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| Author | : Tyler H. Dann |
| Publisher | : |
| Total Pages | : 124 |
| Release | : 2009 |
| Genre | : Fish stock assessment |
| ISBN | : |
| Author | : Tyler H. Dann |
| Publisher | : |
| Total Pages | : 80 |
| Release | : 2011 |
| Genre | : Fish stock assessment |
| ISBN | : |
"Bristol Bay Management Area supports the largest sockeye salmon Oncorhynchus nerka fishery in the world. Alaska Department of Fish and Game is responsible for managing fisheries under the sustained-yield principle. Sockeye salmon stocks in Bristol Bay can be exploited at rates up to 80%, so accurately estimating the stock composition of catch is critical to determining the total run (catch and escapement) of each stock. Accurate estimates of total runs are vital for managing under the sustained-yield principle because they provide the basis for establishing and meeting escapement goals. In recent years, the department has developed a genetics program for sockeye salmon in Bristol Bay to develop and apply genetics methods to identify the stock composition of commercial catch in the five commercial fishing districts. Here we present genetic results from 2009, compare them to results from 2006 through 2008, and to those based on traditional age-based methods"--P. 1.
| Author | : Tyler H. Dann |
| Publisher | : |
| Total Pages | : 89 |
| Release | : 2012 |
| Genre | : Fish stock assessment |
| ISBN | : |
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 | : |
| Publisher | : |
| Total Pages | : 666 |
| Release | : 2014-05 |
| Genre | : Aquatic sciences |
| ISBN | : |
| Author | : Tyler H. Dann |
| Publisher | : |
| Total Pages | : 258 |
| Release | : 2012 |
| Genre | : Fish stock assessment |
| ISBN | : |
Uncertainty about the magnitude, frequency, location, and timing of stock-specific sockeye and chum salmon harvest in Western Alaska fisheries was the impetus for the Western Alaska Salmon Stock Identification Program (WASSIP). The program was designed to use genetic data in mixed stock analysis of fisheries samples to more clearly describe harvest patterns of sockeye and chum salmon stocks in western Alaska fisheries (from Chignik Area to Kuskokwim Area for sockeye salmon). Stock composition estimates for temporal strata across fisheries are required to estimate stock-specific harvest numbers and rates. This report describes the methodology used to estimate stock compositions for sockeye salmon, presents stock composition estimates, and provides guidance on how to interpret biases documented in the genetic baseline.
| Author | : Kyle Shedd |
| Publisher | : |
| Total Pages | : 154 |
| Release | : 2016 |
| Genre | : Fish populations |
| ISBN | : |
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 | : Andrew W. Barclay |
| Publisher | : |
| Total Pages | : 109 |
| Release | : 2010 |
| Genre | : Fish stock assessment |
| ISBN | : |
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 | : |
| Total Pages | : 15 |
| Release | : 2017 |
| Genre | : Fish populations |
| ISBN | : |
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 | : Andrew W. Barclay |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 2014 |
| Genre | : Fish stock assessment |
| ISBN | : |
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 | : Serena D. Rogers Olive |
| Publisher | : |
| Total Pages | : 60 |
| Release | : 2018 |
| Genre | : Fish stock assessment |
| ISBN | : |
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.
