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Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock identification
Languages : en
Pages : 34
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Book Description
Genetic mixed stock analysis has been used to estimate the stock compositions of sockeye salmon Oncorhynchus nerka harvested in commercial fisheries in Upper Cook Inlet (UCI), Alaska, since 2005. Here we report the genetic mixed stock analysis of samples representing 90.5% of the 2014 UCI commercial fishery harvests. Postseason analyses were performed using a previously reported baseline of 69 populations and 96 single nucleotide polymorphic markers, with the addition of 2 populations in the West reporting group (Harriet Creek and Packers Lake late run). Some stock composition patterns in the commercial fishery were similar to previous years. Drift gillnet and eastern fisheries captured greater proportions of Kenai and Kasilof rivers fish than western and northern fisheries; western set gillnet fisheries harvested a greater proportion of fish from the west side of Cook Inlet, but the drift gillnet fishery harvested greater numbers of west side fish; set gillnet fisheries closer to the Kenai or Kasilof river mouths harvested larger proportions of fish from those rivers; and set gillnet fishing areas in the Northern District generally harvested fish from nearby rivers. Unexpectedly, Susitna River fish made up a higher fraction of the drift gillnet harvest when the fleet was restricted to eastern Cook Inlet waters than when they were not restricted to eastern waters. Estimates of stock-specific harvests for UCI commercial fisheries in 2014 build upon previous years in refining understanding of productivity and the effect of management actions on the stock composition of commercial sockeye salmon harvests.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock identification
Languages : en
Pages : 34
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Book Description
Genetic mixed stock analysis has been used to estimate the stock compositions of sockeye salmon Oncorhynchus nerka harvested in commercial fisheries in Upper Cook Inlet (UCI), Alaska, since 2005. Here we report the genetic mixed stock analysis of samples representing 90.5% of the 2014 UCI commercial fishery harvests. Postseason analyses were performed using a previously reported baseline of 69 populations and 96 single nucleotide polymorphic markers, with the addition of 2 populations in the West reporting group (Harriet Creek and Packers Lake late run). Some stock composition patterns in the commercial fishery were similar to previous years. Drift gillnet and eastern fisheries captured greater proportions of Kenai and Kasilof rivers fish than western and northern fisheries; western set gillnet fisheries harvested a greater proportion of fish from the west side of Cook Inlet, but the drift gillnet fishery harvested greater numbers of west side fish; set gillnet fisheries closer to the Kenai or Kasilof river mouths harvested larger proportions of fish from those rivers; and set gillnet fishing areas in the Northern District generally harvested fish from nearby rivers. Unexpectedly, Susitna River fish made up a higher fraction of the drift gillnet harvest when the fleet was restricted to eastern Cook Inlet waters than when they were not restricted to eastern waters. Estimates of stock-specific harvests for UCI commercial fisheries in 2014 build upon previous years in refining understanding of productivity and the effect of management actions on the stock composition of commercial sockeye salmon harvests.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 55
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Book Description
This reports on mixed-stock analysis based on genetic data which was used to estimate the stock compositions of sockeye salmon (Oncorhynchus nerka) harvested in commercial fisheries in upper Cook Inlet, Alaska.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 54
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Book Description
This reports on mixed-stock analysis based on genetic data which was used to estimate the stock compositions of sockeye salmon (Oncorhynchus nerka) harvested in commercial fisheries in upper Cook Inlet, Alaska.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 60
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Book Description
This reports on mixed-stock analysis based on genetic data which was used to estimate the stock compositions of sockeye salmon (Oncorhynchus nerka) harvested in commercial fisheries in upper Cook Inlet, Alaska.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 109
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Book Description
This report updates previously reported analyses of genetic population structure and mixed-stock analysis of sockeye salmon, Oncorhynchus nerka, originating from all major spawning systems and harvested in commercial fisheries in Upper Cook Inlet, Alaska.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish stock identification
Languages : en
Pages : 62
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Book Description
Mixed stock analysis based on genetic data has been used to estimate the stock compositions of sockeye salmon Oncorhynchus nerka harvested in commercial fisheries in Upper Cook Inlet (UCI), Alaska, since 2005. Here we report the genetic mixed stock analysis samples representing 99% of the 2012 and 2013 UCI commercial fishery harvests. Postseason analyses were performed using a previously reported baseline of 69 populations and 96 single nucleotide polymorphic markers, with the addition of 2 populations in the West reporting group (Harriet Creek and Packers Lake late run). Stock composition patterns in the commercial fishery were similar to previous years: eastern fisheries generally captured more Kenai and Kasilof rivers fish than western and northern fisheries; and gillnet fisheries closer to the Kenai or Kasilof river mouths harvested larger proportions of fish from those rivers. In 2012, however, the majority of Kasilof fish were harvested in the drift gillnet fisheries due to restrictions on the set gillnet fishery. Most stocks contributed similar proportions to the overall harvest in the UCI fishery compared to previously reported years, but Fish and Kasilof stocks were 38-86% below average and Susitna/Yentna River stocks were 19-77% above average. In 2013, 2 additional drift gillnet samples were analyzed to compare harvests in the Kenai and Kasilof expanded corridor (July 11) with the districtwide harvest (July 8). Kenai and Kasilof estimates were higher in the corridor sample than the districtwide sample, whereas estimates for the remaining reporting groups were generally lower, but these differences were not significant and could be attributed to the difference in sampling date. Estimates of stock-specific harvests for UCI commercial fisheries in 2012 and 2013 build upon previous years in refining understanding of productivity and the effect of management actions on the stock composition of commercial sockeye salmon harvests.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 58
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Book Description
Chinook salmon Oncorhynchus tshawytscha stocks support important fisheries in Cook Inlet, Alaska. Many Chinook salmon stocks in Alaska have been in decline since 2007. Stock-specific harvest of Chinook salmon in the Cook Inlet marine sport fishery was identified as one of many information gaps hindering an understanding of the reasons for these declines. Here we report genetic baseline evaluation tests for mixed stock analysis and select mixed stock analysis results using genetic and coded wire tag data (gcMSA) from Chinook salmon harvested in the Cook Inlet marine sport fishery from 2014 to 2017. Results of the baseline tests indicated adequate genetic variation to distinguish among 4 reporting groups of interest to management (Outside CI, Northern CI, Kenai, and S. Kenai Pen.). The gcMSA results were obtained from 4,780 Chinook salmon sampled from the Cook Inlet marine sport fishery. Stock composition and stock-specific harvests were estimated for the Upper Cook Inlet early fishery and Lower Cook Inlet summer and winter fisheries for all 4 years and Upper Cook Inlet late fishery for 2016 and 2017 only. The Outside CI reporting group dominated all fisheries. The contribution of Cook Inlet Chinook salmon stocks was greatest in Upper Cook Inlet and ranged from 10.1% to 24.7% in the early fishery and from 3.5% to 18.0% in the late fishery. In Lower Cook Inlet, Cook Inlet stocks contributed 1.0 to 3.9% in the summer fishery and less than 1.0% of the harvest in the winter fishery in all 4 years.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 71
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Book Description
Coho salmon support important commercial and sport fisheries in Upper Cook Inlet. The Upper Cook Inlet commercial fishery harvests an average of 167,372 fish annually (2007?2016). Genetic mixed stock analysis of coho salmon harvested in test and commercial drift and set gillnet fisheries of Upper Cook Inlet was first reported for 2013?2015 harvests. Here we report genetic mixed stock analysis results for the 2016 Upper Cook coho salmon harvest. Both spatial and temporal patterns in stock composition were observed in the offshore test fishery transect: higher proportions of Turnagain/Northeast CI on the Western end and Susitna and Knik on the Eastern end, and higher proportions of Turnagain/Northeast CI and Susitna in early July and Knik in late July. Samples represented 84% of the commercial coho salmon harvest in Upper Cook Inlet. Northern Cook Inlet coho salmon stocks Northwest CI/Yentna, Susitna, and Knik made up the majority of the harvest. In August in the Central District drift gillnet fishery, proportions of Northwest CI/Yentna increased and Susitna and Knik coho salmon decreased. In the Northern District set gillnet harvest, after about August 8, Northwest CI/Yentna, Susitna, and Knik stock proportions decreased and proportions of Turnagain/Northeast CI coho salmon increased. General Subdistrict (south) harvests were dominated by Susitna and Northwest CI/Yentna, General Subdistrict (north) harvests were dominated by Knik, and Eastern Subdistrict harvests were dominated by Turnagain/Northeast CI coho salmon. These and future Cook Inlet coho salmon commercial stock composition estimates will aid in the development of brood tables to establish escapement goals using spawner-recruit analysis, and provide data for annual run forecasts.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 118
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Book Description
We conducted a study using mixed stock analysis (MSA) based on genetic data to estimate the stock compositions of sockeye salmon harvests in select Kodiak Management Area (KMA) commercial salmon fisheries from June through August from 2014 to 2016. This information was presented to the Alaska Board of Fisheries (BOF) in January 2017. This study showed that nonlocal harvest of Cook Inlet-origin sockeye salmon occurred in all 3 years, amounting to 8%, 37%, and 30% of the sampled KMA sockeye salmon harvest. The BOF asked the Alaska Department of Fish and Game to further separate Cook Inlet harvest into 4 subregional reporting groups: Kenai, Kasilof, Susitna, and Other Cook Inlet. This addendum to the original study describes additional genetic baseline testing done to verify the accuracy and precision of MSA performance for the 4 Cook Inlet subregional reporting groups and the stock-specific harvest results for the 34 of 47 spatiotemporal strata where Cook Inlet-origin fish contributed greater than 5% of the harvest. In each of the 3 years, the majority of the harvest of Cook Inlet sockeye salmon in the KMA came from the Kenai subregional reporting group. Annual stock compositions of the sampled KMA sockeye harvest ranged from 4.0-21.4% for Kenai, 1.7-6.1% for Kasilof, 0.3-4.4% for Susitna, and 0.8-4.7% for the Other Cook Inlet reporting group.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 15
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Book Description
In December of 2016, ADF&G released a report that used genetic MSA to estimate the stock composition and stock-specific harvest of commercial sockeye salmon harvests in the Kodiak Management Area (KMA) from 2014 to 2016 (Shedd et al. 2016). The results were originally presented to the Alaska Board of Fisheries at the KMA meeting in January, 2017, and then again at the UCI meeting in February, 2017. Nonlocal harvest of Cook Inlet sockeye salmon in KMA commercial salmon fisheries from 2014 to 2016 was substantial, but varied in magnitude both spatially and temporally (Shedd et al. 2016). Given the level of nonlocal harvest of Cook Inlet sockeye salmon, the Alaska Board of Fisheries asked ADF&G to further separate genetic estimates of Cook Inlet harvest into 4 subregional reporting groups: Kenai, Kasilof, Susitna, and Other Cook Inlet. ADF&G is preparing and will release this analysis as an addendum to the Shedd et al. (2016) report. In June of 2017, the Kodiak Fisheries Work Group requested from ADF&G overall stock-specific harvest estimates from all UCI sockeye salmon commercial fishery harvests that have been analyzed to date, including unpublished estimates from 2012 to 2016. The request included a table of stock-specific harvest estimates for the total UCI sockeye salmon commercial fishery in each year and a stacked bar plot of the estimates. This report serves 2 purposes: 1) it provides the Kodiak Fisheries Work Group with the data they requested, and 2) it is a medium for making currently unpublished estimates publicly available.
