New Genetic Baseline for Upper Cook Inlet Chinook Salmon Allows for the Identification of More Stocks in Mixed Stock Fisheries PDF Download
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Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 90
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Book Description
This report describes an updated genetic baseline for Upper Cook Inlet Chinook salmon that allows for the identification of more stocks in mixed stock fisheries than previously possible. Chinook salmon are harvested in commercial, sport, subsistence, and personal use fisheries in Upper Cook Inlet, Alaska. Harvests often occur in areas where stocks intermingle, highlighting the need for understanding stock of origin in fishery catches to improve fishery management. Mixed stock analysis (MSA) has been used to estimate the stock composition of harvests in Cook Inlet since 2013. However, MSA applications have been limited by inadequate genetic structure, making northern Cook Inlet stocks of management and fishery importance difficult to distinguish: west Cook Inlet, Yentna River, and western Susitna stocks were indistinguishable; and eastern Susitna River and Matanuska River stocks were indistinguishable. Here we use cutting-edge genotyping by sequencing techniques to produce a baseline containing 67 Chinook salmon populations and 413 genetic markers and examine the baseline for population structure and test for potential reporting groups (stocks) using new baseline evaluation methods. Tests of potential reporting groups revealed 10 groups with adequate genetic divergence to meet the criteria for reporting groups. The 10 groups identified were (1) West, (2) Susitna, (3) Deshka, (4) Yentna, (5) Knik-Turnagain, (6) Kenai Mainstem, (7) Kenai Tributary, (8) Kasilof Mainstem, (9) Kasilof Tributary, and (10) South Kenai Pen. The data presented in this report will allow for more accurate, precise and finer-scale reporting group estimates for MSA studies in Cook Inlet and improved fisheries management.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 90
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Book Description
This report describes an updated genetic baseline for Upper Cook Inlet Chinook salmon that allows for the identification of more stocks in mixed stock fisheries than previously possible. Chinook salmon are harvested in commercial, sport, subsistence, and personal use fisheries in Upper Cook Inlet, Alaska. Harvests often occur in areas where stocks intermingle, highlighting the need for understanding stock of origin in fishery catches to improve fishery management. Mixed stock analysis (MSA) has been used to estimate the stock composition of harvests in Cook Inlet since 2013. However, MSA applications have been limited by inadequate genetic structure, making northern Cook Inlet stocks of management and fishery importance difficult to distinguish: west Cook Inlet, Yentna River, and western Susitna stocks were indistinguishable; and eastern Susitna River and Matanuska River stocks were indistinguishable. Here we use cutting-edge genotyping by sequencing techniques to produce a baseline containing 67 Chinook salmon populations and 413 genetic markers and examine the baseline for population structure and test for potential reporting groups (stocks) using new baseline evaluation methods. Tests of potential reporting groups revealed 10 groups with adequate genetic divergence to meet the criteria for reporting groups. The 10 groups identified were (1) West, (2) Susitna, (3) Deshka, (4) Yentna, (5) Knik-Turnagain, (6) Kenai Mainstem, (7) Kenai Tributary, (8) Kasilof Mainstem, (9) Kasilof Tributary, and (10) South Kenai Pen. The data presented in this report will allow for more accurate, precise and finer-scale reporting group estimates for MSA studies in Cook Inlet and improved fisheries management.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 33
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Book Description
Chinook salmon support important commercial, sport, personal use, subsistence, and educational fisheries in Cook Inlet, Alaska with annual harvests that can exceed 90,000 fish. Many populations contribute to these harvests, which often occur in areas where stocks intermingle, so the exploitation and productivity of individual stocks are not well known. This lack of knowledge compromises both protection of stocks from overharvest and utilization of stocks with fish in excess of spawning needs. Genetic analysis, using single nucleotide polymorphism (SNP) technology, can discriminate among discrete fish stocks in fishery samples if adequate stock structure exists. Here, we update a peviously reported baseline of 30 populations using 46 SNP markers with an additional 25 populations and a subset of 42 SNP markers to determine population structure and test potential reporting groups for mixed stock analysis (MSA). After nearly doubling the number of populations in the baseline, southern region stocks continue to have greater genetic diversity than northern region stocks.
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 27
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Book Description
Chinook salmon support important commercial, sport, personal use, subsistence, and educational fisheries in Cook Inlet, Alaska with annual harvests that can exceed 100,000 fish. Many populations contribute to these harvests, which often occur in areas where stocks intermingle, so the exploitation and productivity of individual stocks are not well known. This lack of knowledge compromises both protection of stocks from overharvest and utilization of stocks with fish in excess of spawning needs. Genetic analysis, using single nucleotide polymorphism (SNP) technology, holds promise in discriminating among discrete fish stocks in fishery samples if adequate stock structure exists. Here, we examine a baseline of 30 populations using 46 SNP markers to determine population structure, which provides insight into potential identifiable units (reporting groups) for mixed stock analysis (MSA). Greater genetic diversity was found in southern stocks than in northern stocks, indicating a greater potential for stock discrimination among southern stocks than in northern stocks. An ongoing study to increase the representation and the number of populations and the number of markers in the baseline will provide a more comprehensive analysis for the potential reporting groups for MSA.
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: Tony Eskelin
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 48
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Book Description
Chinook salmon were sampled for genetic tissue and age, sex, and length (ASL) composition from the Upper Cook Inlet Eastside set gillnet commercial fishery in the years 2010-2013.
Author: Tony Eskelin
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 32
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Book Description
Chinook salmon were sampled for genetic tissue and age, sex, and length (ASL) composition from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2014.
Author: Serena D. Rogers Olive
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 29
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Book Description
Author: Andrew W. Barclay
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 22
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Book Description
The Alaska State Legislature requested a status report to the Finance Committees describing work by the Alaska Department of Fish and Game in Cook Inlet on escapement monitoring, genetics baseline data, mixed stock sampling, smolt out migration, migratory studies and habitat improvements for Chinook, coho, and sockeye salmon. This report summarizes the status of activities associated with legislative increments directed at Cook Inlet coho and sockeye salmon genetic studies conducted by the Division of Commercial Fisheries Gene Conservation Laboratory and Region II staff. For Cook Inlet coho salmon, project updates for three investigative phases are provided. In Phase I, analysis of existing samples indicated that sufficient population genetic structure exists among populations of to warrant construction of a full genetic baseline for genetic stock identification. Phase II describes the status of the genetic baseline following the second year of sampling when 3,319 fish were collected. Preliminary results using samples through 2013 indicate at least five genetic reporting groups are feasible and that additional baseline collections are be necessary before genetic stock identification can be effectively applied to Cook Inlet fishery samples. Phase III describes the status of genetic stock identification of harvests in test and commercial fisheries of Cook Inlet for the 2013-2015 seasons. To date, over 16,000 samples have been collected for future analysis from the Central District drift gill net fishery, the General and Eastern subdistrict set gill net fisheries, and the northern and southern offshore test fisheries. For sockeye salmon, we summarize the status of a project to analyze DNA from archived scales as a means to retrospectively estimate stock composition in historic Cook Inlet harvests. This is the second of a five-year project that will reconstruct Susitna River sockeye salmon escapement and total runs for the major systems in Upper Cook Inlet.
Author: Mark J. Witteveen
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 20
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Book Description
Recent low runs of Chinook salmon Oncorhynchus tshawytscha in Alaska have resulted in an increased interest in developing a more comprehensive genetic baseline throughout the state. An updated genetic baseline will allow for additional spatial resolution when examination of potential impacts of fisheries on Chinook salmon stocks using mixed stock analysis. These sampling efforts resulted in surveys of 33 areas, 27 of which resulted in new Chinook salmon collections, with 15 of those with sufficient samples (>70 individuals) to add representation to the genetic baseline. This work increased the department's knowledge regarding the abundance and distribution of Chinook salmon on the Alaska Peninsula and Kodiak Island.
Author: Anthony Alexander Eskelin
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 59
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Book Description
Chinook salmon were sampled for genetic tissue and age, sex, and length composition from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2016. Mixed-stock analysis was conducted on tissue samples that were collected to represent the harvest by date and area. The 4 reporting groups used to apportion the Chinook salmon harvest were Kenai River mainstem, Kenai River tributaries, Kasilof River mainstem, and Cook Inlet other. Reported harvest was 6,759 Chinook salmon, with an estimated composition of 4,972 (74%) Kenai River mainstem, 1,667 (25%) Kasilof River mainstem, 96 (1%) Cook Inlet other, and 24 (
