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.
Author: Kevin E. Thomas
Publisher:
ISBN:
Category : Pacific salmon fishing
Languages : en
Pages : 21
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Author: Anthony Alexander Eskelin
Publisher:
ISBN:
Category : Chinook salmon fisheries
Languages : en
Pages : 0
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This study investigated the travel times for Russian River early-run sockeye salmon migrating from the Kenai River sonar site at river mile (RM) 13.7 to the Russian River area sport fishery at Kenai RM 73.0 and to the Russian River weir located near lower Russian Lake. A sample of 52 sockeye salmon, captured with inriver gillnets at Kenai RM 8.6, were tagged with esophageal-implant radio transmitters during 23 May to 7 July 2017. Additionally, 218 sockeye salmon were tagged with uniquely numbered spaghetti tags to investigate travel times of fish from Kenai RM 13.7 to the Russian River weir. A total of 22 radiotagged sockeye salmon migrated to the Russian River area sport fishery, taking an average of 9.8 days with a range of 5.2 days to 16.8 days. There were 3 radiotagged fish and 11 spaghetti-tagged fish that migrated past the Russian River weir, taking an average of 17.7 days (range: 13.2 days to 20.1 days) for radiotagged fish and an average of 16.9 days (range: 12.2 days to 19.4 days) for spaghetti-tagged fish. In total, the 14 tagged fish took an average of 17.1 days (range 12.2 days to 19.4 days) to travel from Kenai RM 8.6 to the Russian River weir.
Author: David Charles Nelson
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 76
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Author: Aaron Dupuis
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 105
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Book Description
Two offshore test fisheries (OTF) operated during the 2014 Upper Cook Inlet (UCI) commercial salmon fishing season. In 2014, the southern OTF was conducted from 1 July through 1 August and captured 3,366 sockeye salmon Oncorhynchus nerka representing 2,505 catch per unit of effort (CPUE) index points. The midpoint of the 2014 sockeye salmon run at the southern OTF occurred on 16 July. Two formal inseason estimates of the 2014 run size were made on 21 and 23 July; the 23 July analysis predicted a total run to UCI of 5.8 to 9.1 million sockeye salmon. The best-fit total run estimate deviated from the actual total run of 5.28 million fish by 72%. Two inseason estimates were made for the Kenai River sockeye salmon run on 21 and 23 July; the 23 July analysis predicted a total run to the Kenai River ranging between 2.67 and 5.65 million fish. The best-fit Kenai River total run estimate from this analysis (5.65 million fish) differed from the actual total run of 3.28 million fish by 72%. A mixed stock analysis using genetic data (MSA) was performed on samples collected during the test fishery, which showed similar stock compositions to previous years. The northern OTF stations were modified in 2014 to consist of 2 transects running across UCI from the Blanchard Line to the north end of Kalgin Island and from the south end of Kalgin Island back to the Kenai Peninsula. In 2014, the northern OTF operated from July 1 through July 30 and captured 2,362 sockeye salmon. In 2014, the MSA sampling for both OTF projects was expanded to include all coho salmon O. kisutch captured to estimate spatial and temporal stock compositions of the harvest.
Author: Jenny L. Gates
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 0
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Book Description
The Russian River sockeye salmon escapement assessment project, which began in 1962, is one of the oldest stock assessment projects in the state of Alaska. During 2023–2026, the Russian River weir will be operated annually from early June through the first 7 to 10 days of September. All species of fish seen passing the weir through the fish chute will be enumerated daily. Sampling of sockeye salmon for age, sex, and length data will be done each Friday, and the sample size each week will be based on the previous week’s fish passage. Sockeye and Chinook salmon spawning downstream of the Russian River weir to the confluence of the Russian River and the Kenai River will be assessed by a foot survey during the fourth week of August. Multiple foot surveys will also be conducted from mid-May to 10 June to assess spawning rainbow trout.
Author: James J. Hasbrouck
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
The current sustainable escapement goal (700,000–1,200,000) for Kenai River late-run sockeye salmon was established in 2011. For this escapement goal review, the escapement time series and production data were updated through 2018. The fit of 6 spawner–recruit models to data from brood years 1968–2012 and brood years 1979–2012 was examined. Although the classic Ricker model was determined the most appropriate to use given the data, all brood years were estimated to have replaced themselves, which compromised obtaining accurate and precise estimates of most model parameter estimates and biological reference points, including a scientifically defensible estimate of maximum sustained yield. Markov-type yield tables were constructed to evaluate yields at different levels of escapement. We recommend the sustainable escapement goal for Kenai River late-run sockeye salmon be revised to 750,000–1,300,000 fish because the analyses indicated escapements in this range will likely provide better yields.
Author: Alyssa Frothingham
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 55
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Book Description
In 2017, the southern offshore test fishery (OTF) conducted from July 1 through July 31 captured 2,586 sockeye salmon Oncorhynchus nerka, which represented 2,194 catch per unit of effort (CPUE) index points. The midpoint of the 2017 sockeye salmon run at the southern OTF occurred on July 20. A formal inseason estimate of the 2017 run size was made on July 24 and this analysis predicted a total run to Upper Cook Inlet (UCI) of 7.11 million sockeye salmon. Therefore, the first best-fit total run estimate from the formal inseason projection of the 2017 run was approximately 54.2% higher than the actual run size. An inseason estimate was also made for the Kenai River sockeye salmon run on July 24; the July 24 analysis predicted a total run to the Kenai River that range of 1.6-4.3 million fish. Sockeye salmon and coho salmon O. kisutch genetic samples were collected from the OTF and archived for future analysis.
Author: Alyssa Frothingham
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 0
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Book Description
In 2019, the southern offshore test fishery was conducted from July 1 to July 30 and captured 1,859 sockeye salmon representing 1,476 CPUE index points, adjusted to 1,931 CPUE postseason. The midpoint of the 2019 sockeye salmon run at the southern offshore test fishery occurred on July 21. A formal inseason estimate of the 2019 run size was made on July 26; this analysis predicted a total run to Upper Cook Inlet of 6.1 million sockeye salmon. The best-fit total run estimate deviated from the estimated total run of 5.2 million fish by 15.9%. An inseason estimate was also made for the Kenai River sockeye salmon run on July 26; the July 26 analysis predicted a total run to the Kenai River ranging between 2.2 and 4.0 million fish. A postseason analysis estimated the 2019 Kenai River total sockeye salmon run to be approximately 3.6 million fish. Finally, sockeye salmon and coho salmon genetic samples were collected and archived for future analysis.
Author: Aaron Dupuis
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 67
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Book Description
In 2015, the southern offshore test fishery (OTF) was conducted from July 1 through July 30 and captured 2,378 sockeye salmon Oncorhynchus nerka representing 1,609 catch per unit of effort (CPUE) index points. The midpoint of the 2015 sockeye salmon run at the southern OTF occurred on 25 July. A formal inseason estimate of the 2015 run size was made on July 27; this analysis predicted a total run to Upper Cook Inlet (UCI) of 5.9 million sockeye salmon. The best-fit total run estimate deviated from the estimated total run of 6.30 million fish by 6.5%. An inseason estimate was also made for the Kenai River sockeye salmon run on July 27; the July 27 analysis predicted a total run to the Kenai River ranging between 2.20 and 3.53 million fish. The best-fit Kenai River total run estimate from this analysis (3.53 million fish) differed from the estimated total run of 3.89 million fish by 9.3%. A mixed stock analysis using genetic data (MSA) was performed on samples collected during the test fishery, which showed similar stock compositions to previous years. The MSA sampling for the OTF project was included all coho salmon O. kisutch captured to estimate spatial and temporal stock compositions of the harvest.
