Genetic Mixed Stock Analysis of Sockeye Salmon Harvests in Selected Northern Chatham Strait Commercial Fisheries, Southeast Alaska, 2012-2014 PDF Download
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Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 76
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Book Description
This study provides precise stock-specific estimates of harvest compositions of sockeye salmon (Oncorhynchus nerka) caught in commercial purse seine fisheries in northern Chatham Straight, Southeast Alaska.
Author: Sara Ellen Gilk
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 76
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Book Description
This study provides precise stock-specific estimates of harvest compositions of sockeye salmon (Oncorhynchus nerka) caught in commercial purse seine fisheries in northern Chatham Straight, Southeast Alaska.
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: Tyler H. Dann
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 89
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Book Description
The Southeastern District Mainland (SEDM) commercial salmon fishery occurs in the Alaska Peninsula Management Area, Westward Region, is regulated based upon a board-approved management plan, and has allocative constraints between June 1 and July 25 based upon the abundance of Chignik River sockeye salmon. Significant controversy has persisted between SEDM and Chignik Management Area fishermen concerning the estimate of Chignik-bound sockeye salmon harvested in the fishery. Western Alaska Salmon Stock Identification Program used mixed stock analysis (MSA) to determine stock of origin of sockeye (and chum salmon) in commercial and subsistence fisheries throughout Western Alaska from 2006 to 2009. As a result of low returns to the Chignik River during these years, the SEDM fishery was often closed and few samples were collected for analysis. This study was designed to fill in those holes and estimate stock proportions and stock-specific harvests of sockeye salmon sampled from the SEDM fishery.
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: Kyle Shedd
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 233
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Book Description
Precise, accurate estimates of stock-specific harvests of sockeye salmon (Oncorhynchus nerka) are lacking for commercial fisheries in the Kodiak Management Area (KMA. Such information would be useful for reconstructing runs, building accurate brood tables to define escapement goals, and refining management by identifying spatial and temporal harvest patterns of local and non-local stocks. Hence, the department developed a genetic baseline for mixed-stock analysis (MSA) to estimate the stock compositions of sockeye salmon harvests in select KMA commercial salmon fisheries from 2014-2016. This report describes the methodology used to build a baseline, examines costs and benefits of a reduced marker set, describes the performance of the baseline for MSA, and provides guidance on how to interpret biases documented in the MSA tests when evaluating future stock composition estimates of KMA fishery mixtures. This genetic baseline uses single nucleotide polymorphism (SNP) markers and builds on the Western Alaska Salmon Stock Identification Project (WASSIP) sockeye salmon baseline to include additional populations in KMA and extends coverage south from Cape Suckling, Alaska to the Columbia River, Washington. The final baseline contains 65,332 individuals from 762 collections representing 473 populations in 15 reporting groups. Mean population sample size was 138 individuals. We used 2 types of tests to measure the baseline’s ability to correctly allocate to reporting groups: 100% proof tests and fishery scenario tests. Correct allocations for 100% proof tests averaged 98.2%, ranged from 80.4% to 99.6%, and 73 of the 75 proof tests met our goal of 90% correct allocation. Fishery scenario tests did not indicate any consistent directional biases among reporting groups, but misallocation was observed between Frazer and Ayakulik. Reducing the baseline from 96 to 48 SNPs had negligible effects on MSA estimates. This baseline will provide accurate and precise estimates of stock composition in KMA sockeye salmon fisheries.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 154
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Book Description
The commercial salmon fishery in the Kodiak Management Area (KMA), Westward Region, is regulated by 10 board-approved management plans intended to preserve traditional harvest opportunities while maintaining the biological integrity of KMA (local) salmon stocks and alleviating allocative concerns. Precise, accurate estimates of stock-specific harvests of sockeye salmon (Oncorhynchus nerka) are lacking for commercial fisheries in KMA. Such information would be useful for reconstructing runs, building accurate brood tables to define escapement goals, and refining management by identifying spatial and temporal harvest patterns of local and nonlocal stocks. Genetic samples were collected for mixed stock analysis (MSA) to estimate the stock compositions of sockeye salmon harvests in select KMA commercial salmon fisheries from June through August from 2014 to 2016. A total of 45,165 sockeye salmon tissue samples were collected from 6 sampling areas in KMA. Of these, 18,558 samples were ultimately genotyped to represent 47 spatiotemporal strata. Stock compositions were estimated with MSA for all strata using a comprehensive, coastwide sockeye salmon baseline with important local stocks defined as separate reporting groups. Local, Kodiak sockeye salmon contributed 88%, 58%, and 58% of the annual KMA harvests sampled for MSA during 2014--2016 (excluding harvests after August 29, or outside of the areas sampled). During this period, there was significant, nonlocal harvest of Cook Inlet sockeye salmon in all 3 years, containing 8%, 37%, and 30% of the sampled KMA harvest, as well as harvest of Chignik sockeye salmon in 2016, containing 10% of the sampled KMA harvest. These results provide the most comprehensive estimates of stock composition and stock-specific harvests of sockeye salmon in KMA, supplement previous studies, and should inform fishery management, regulatory, and policy decision makers.
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: Serena D. Rogers Olive
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 60
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Book Description
Sockeye salmon (Oncorhynchus nerka) are an important resource in Southeast Alaska (SEAK) and are harvested in subsistence, personal use, sport, and commercial fisheries. Commercial fisheries for sockeye salmon in SEAK have been prosecuted for over 100 years, with many fisheries harvesting mixed stocks composed of sockeye salmon originating from as far north as Prince William Sound and as far south as Washington. The Alaska Department of Fish and Game uses genetic mixed stock analysis to estimate stock compositions for harvest management and to meet Pacific Salmon Treaty obligations. This report describes the methods used to develop a genetic baseline of single nucleotide polymorphism allele frequencies to be used for genetic mixed stock analysis of sockeye salmon in SEAK fisheries. This baseline includes 28,609 individuals from 345 collections representing 238 populations in up to 9 reporting groups spanning from Prince William Sound to Washington. We used repeated 100% proof tests to measure the baseline's ability to accurately allocate mixed stock samples to reporting groups. Correct allocations in these tests ranged from 92.6% to 99.5%. The ability of this baseline to perform accurately in proof tests was due to the large amount of genetic variation found among populations both within and among the reporting groups. This baseline has been used successfully to estimate the stock composition of Pacific Salmon Treaty and domestic sockeye salmon stocks harvested in SEAK commercial fisheries.
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.
Author: Kyle Shedd
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 25
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Book Description
Accurate, precise estimates of stock-specific harvests of sockeye salmon (Oncorhynchus nerka) are lacking for commercial fisheries in the Kodiak Management Area (KMA). Such information would be useful for reconstructing runs, building accurate brood tables to define escapement goals, and refining management by identifying spatial and temporal harvest patterns of local and nonlocal stocks. Hence, the Alaska Department of Fish and Game developed a genetic baseline for mixed stock analysis (MSA) to estimate the stock compositions of sockeye salmon harvests in select KMA commercial salmon fisheries from 2014 to 2016. This report describes additional baseline testing done to verify the accuracy and precision of MSA performance for Frazer and Ayakulik reporting groups given their shared ancestry and close genetic relationships. Specifically, these additional fishery scenario tests better reflect the temporal nature of KMA commercial harvest by testing MSA performance with different relative proportions of early- and late-run Ayakulik and Karluk fish. These additional fishery scenario tests indicate consistent, directional biases in the misallocation of fish between Frazer and Ayakulik. The baseline is unable to provide accurate and precise estimates of stock composition for Frazer and Ayakulik reporting groups separately, but is able to when they are combined. Thus, these 2 stocks will be combined into a composite Frazer/Ayakulik reporting group for future reporting of 2014-2016 KMA commercial harvest mixtures.
