Genetic Stock Identification of Chum Salmon (Onchorhynchus Keta) from the Yukon River District 5 Subsistence Fishery PDF Download

Author: William J. Spearman
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 21

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Author: M. Birch Foster
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 36

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The primary goal of this study is to use mixed stock analysis to estimate the stock composition of chum salmon Oncorhynchus keta harvested in South Alaska Peninsula Management Area (southern portion of Area M) commercial salmon fisheries during the 2022 to 2026 seasons. Relatively large harvests of chum salmon in South Alaska Peninsula fisheries in recent years corresponding with small returns of chum salmon to Western Alaska rivers has raised concerns among some stakeholders about the stock-specific harvests in South Alaska Peninsula fisheries. Salmon tagging studies published in 1926, 1964, and 1991 and subsequent genetic stock identification projects conducted in 1993-1996 and 2007-2009 demonstrated significant numbers of non-local chum salmon in the June and early July commercial fisheries of the South Alaska Peninsula. Presently, some stakeholders believe that relative abundances among stocks in the fishery have changed since stock-specific chum harvests were last estimated in South Alaska Peninsula harvests as part of the Western Alaska Salmon Stock Identification Program (WASSIP) in 2007-2009. An updated study that accurately and precisely estimates stock-specific harvests would help resolve these concerns and provide valuable management information regarding the gear- and temporal-specific harvests of chum salmon in select South Peninsula fisheries. This operational plan provides the Alaska Department of Fish and Game (ADF&G) with a sampling and genetic analysis plan to achieve that overall goal.

Author: Sean D. Larson
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 30

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Understanding the age, sex, length, and stock of origin of Chinook salmon Oncorhynchus tshawytscha, caught in subsistence fisheries of the Yukon River is important for making well informed management decisions and forecasting salmon runs. The objective of this study was to collect representative genetic mixed stock analysis information, coupled with age, sex, and length data, from the Chinook salmon subsistence harvest in the Coastal District and Districts 1–5. A total of 43 subsistence fishermen from 13 communities sampled 1,573 Chinook salmon that were harvested using gillnets, fish wheels, and dip nets. The age, sex, and length composition of the harvest was 0.3% age-3, 16.9% age-4, 47.1% age-5, 33.9% age-6, 1.8% age-7, 32.5% female, and an average of 725 mm in length. The proportion of the catch that was Canadian-origin ranged from 0.38 in District 2 to 0.72 in District 5. The data generated from this project are essential to estimate total run size of Yukon River Chinook salmon stocks, evaluate boarder passage and harvest share agreements as defined in the Pacific Salmon Treaty, and update spawner-recruit models used to estimate past and future run productivity. Due to the variability in Chinook salmon runs, management actions, and harvest, annual monitoring of the subsistence Chinook salmon harvest is needed.

Author: Richard G. Bakkala
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 100

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Author: Eleni L. Petrou
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 74

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One major goal of fisheries management is to ensure the sustainable harvest of wild populations so that productivity is stable over time. Information on population structure is necessary for effective fishery management because it helps describe the appropriate spatial scale for management units, and can identify populations that are small or isolated and need protection from overharvest. Chum salmon (Oncorhynchus keta) is a species targeted by both commercial and subsistence fisheries. Estimating fine-scale population structure of chum salmon in Alaska is of increasing concern because of fluctuating census sizes, and the uncertain effects of bycatch on specific populations. In this study we examined the genetic structure of 66 chum salmon populations spawning in waterways on the Alaska Peninsula and Kodiak Island. This area was covered by the Cordilleran Ice Sheet 25,000 years before present, and spawning habitats were unavailable for salmon at this time. Thus, colonization of the region by salmon occurred relatively recently. We found that chum salmon populations on the Alaska Peninsula and Kodiak Island contain considerable genetic diversity for the species. Patterns of differentiation appear to be influenced by the geographic distance separating populations, glacial history of the region, and time since colonization. The fine-scale genetic data that we have assembled will be useful to fisheries managers as they continue to evaluate the impacts of bycatch and monitor the long-term productivity of chum salmon populations.

Author: Nicholas A. Decovich
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 110

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Uncertainty about the magnitude, frequency, location, and timing of the nonlocal harvest of sockeye and chum salmon was the impetus for the Western Alaska Salmon Stock Identification Program. The program was designed to use genetic data in mixed stock analysis to reduce this uncertainty. A baseline of allele frequencies in spawning populations is required for use in mixed-stock analysis to estimate the stock of origin of harvested fish. This report describes the methodology used to understand the population genetic structure among chum salmon populations and to build and test a baseline for use in mixed stock analysis of chum salmon. Of the 35,921 fish from 434 collections selected to be genotyped, the final baseline was composed of 32,817 fish from 402 collections representing 310 populations. Average population sample size was 106 fish. Reporting groups were determined through a combination of stakeholder needs and identifiability using genetic information, as measured using proof tests. The final reporting groups included Asia, Kotzebue Sound, Coastal Western Alaska, Upper Yukon River, Northern District (Alaska Peninsula), Northwest District (Alaska Peninsula), South Peninsula (Alaska Peninsula), Chignik/Kodiak, and East of Kodiak.

Author: Grant Kirby
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 0

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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 632

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Author: Penelope Ann Crane
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages :

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Author: Jackie Whittle
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 58

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A genetic analysis of the prohibited species catch (PSC) of chum salmon (Oncorhynchus keta) collected during 2016 from the federally managed walleye pollock (Gadus chalcogrammus) trawl fishery in the Bering Sea and from the federal groundfish fisheries in the Gulf of Alaska (GOA) was undertaken to determine the overall stock composition of the sample sets. Samples were genotyped for 11 microsatellite markers from which stock contributions were estimated using the current chum salmon microsatellite baseline. In 2016, one genetic sample was collected for every 30.6 chum salmon caught in the Bering Sea midwater trawl fishery. The evaluation of sampling in the Bering Sea based on time, location, and vessel indicated that the genetic samples were representative of the total chum salmon PSC in the Bering Sea. The majority of the 114 chum salmon samples from the A-season were from Northeast Asia (37%) and Eastern GOA/Pacific Northwest (PNW) (37%) stocks. Based on the analysis of 2,701 chum salmon collected throughout the B-season, the largest stock groups in the catch were Eastern GOA/PNW (35%) and Northeast Asia (31%), followed by Western Alaska (19%), Southeast Asia (9%), Upper/Middle Yukon (5%), and Southwest Alaska (