Assessment of Chinook, Chum, and Coho Salmon Escapements in the Holitna River Drainage Using Radiotelemetry, 2002 PDF Download
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Author: John Samuel Chythlook
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 38
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Book Description
Author: John Samuel Chythlook
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 38
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Author: Klaus G. Wuttig
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 42
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Author: Steven M. Stroka
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 62
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Author: Steven M. Stroka
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 42
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Book Description
Author: Gene J. Sandone
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 81
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After decades of using the DFO mark-recapture border program as the sole U.S./Canada border passage estimator oil the Yukon River, the cooperative ADF&G-NOAA drainage-wide radio telemetry project and ADF&G-DFO sonar projects provided independent estimates of border passage for 2002-2004 and 2005- 2007, respectively. Marked and variable differences between the annual DFO mark-recapture estimates and estimates derived from radio telemetry and sonar projects strongly suggests that the DFO mark- recapture estimate was biased low and a new sonar-based escapement goal was necessary. An exploratory analysis was initiated to reconstruct the historic drainage escapement database and make it compatible with new sonar-based escapement estimates. Analyses were conducted that ranged from simple scaling of historical data to more robust regression models. Seventeen escapement databases were created through these analyses. Ultimately, four escapement databases, reconstructed from drainage escapements derived from radio telemetry and sonar projects (2002-2007) and regressed against escapement indices, were considered viable candidates. A secondary goal of these analyses was to investigate potential escapement goal ranges based oil the viable escapement databases. Interestingly, all Sustainable Escapement Goal (SEG) ranges and Marcov Table analysis indicated similar escapement goals for all four reconstructed escapement database scenarios. Spawner-recruit statistics were also very similar. Therefore, two escapement goal recommendations were suggested: 1) Set a conservative escapement goal range that reflected all escapement database scenarios, 40,000 to 60,000 Chinook salmon, and 2) Do not select a reconstructed escapement database for the period 1982-2001, but build on the current escapement database derived from radio-telemetry estimates (2002-2004) and sonar counts (2005-present).
Author: Reed A. Duston
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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From January to July of 2002, 79 entrapments and 22 stranding sites were examined on the Columbia River near Ives Island, downstream of Bonneville Dam. A total of 2,272 salmonids, consisting of three different species, were collected at these sites (Table 1). The fish sampled during this time were chinook salmon (49%), chum salmon (29%), and coho salmon (22%). The following analysis of the relationship between environmental factors and salmon placed at risk by river level fluctuations focuses on each of these three salmon species.
Author: Allison N. Matter
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 60
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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 : 64
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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 : 62
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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 : 51
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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.
