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Author: Daryl Lescanec
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 35
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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: Daryl Lescanec
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 35
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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
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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: James William Savereide
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 19
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Book Description
Author: Daryl Lescanec
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 41
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Book Description
Chinook salmon (Oncorhynchus tshawytscha) and coho salmon (O. kisutch) annual escapements to the Little Susitna River were assessed from 2012 to 2016 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. Not all counts were complete for each run. Complete weir counts for Chinook salmon from 2014 through 2016 ranged between 3,135 and 5,026 fish. For 2013-2016, age composition for Chinook salmon averaged 38.1% age-1.2 fish, 37.1% age-1.3 fish, and 13.6% age-1.4 fish. On average, females composed 35.5% of the runs. The midpoint of the Chinook salmon runs with complete counts varied between years from 11 to 23 June. Chinook salmon escapement goals were met for the years 2013-2016. The 2012, 2014, and 2016 mean annual coho salmon weir count was 13,680 fish. An above-average coho salmon run was observed in 2014, 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 5 years. The midpoint of the coho salmon runs varied between years with complete counts from 10 to 21 August.
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.
Author: Nick Logelin
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 36
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Book Description
In 2011, the Alaska Board of Fisheries (BOF) designated Chinook salmon (Oncorhynchus tshawytscha) in the Northern District of Cook Inlet, which includes the Theodore and Lewis rivers, to be a stock of yield concern. The purpose of this project was to determine whether the current escapement survey method of a single aerial survey, conducted annually during peak Chinook salmon spawning, provides a reliable index to manage these fisheries. From 2012 to 2014, resistance board weirs were installed on the Theodore and Lewis rivers to monitor Chinook salmon escapement for comparison to the aerial index survey. Weir operation was extended through the fall to enumerate coho salmon (O. kisutch) for the 2013 and 2014 runs. Because weirs on the Theodore and Lewis rivers had numerous inoperable periods when missed passage could not be estimated for 2013 (Lewis River) and 2014 (Lewis and Theodore rivers), reliable escapement estimates could not be made for these years. The only year when a comparison between the weir count and the aerial index survey could be made for the Lewis River was 2012. Of the 58 Chinook salmon that passed the Lewis River weir in 2012, 28 (48%) were counted above the weir by aerial survey. For the Theodore River, 129 (22%) and 434 (69%) of the 577 and 630 Chinook salmon that passed the weir were accounted for in the aerial surveys in 2012 and 2013, respectively. On the Theodore River in 2013, a total of 1,560 coho salmon passed the weir between 20 July and 31 August. On the Lewis River in 2013, a total of 413 coho salmon passed the weir between 30 July and 31 August. Coho salmon counts on the Theodore and Lewis rivers in 2014 were incomplete due to several periods when the weirs were inoperable because of high water.
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: Keith A. Pahlke
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 76
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Book Description
This document reports the results of the continuing stock assessment program in Southeast Alaska, in which the Division of Sport Fish obtained indices of escapement for chinook salmon, Oncorhynchus tshawytscha, in designated streams and transboundary rivers.
Author: Carol M. Kerkvliet
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 99
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Author: Robert N. Begich
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 25
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Book Description
