Estimating Run Timing of Lake Clark Sockeye Salmon Relative to Other Kvichak River Drainage Populations PDF Download
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Author: Christopher Habicht
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 30
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Book Description
Tests the possibility of using genetic methods to determine the run-timing of Lake Clark-bound sockeye salmon relative to other Kvichak River stocks in order to manage reductions in escapement of Lake Clark stocks.
Author: Christopher Habicht
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 30
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Book Description
Tests the possibility of using genetic methods to determine the run-timing of Lake Clark-bound sockeye salmon relative to other Kvichak River stocks in order to manage reductions in escapement of Lake Clark stocks.
Author: Daniel B. Young
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 33
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Book Description
The Lake Clark sockeye salmon run, a key component of the Kvichak River run, supports important Federal subsistence fisheries. This report describes findings from a salmon counting tower project conducted on the Newhalen River from 2008 -- 2011. Specific objectives were to 1) estimate sockeye salmon escapement to Lake Clark and 2) determine age, sex, and length of the Lake Clark escapement. Estimates of escapement were made at river kilometer 36 on the Newhalen River using the same tower site and protocols used in previous studies. In 2009, turbid water conditions compromised counts after July 22 and escapement after this date was estimated using historical count data. Sockeye salmon age and size were determined from otoliths collected from the Newhalen River subsistence fishery and from post-spawning fish at Lake Clark spawning habitats. During 2008 -- 2011, total Lake Clark escapement averaged 316,496 salmon and ranged from a low of 210,372 salmon in 2009 to a high of 472,962 salmon in 2008. The 2008 -- 2011 mean escapement to Lake Clark was 22% lower than the 2000 -- 2007 mean of 403,991 and 72% lower than the mean escapement of 1,135,464 during 1980 -- 1984. During the study period, the Lake Clark escapement comprised, on average, 11% of the total Kvichak River escapement, about 5% less than observed in the 1980s and 8% less than observed during the period from 2000 -- 2007. The estimated mid-point of the run was similar to previous years in 2008 and 2011 but was likely earlier than average in 2009 and 10 days later than average in 2010. The age composition of sampled fish from Lake Clark was predominately age 1.3 (48- 65%), followed by age 1.2 (22-34%), age 2.2 (1-21%), and age 2.3 (0-9%).
Author: Carol Ann Woody
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 45
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Book Description
Author: Jeffry L. Anderson
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 36
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Book Description
In response to concerns expressed by subsistence fishers that the late run has declined in the Chignik Lake region, late run sockeye and coho salmon in the Clark River was estimated using stream walking surveys and Clark River sockeye salmon pass the Chignik weir (at the outlet of Chignik Lake) were studied using radio transmitters to estimate escapement and to determine run timing.
Author: University of Washington. School of Fisheries
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 140
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Book Description
Author:
Publisher:
ISBN:
Category : Pacific salmon
Languages : en
Pages : 242
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Book Description
Author:
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 57
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Book Description
Author: Elizabeth B. Benolkin
Publisher:
ISBN:
Category : Sockeye salmon
Languages : en
Pages : 168
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Book Description
"Salmon returning to Lake Clark, Alaska are a valuable subsistence, commercial and ecological resource, and are an important component of the larger Kvichak River escapement. Average escapement to the Kvichak River declined sharply during 1996-2005, prompting studies to investigate age and size at maturity, key life history traits of salmon linked to reproductive success and survival. We examined potential factors which may influence sockeye salmon Oncorhynchus nerka age and size at maturity: spawning habitat and ocean environment, and examined variation in both traits over time. Sockeye salmon age and length at maturity differed among spawning locations and between brood years, but no consistent patterns were observed among habitat types. Age and length at maturity differed over time; the proportion of older marine age 3 fish was larger in recent brood years, while fish were smaller during 1997-2001 compared to 1976-1980. Sea surface temperatures and coastal upwelling appeared to be important indicators of fish length, highlighting the importance of the ocean environment in salmon growth. These results demonstrate the complexity and importance of both the freshwater and ocean ecosystems in variation in age and size at maturity, and indicate that trends may not necessarily be similar among systems or years"--Leaf iii.
Author: Ole Alfred Mathisen
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 42
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Book Description
Author: Anthony Alexander Eskelin
Publisher:
ISBN:
Category : Fish stock identification
Languages : en
Pages : 0
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Book Description
Sockeye salmon were sampled for genetic tissue in the lower Kenai River at river mile (RM) 8.6 during the 2018–2020 early runs (prior to 1 July) for genetic mixed stock analysis (MSA) of stock composition for 3 reporting groups (Russian River Early, Russian River Late, and Kenai River Other) and 5 temporal strata (16 May–3 June, 4–10 June, 11–16 June, 17–23 June, and 24–30 June) each year. The MSAs represent the first stock composition estimates for sockeye salmon entering the Kenai River during the early run. Stock compositions were dominated by Russian River Early fish each year, especially for strata occurring prior to 24 June. Daily Kenai River RM 13.7 sonar passage estimates of fish between 40 cm and 75 cm (small fish) were used with stock composition estimates by stratum and summed to estimate Russian River Early sockeye salmon passage prior to 1 July each year. Russian River Early fish represented an estimated 0.91 (2018), 0.92 (2019), and 0.75 (2020) of the estimated small fish passage at RM 13.7 each year and averaged 0.86 for all 3 years (2018–2020). Estimated passage of Russian River Early fish was highest for the 4–10 June stratum (35% of each year’s early run, on average) and the 11–16 June stratum (28% of each year’s early run, on average), with those 2 strata accounting for 62% of estimated Russian River Early fish passage on average at RM 13.7. The last stratum (24–30 June) had the lowest estimated passage of Russian River Early fish, accounting for 7% of each year’s early run, on average. These results will be used to better predict inseason run strengths of Russian River early-run sockeye salmon, thereby increasing management precision to meet the escapement goal.
