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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 : 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 : 73
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Book Description
The 2013 Anchor River Chinook salmon (Oncorhynchus tshawytscha) escapement (4,401 fish, SE 117) fell within the sustainable escapement goal (SEG) range of 3,800?10,000 fish. High river flows changed the channel morphology at the confluence of the north and south forks, which rendered the 2003?2012 mainstem dual-frequency identification sonar (DIDSON) site unsuitable for monitoring escapement. Thus, for the 2013 season, the DIDSON was relocated about 0.3 RKM downstream and was operated throughout the high-water period. Once flows subsided, 2 alternative escapement monitoring sites were identified upstream: 1 on the south fork and 1 on the north fork. The north fork site was located approximately 1.5 RKM upstream from the confluence and the south fork site was located approximately 0.2 RKM upstream of the confluence. Weirs and underwater video systems were used at both sites to monitor escapement. The midpoint of the Chinook salmon run was 19 June. The daily Chinook salmon escapement counts were positively correlated with daily average river stage, but not with daily average river temperature. The dominant age class was ocean age 3 (43.5%, SE 4.1%). Overall mean length of males (604 mm, SE 15) was smaller than that of females (734 mm, SE 25). The inriver sport fishery was restricted by a series of emergency orders that probably resulted in a near record low harvest of 97 fish.
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 : 99
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Book Description
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: Nicole J. Szarzi
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 18
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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: 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: Scott H. Maclean
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 29
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Book Description
