Author: Allison N. Matter Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 62
Book Description
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.
Author: Lisa Ann Stuby Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 64
Book Description
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.
Author: Allison N. Matter Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 0
Book Description
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.
Author: Lisa Ann Stuby Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 51
Book Description
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.
Author: James William Savereide Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 48
Book Description
This report summarizes the 2011-2012 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.
Author: James William Savereide Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 41
Book Description
This report summarizes the 2013 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.
Author: Audra Lee Janiak Brase Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 58
Book Description
This report summarizes the 2006 results from the Chinook and coho salmon counting tower projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.
Author: James William Savereide Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 54
Book Description
This report summarizes the 2007-2009 results from the Chinook and coho salmon counting projects on the Chena, Delta Clearwater, Goodpaster and Salcha Rivers.
Author: Daryl Lescanec Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 35
Book Description
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).
Author: Samuel S. Ivey Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 103
Book Description
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.
Author: Allison N. Matter
Author: Lisa Ann Stuby
Author: Allison N. Matter
Author: Lisa Ann Stuby
Author: James William Savereide
Author: James William Savereide
Author: Audra Lee Janiak Brase
Author: James William Savereide
Author: Daryl Lescanec
Author: Samuel S. Ivey