Anchor River Chinook Salmon Escapement, 2014 PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Anchor River Chinook Salmon Escapement, 2014 PDF full book. Access full book title Anchor River Chinook Salmon Escapement, 2014 by Carol M. Kerkvliet. Download full books in PDF and EPUB format.
Author: Carol M. Kerkvliet Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 73
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 : 73
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 : 63
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 : 73
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 : 64
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 : 57
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 : 61
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: Scott Kent Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 17
Book Description
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 project in 2010 funded by United States Fish and Wildlife Service's Office of Subsistence Management to obtain estimates of the mainstem Chinook salmon escapement and its age, sex, and length composition. An estimated 667 and 1,126 Chinook salmon were enumerated during the 2013 and 2014 seasons. The central 50% of the Chinook salmon run was enumerated 7 July-18 July in 2013 and could not be determined in 2014 because Chinook salmon passage was not fully evaluated. In 2013, there were 3 days of partial counts. Interpolation of missed counts could not be completed in 2014 because of incomplete information about the exact duration and extent of unmonitored periods. Age composition could not be determined from the 2013 escapement samples because the minimum sampling goal was not achieved; sex composition was 52% female. In 2014, age-1.3 Chinook salmon comprised the majority (68%) of the escapement samples.
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Nicole J. Szarzi
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Carol M. Kerkvliet
Author: Scott Kent