Anchor River Chinook Salmon Escapement, 2010 PDF Download
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Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 61
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Book Description
The 2010 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was estimated using dual-frequency identification sonar (DIDSON) during high spring flows and then censused using a resistance board weir when flows subsided. The Chinook salmon escapement, an estimated 4,449 fish (SE 103) fell below the lower bound of the sustainable escapement goal (SEG) of 5,000 fish and was the second lowest on record. The midpoint of the Chinook salmon run was 10 June. The Chinook salmon daily escapement counts were positively correlated (r = 0.56, df = 45, P
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 61
Get Book Here
Book Description
The 2010 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was estimated using dual-frequency identification sonar (DIDSON) during high spring flows and then censused using a resistance board weir when flows subsided. The Chinook salmon escapement, an estimated 4,449 fish (SE 103) fell below the lower bound of the sustainable escapement goal (SEG) of 5,000 fish and was the second lowest on record. The midpoint of the Chinook salmon run was 10 June. The Chinook salmon daily escapement counts were positively correlated (r = 0.56, df = 45, P
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 63
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Book Description
The 2015 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement (10,241) exceeded the sustainable escapement goal (SEG) range of 3,800–10,000 Chinook salmon. Escapement was more than twice the average of recent low-productivity years (2009–2014) and was more similar to the large escapements from 2003 to 2005. Some preseason emergency orders that restricted the inriver and nearby marine sport fisheries were rescinded as a result of the unexpectedly strong run. Escapement was based on combined counts collected on the north and south forks of the Anchor River using weirs fitted with an underwater video system in the passage chute. The midpoint of the combined Chinook salmon run was 15 June. Daily Chinook salmon counts on the south fork and average south fork river stage were significantly correlated. Age composition was determined from samples collected during weekly beach seining downstream of the weirs. The dominant age class was ocean age 3 (44.6% SE 2.6%). No significant difference was detected between the length of ocean-age-3 males and females, but there was a significant difference in the average length of the sexes for ocean-age-2 and ocean-age-4 fish. There was no significant difference between the sex composition collected from beach seine samples and that observed at the video weirs, but there was a significant difference in the proportion of jacks captured in the beach seine and that observed at the video weirs.
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 99
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Book Description
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 73
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Book Description
In 2014, the Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was fully enumerated with combined daily counts from the north and south forks of the Anchor River using weirs fitted with underwater video systems. The 2014 escapement (2,499) fell below the sustainable escapement goal (SEG) range of 3,800-10,000 Chinook salmon. It was the lowest escapement observed since Chinook salmon were first fully enumerated on the Anchor River in 2003. A series of emergency orders were issued in 2014 that restricted the inriver and nearby marine sport fisheries. The midpoint of the combined north and south fork Chinook salmon runs occurred on 15 June. No correlation was detected between daily Chinook salmon counts on the south fork and average river stage or average river temperature. Age composition was estimated from samples collected during weekly beach seining in the mainstem, downstream of the weirs. The dominant age class was ocean age 3 (40.4%; SE 3.0%). No significant differences were detected between mean lengths of ocean-age-3 males and females or between ocean-age-4 males and females. There were no significant differences between the proportion Chinook salmon ≤508 mm total length collected from beach seine samples and video weir observations. The escapement and age composition data will be used in a spawner-recruit analysis to derive appropriate escapement goals.
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 70
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Book Description
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 66
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Book Description
Discusses the Anchor River Chinook salmon Oncorhynchus tshawytscha and coho salmon O. kisutch 2009 escapement estimates.
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 64
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Book Description
The 2011 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was censused using dual-frequency identification sonar (DIDSON) during high spring flows and by a resistance board weir when flows subsided. The Chinook salmon escapement, an estimated 3,545 fish, fell below the sustainable escapement goal (SEG) range of 3,800?10,000 Chinook salmon and was the second lowest on record. The midpoint of the Chinook salmon run was 16 June. The Chinook salmon daily escapement counts were positively correlated (r = 0.41, df = 43, P = 0.0052) with average daily river stage. The dominant age class was ocean age 3 (41.1%, SE 2.9%). Overall mean length of males (648 mm, SE 7.5 mm) was smaller than that of females (751 mm, SE 8.4 mm).
Author: Nicole J. Szarzi
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 18
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Book Description
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 57
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Book Description
The 2012 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement was estimated using a dual-frequency identification sonar (DIDSON) during high spring flows, and a resistance board weir fitted with an underwater video once flows subsided. Chinook salmon escapement (4,509 fish; SE 100) fell within the sustainable escapement goal (SEG) range of 3,800?10,000. The midpoint of the Chinook salmon run was 13 June. The daily Chinook salmon escapement counts were positively correlated with daily average river stage, but not with daily average river temperature. The Chinook salmon dominant age class was ocean age 3 (50.4%; SE 4.0%). Overall mean length of males (603 mm; SE 15.4) was smaller than that of females (755 mm; SE 7.4). The inriver sport fishery was restricted by a series of emergency orders, which resulted in the lowest estimated harvest (38 fish) on record.
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 90
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Book Description
Discusses the Anchor River Chinook salmon Oncorhynchus tshawytscha and coho salmon O. kisutch escapement estimates, which were generated in 2005 and 2006 from Dual-frequency IDentification SONar (DIDSON) counts during high spring flows and counts through resistance board weir thereafter.
