Mixed Stock Analysis of Chinook Salmon Harvested in Southeast Alaska Commercial Troll and Sport Fisheries, 2019 PDF Download
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Author: Kyle Shedd
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
Chinook salmon originating in Alaska, British Columbia, and the Pacific Northwest are harvested in Southeast Alaska (SEAK) commercial troll and sport fisheries. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 Aggregate Abundance-Based Management (AABM) fisheries under provisions of the Pacific Salmon Treaty Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the SEAK troll fisheries since 1998 and sport fisheries since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in Pacific Salmon Treaty fisheries. Genetic methods allow direct estimation of the major stock groups contributing to these fisheries. This project estimated the relative stock composition of troll and sport fishery harvests from fishery accounting year (AY) 2019 (Oct. 1, 2018–Sept. 30, 2019). The major contributors to the troll and sport fisheries ordered from north to south were Southeast Alaska/Transboundary River, North/Central British Columbia, West Coast Vancouver Island, South Thompson, Washington Coast, Interior Columbia River summer/fall, and Oregon Coast reporting groups. Collectively, these 7 stock aggregates, referred to as driver stocks, accounted for 93% of the troll harvest and 95% of the sport harvest. The South Thompson driver stock was the largest contributor to the troll fishery (24% of the harvest), and Southeast Alaska/Transboundary River (TBR) and West Coast Vancouver Island stock groups were the largest contributors to the sport fishery (31% of the harvest each). Results indicate considerable temporal and spatial variation in the composition of troll and sport harvests in AY 2019, and changes in the relative contributions of driver stocks across years. Stock composition data from this and other stock assessments are being used to provide fisheries information, including stock-specific run reconstructions and forecasting of run sizes to transboundary rivers, and separate harvest estimates of SEAK and TBR wild and hatchery salmon.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
Chinook salmon originating in Alaska, British Columbia, and the Pacific Northwest are harvested in Southeast Alaska (SEAK) commercial troll and sport fisheries. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 Aggregate Abundance-Based Management (AABM) fisheries under provisions of the Pacific Salmon Treaty Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the SEAK troll fisheries since 1998 and sport fisheries since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in Pacific Salmon Treaty fisheries. Genetic methods allow direct estimation of the major stock groups contributing to these fisheries. This project estimated the relative stock composition of troll and sport fishery harvests from fishery accounting year (AY) 2019 (Oct. 1, 2018–Sept. 30, 2019). The major contributors to the troll and sport fisheries ordered from north to south were Southeast Alaska/Transboundary River, North/Central British Columbia, West Coast Vancouver Island, South Thompson, Washington Coast, Interior Columbia River summer/fall, and Oregon Coast reporting groups. Collectively, these 7 stock aggregates, referred to as driver stocks, accounted for 93% of the troll harvest and 95% of the sport harvest. The South Thompson driver stock was the largest contributor to the troll fishery (24% of the harvest), and Southeast Alaska/Transboundary River (TBR) and West Coast Vancouver Island stock groups were the largest contributors to the sport fishery (31% of the harvest each). Results indicate considerable temporal and spatial variation in the composition of troll and sport harvests in AY 2019, and changes in the relative contributions of driver stocks across years. Stock composition data from this and other stock assessments are being used to provide fisheries information, including stock-specific run reconstructions and forecasting of run sizes to transboundary rivers, and separate harvest estimates of SEAK and TBR wild and hatchery salmon.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 73
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Book Description
Chinook salmon originating in Alaska, British Columbia, and the Pacific Northwest are harvested in Southeast Alaska (SEAK) commercial troll and sport fisheries. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 aggregate abundance-based management fisheries under provisions of the Pacific Salmon Treaty Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the SEAK troll and sport fisheries since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in Pacific Salmon Treaty fisheries. Genetic methods allow direct estimation of the major stock groups contributing to these fisheries. This project estimated the relative stock composition of troll and sport fishery harvests from fishery accounting year (AY) 2018 (Oct. 1, 2017–Sept. 30, 2018). The major contributors to the troll and sport fisheries ordered from north to south were the Southeast Alaska/Transboundary River, North/Central British Columbia, West Coast Vancouver Island, South Thompson, Washington Coast, Interior Columbia River Summer/Fall, and Oregon Coast reporting groups. Collectively, these 7 stock aggregates, referred to as driver stocks, accounted for 91% of the troll harvest and 95% of the sport harvest. The Southeast Alaska/Transboundary River driver stock was the largest contributor to both the troll (18%) and sport fishery (38%) harvest. Results indicate considerable temporal and spatial variation in the composition of troll and sport harvests in AY 2018, and changes in the relative contributions of driver stocks across years. Stock composition data from this and other stock assessments are being used to provide fisheries information including stock-specific run reconstructions and forecasting of run sizes to transboundary rivers, and separate harvest estimates of SEAK and transboundary river wild and hatchery salmon.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 72
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Book Description
Chinook salmon originating from Alaska, British Columbia, and the Pacific Northwest are harvested in the Southeast Alaska (SEAK) commercial troll and sport fisheries. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 aggregate abundance-based management fisheries under provisions of the Pacific Salmon Treaty (PST) Agreement. Genetic methods have been implemented in SEAK since 2004 and allow direct estimation of the major stock groups contributing to these fisheries. This project estimated the relative stock composition of SEAK troll and sport fishery harvests from fishery accounting year (AY) 2017 (October 1, 2016-September 30, 2017). The major contributors to the SEAK fisheries ordered from north to south were the Southeast Alaska/Transboundary River, North/Central British Columbia, West Vancouver, South Thompson, Washington Coast, Interior Columbia River Summer/Fall (Su/F), and Oregon Coast reporting groups. Collectively, these 7 stock aggregates, referred to as driver stocks, accounted for 89% of the troll harvest and 95% of the sport harvest. The Interior Columbia River Su/F driver stock was the largest contributor to the troll fishery (24% of the harvest), and Southeast Alaska/Transboundary River was the largest contributor to the sport fishery (28% of the harvest). Results indicate considerable temporal and spatial variation in the composition of troll and sport harvests in AY 2017 and across years. Stock composition data from this and other stock assessments are used to provide fisheries information including stock-specific run reconstructions, forecasting of run sizes to transboundary rivers, determining the origin of catches in the SEAK troll fishery by age to assist in evaluation of the Pacific Salmon Commission Chinook Model, estimating harvest of SEAK and transboundary river wild and hatchery salmon separately, and estimating some terminal run sizes of stocks in the PST area that drive the SEAK fishery. three-event mark-recapture experiment was conducted on northern pike Esox lucius in Minto Flats, Alaska from March through August 2018. Abundance was estimated for 2 specific populations: 1) an overwintering population residing in the Chatanika River upriver from its confluence with Goldstream Creek, called the Chatanika River Overwintering Area (CROA); and 2) a summer population occupying a wetland complex defined as the Minto Lakes Study Area (MLSA). Fish were sampled and marked in the CROA from 7-23 March 2018 and 12-21 June 2018 in the MLSA. Recapture events occurred in the MLSA from 12-21 June 2018 (concurrent with marking) and 7-16 August 2018. One-hundred radio tags were deployed during March 2018 to evaluate movements of northern pike relative to the mark-recapture experiment. Two models were used to estimate abundances: a traditional two-event Petersen mark-recapture model for closed populations, and a multinomial Bayesian model. The Petersen model abundance estimate of fish ≥600 mm fork length (FL) in the CROA was 14,817 (SE = 1,836) and for the MLSA was 11,956 (SE = 5,836). The Bayesian multinomial model abundance estimate for fish ≥600 mm FL in the CROA was 14,675 (SE = 1,631) and for the MLSA was 11,443 (SE = 1,651). The Bayesian multinomial model generated more precise estimates because it used data from all sampling events and incorporated information from the radiotagged fish. There were significantly more northern pike in the MLSA than what was found in 2008. Biases in the estimates were addressed and the 2 modeling approaches were evaluated. The current exploitation rate of northern pike in Minto Flats is 7.3%, which is well below the maximum threshold stipulated by the joint sport and subsistence fishery management plans.
Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 68
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Book Description
Chinook salmon originating from Alaska, British Columbia, and the Pacific Northwest are harvested in the Southeast Alaska (SEAK) commercial troll and sport fisheries. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 such fisheries under provisions of the Pacific Salmon Treaty (PST) Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the SEAK troll and sport fisheries since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in PST fisheries. This project estimated the relative stock composition of troll and sport fishery harvests from fishery accounting year (AY) 2016 (Oct. 1, 2015-Sept. 30, 2016). The major contributors to the SEAK troll and sport fisheries (from north to south) were the Southeast Alaska/Transboundary River, North/Central British Columbia, West Vancouver, South Thompson, Washington Coast, Interior Columbia River Summer/Fall (Su/F), and Oregon Coast reporting groups. Collectively, these 7 stock aggregates accounted for 90% of the troll harvest and 94% of the sport harvest, and are referred to as driver stocks. The Interior Columbia River Su/F reporting group was the largest contributor to both the troll (39%) and sport (25%) fisheries harvest. Results indicate considerable temporal and spatial variation in the composition of troll and sport harvests in AY 2016, and changes in the relative contributions of driver stocks across years. Stock composition data from this and other stock assessments provide fisheries information including stock-specific run reconstructions and forecasting transboundary river run sizes, determining the origin of SEAK troll fishery catches by age to assist in evaluation of the Pacific Salmon Commission Chinook Model, and estimating some terminal run sizes of stocks in the PST area that drive the SEAK fishery.
Author: Sara Gilk-Baumer
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 74
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Book Description
The goal of the mixed stock analysis reported here was to estimate the stock composition of Chinook salmon harvests in the Southeast Alaska commercial troll fisheries 2004 and 2009.
Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 48
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Book Description
The Southeast Alaska (SEAK) troll fishery harvests Chinook salmon originating from Alaska, British Columbia, and the Pacific Northwest. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as 1 of 3 such fisheries under provisions of the Pacific Salmon Treaty (PST) Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the SEAK commercial troll fishery since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in PST fisheries. Genetic methods allow direct estimation of the major stock groups contributing to fisheries. This project estimated the relative stock composition of seasonal troll fishery harvests from fishery accounting year 2015 (Oct. 1, 2014 - Sept. 30, 2015). The major contributors to the Southeast Alaska troll fisheries from largest to smallest were the Interior Columbia River (Summer/Fall), Southeast Alaska/Transboundary River, North/Central British Columbia, Oregon Coast, South Thompson, Washington Coast, and West Vancouver reporting groups. Collectively, these 7 stock aggregates accounted for 91% of the harvest and are referred to as driver stocks. Results indicate considerable temporal and spatial variation in the composition of troll harvests in accounting year 2015, but consistent patterns of composition across years. Stock composition data from this and other stock assessments are being used to provide fisheries information, including stock-specific run reconstructions and forecasting of run sizes to transboundary rivers, determining the origin of catches in the SEAK troll fishery by age to assist in evaluation of the Pacific Salmon Commission Chinook Model, and estimating some terminal run sizes of stocks in the PST area that drive the SEAK fishery.
Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 79
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Book Description
The Southeast Alaska (SEAK) troll fishery harvests Chinook salmon originating from Alaska, British Columbia, and the Pacific Northwest. Owing to its mixed stock nature, the overall SEAK Chinook salmon fishery is managed as one of 3 such fisheries under provisions of the Pacific Salmon Treaty (PST) Agreement. The Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvested in the SEAK troll fishery since 2004 based on a genetic baseline developed by the Genetic Analysis of Pacific Salmonids group for use in PST fisheries. Genetic methods allow direct estimation of the major stock groups contributing to fisheries. This project estimated the relative stock composition of seasonal troll fishery harvests from fishery accounting years 2010 to 2014 (Oct. 1, 2009-Sept. 30, 2014). The major contributors to the Southeast Alaska troll fisheries on an annual basis are the Andrew Creek, Southern Southeast Alaska, British Columbia Coast/ Haida Gwaii, West Coast Vancouver Island, Interior Columbia River (Summer/Fall), North Oregon Coast, Washington Coast, and South Thompson reporting groups. Results indicate considerable temporal and spatial variation in the composition of troll harvests within years, but consistent patterns of composition across years. Stock composition data from this and other stock assessments are being used to provide fisheries information including stock-specific run reconstructions and forecasting of transboundary river run sizes, determining the origin of catches in the SEAK troll fishery by age to assist in evaluation of the Pacific Salmon Commission Chinook Model, and estimating some terminal run sizes of some stocks in the PST area that drive the SEAK fishery.
Author: William D. Templin
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 45
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Book Description
The goal of the stock identification effort reported here was to estimate the stock composition of Chinook salmon harvested in the Southeast Alaska commercial troll fisheries between 1999 and 2003 using the available coastwide baseline of allozyme genetic markers.
Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 61
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Book Description
Chinook salmon originating from Alaska, British Columbia, and the Pacific Northwest are harvested in the Southeast Alaska sport fisheries. Information used to manage this fishery under the Pacific Salmon Treaty come from various sources including coded wire tags and escapements. Reliance on stock composition estimates from these data is problematic as coded wire tags are not applied to all stocks contributing to fisheries and estimates of escapement or run size are often not available or poorly determined. Expanding on previous work conducted on commercial harvests since 1999, the Alaska Department of Fish and Game has used genetic mixed stock analysis to estimate the stock composition of Chinook salmon harvests in the Southeast Alaska sport fishery from 2004 to 2015, based on microsatellite loci developed by the Genetic Analysis of Pacific Salmonids group for use in Pacific Salmon Treaty fisheries. Results indicate considerable spatial variation in the composition of sport harvests within years, but consistent patterns of composition across years. The major contributors to the Southeast Alaska sport fisheries on an annual basis are the Taku, Andrew, Stikine, S Southeast Alaska, West Vancouver, South Thompson, Washington Coast, and Interior Columbia Su/F reporting groups. The sport fisheries conducted within the inside waters of Southeast Alaska mainly consisted of stocks from Southeast Alaska and the transboundary Taku and Stikine rivers, while fisheries conducted in the outside waters were composed of a variety of stocks including those from British Columbia and the Pacific Northwest.
Author: M. Birch Foster
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 36
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Book Description
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.
