2011-2012 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.

Download or read book Chinook Salmon Escapement in the Chena Salcha and Goodpaster Rivers and Coho Salmon Escapement in the Delta Clearwater River 2013 written by James William Savereide and published by . This book was released on 2014 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2013 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.

Download or read book Chinook and Coho Salmon Escapement in the Chena Delta Clearwater Goodpaster and Salcha Rivers 2010 written by James William Savereide and published by . This book was released on 2012 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2010 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.

Download or read book Chinook and Coho Salmon Escapement in the Chena Delta Clearwater Goodpaster and Salcha Rivers 2006 written by Audra Lee Janiak Brase and published by . This book was released on 2012 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2006 results from the Chinook and coho salmon counting tower projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.

Download or read book Salmon Studies in the Chena Delta Clearwater Goodpaster and Salcha Rivers 2007 2009 written by James William Savereide and published by . This book was released on 2012 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2007-2009 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.

Download or read book Salmon Studies in the Chena Chatanika Delta Clearwater and Salcha Rivers 2004 and 2005 written by Audra Lee Janiak Brase and published by . This book was released on 2006 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the 2004 and 2005 results from the Chinook salmon counting tower projects on the Chena, Chatanika, and Salcha rivers, and the coho enumeration project on the Delta Clearwater River.

Download or read book Little Susitna River Chinook and Coho Salmon Escapement Studies 2012 2016 written by Daryl Lescanec and published by . This book was released on 2020 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) annual escapements to the Little Susitna River were assessed from 2012 to 2016 to provide escapement counts and stock-specific biological information. Both Chinook and coho salmon were counted at a weir operated from approximately late May through mid-September each year. Not all counts were complete for each run. Complete weir counts for Chinook salmon from 2014 through 2016 ranged between 3,135 and 5,026 fish. For 2013-2016, age composition for Chinook salmon averaged 38.1% age-1.2 fish, 37.1% age-1.3 fish, and 13.6% age-1.4 fish. On average, females composed 35.5% of the runs. The midpoint of the Chinook salmon runs with complete counts varied between years from 11 to 23 June. Chinook salmon escapement goals were met for the years 2013-2016. The 2012, 2014, and 2016 mean annual coho salmon weir count was 13,680 fish. An above-average coho salmon run was observed in 2014, whereas 2012 was the lowest count recorded since the weir was first operated in 1995. High water and a flood precluded complete coho salmon weir counts 2 of the 5 years. The midpoint of the coho salmon runs varied between years with complete counts from 10 to 21 August.

Download or read book Chinook Salmon Escapement and Run Timing in the Gulkana River 2016 2018 written by Corey J. Schwanke and published by . This book was released on 2019 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Counting tower techniques were used to estimate Chinook salmon Oncorhynchus tshawytscha escapement in the Gulkana River during 2016, 2017, and 2018. The counting tower was located in the mainstem Gulkana River about 3.25 rkm upstream of the West Fork Gulkana River confluence. The estimated escapement of Chinook salmon was 1,122 (SE = 166; 95% CI = 796-1,447) in 2016, 3,336 (SE = 309; 95% CI = 2,730-3,942) in 2017, and 5,174 (SE = 344; 95% CI = 4,499-5,848) in 2018. These numbers do not represent total inriver escapement, just passage above the counting tower site. The 2016 estimated escapement of Chinook salmon was the lowest since the inception of the project in 2002, whereas the 2018 estimated escapement was the 2nd highest on record and had the latest run timing. The dates of 25th, 50th, and 75th percentile passage of Chinook salmon have been getting later since the project's inception in 2002. The estimated escapement of sockeye salmon O. nerka during the counting tower's operational period was 26,010 (SE = 1,157; 95% CI = 23,743-28,277) in 2016, 20,492 (SE = 927; 95% CI = 18,675-22,309) in 2017, and 12,436 (SE = 540; 95% CI = 11,377-13,494) in 2018. The partial sockeye salmon escapement estimate in 2018 was the 2nd lowest since the inception of this project in 2002.

Download or read book Deshka River Chinook and Coho Salmon Escapement Studies 1995 2004 written by Samuel S. Ivey and published by . This book was released on 2014 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) escapements to the Deshka River were assessed from 1995-2004 to provide escapement counts and stock-specific biological information.

Download or read book Population Estimate of Chinook Salmon Escapement in the Chena River in 1986 Based Upon Mark and Recapture Techniques written by Louis H. Barton and published by . This book was released on 1987 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Deshka River Chinook and Coho Salmon Escapement Studies 2005 2014 written by Daryl Lescanec and published by . This book was released on 2017 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) annual escapements to the Deshka River were assessed from 2005 to 2014 to provide escapement counts and stock-specific biological information. Both Chinook and coho salmon were counted at a weir operated from approximately late May through mid-September each year, except for 2006 when coho salmon were counted through 16 August. The mean annual Chinook salmon weir count was 19,366 fish. Age composition for Chinook salmon averaged 30.8% age-1.2 fish, 50.4 % age-1.3 fish, and 16.7% age-1.4 fish. On average, females composed 48.3% of the runs. Chinook salmon run timing was consistent until 2013 and then quite variable in the last 2 years. On average, 50% (SE 8.1%) of the fish passed upstream of the weir by 20 June. Chinook salmon escapement goals were met for the years 2005-2007 and 2010-2014. The 2005-2014 mean annual coho salmon weir count was 18,684 fish. Above average coho salmon runs were observed in 2005 and 2006, whereas 2012 was the lowest count recorded since the weir was first operated in 1995. High water and a flood precluded complete coho salmon weir counts 2 of the 10 years. Coho salmon run timing was inconsistent (SD = 8 days at mean 50th percentile).

Download or read book Unalakleet River Chinook Salmon Escapement Monitoring and Assessment 2016 written by Jenefer Bell and published by . This book was released on 2017 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Declining run sizes and ensuing state and federal restrictions and closures to Unalakleet River Chinook salmon Oncorhynchus tshawytscha fisheries highlighted the need to obtain more complete estimates of spawning escapement. In response, multiple agencies and entities began the Unalakleet River weir in 2010 funded by United States Fish and Wildlife Service's Office of Subsistence Management. The goal was to obtain estimates of the mainstem Chinook salmon escapement and age, sex, and length (ASL) composition. An estimated 505 Chinook salmon were enumerated during the 2016 season. High water and numerous pink salmon O. gorbuscha contributed to an incomplete count of Chinook salmon in 2016, therefore the escapement estimate should be considered a minimum count and run timing could not be determined. A total of 25 ASL samples were collected but did not meet minimum sample size requirements and could not be used to estimate female percentage or age composition. Despite issues with operations in 2016, the Unalakleet River weir is an important tool for fishery managers and increased oversight and training will ensure it remains a viable option for monitoring Chinook salmon in the Unalakleet River.