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Author: Sara Ellen Gilk Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 50
Book Description
Chinook salmon are harvested in subsistence, commercial, sport, and personal use fisheries throughout the Copper River drainage and in nearshore marine waters. This project was designed to estimate the stock-specific harvest of Chinook salmon in the Copper River District commercial drift gillnet fishery using genetics samples from 2013 through 2017. The Chinook Salmon Research Initiative identified the Copper River as 1 of 12 indicator stocks representing the diverse life history and migratory characteristics of Alaska Chinook salmon. Adult abundance information was identified as a fundamental knowledge gap, including the absence of programs to estimate stock-specific harvest in mixed stock commercial fisheries. This project applied the available baseline of genetic information representing Chinook salmon populations from within the Copper River drainage, around the Gulf of Alaska, and from southern populations to estimate the relative stock compositions of Chinook salmon harvests in the Copper River District commercial fishery. The results show that most of the fish in the Copper River commercial fishery originated from Copper River populations, which is consistent with findings from previous studies. A consistent temporal pattern in the composition of the commercial fishery harvests was observed across the 5-year study. As the season progressed, the proportion of Upper Copper River Chinook salmon decreased, and the proportion of Lower Copper River Chinook salmon increased. The unusually high proportions of nonlocal Chinook salmon in the commercial harvest occurring during 2 of the study years (2014 and 2015) align with other reports of large numbers of out-of-area Chinook salmon in commercial fisheries throughout the southern and southeastern seaboards of Alaska. The results support the historical commercial management approach of providing inriver passage for all temporal components of the run. Genetic data allow for estimating the stock-specific harvests of wild stocks or stocks (with and without coded wire tags) from other areas.
Author: Sara Ellen Gilk Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 50
Book Description
Chinook salmon are harvested in subsistence, commercial, sport, and personal use fisheries throughout the Copper River drainage and in nearshore marine waters. This project was designed to estimate the stock-specific harvest of Chinook salmon in the Copper River District commercial drift gillnet fishery using genetics samples from 2013 through 2017. The Chinook Salmon Research Initiative identified the Copper River as 1 of 12 indicator stocks representing the diverse life history and migratory characteristics of Alaska Chinook salmon. Adult abundance information was identified as a fundamental knowledge gap, including the absence of programs to estimate stock-specific harvest in mixed stock commercial fisheries. This project applied the available baseline of genetic information representing Chinook salmon populations from within the Copper River drainage, around the Gulf of Alaska, and from southern populations to estimate the relative stock compositions of Chinook salmon harvests in the Copper River District commercial fishery. The results show that most of the fish in the Copper River commercial fishery originated from Copper River populations, which is consistent with findings from previous studies. A consistent temporal pattern in the composition of the commercial fishery harvests was observed across the 5-year study. As the season progressed, the proportion of Upper Copper River Chinook salmon decreased, and the proportion of Lower Copper River Chinook salmon increased. The unusually high proportions of nonlocal Chinook salmon in the commercial harvest occurring during 2 of the study years (2014 and 2015) align with other reports of large numbers of out-of-area Chinook salmon in commercial fisheries throughout the southern and southeastern seaboards of Alaska. The results support the historical commercial management approach of providing inriver passage for all temporal components of the run. Genetic data allow for estimating the stock-specific harvests of wild stocks or stocks (with and without coded wire tags) from other areas.
Author: Kyle Shedd Publisher: ISBN: Category : Fish populations Languages : en Pages : 154
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: Martin Schuster Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 108
Book Description
Information about stock-specific harvest of Chinook salmon in Cook Inlet saltwater sport fisheries is needed to understand the decline in productivity of Cook Inlet stocks. From 2014 through 2018, mixed stock genetic analysis was used to determine the stock composition of Chinook salmon harvest samples from Cook Inlet saltwater sport fisheries. Four genetic reporting groups were selected to represent Cook Inlet and non-Cook Inlet stocks: Outside Cook Inlet, Northern Cook Inlet, Kenai, and Southern Kenai Peninsula. Genetic reporting group stock composition and harvests were estimated annually for the following fisheries: the Upper Cook Inlet summer early and late fisheries, the Lower Cook Inlet summer fishery, and the winter fishery. The Outside Cook Inlet reporting group composed most of the harvest in all fisheries and all years (70.1–99.8%). The contribution of Cook Inlet Chinook salmon stocks was greatest in the Upper Cook Inlet fisheries (3.5–29.9%) and lowest in the winter fisheries (0.02%). Mixed stock analysis for immature and mature Chinook salmon revealed that almost all immature fish (97.6–99.2%), and a large portion of mature fish (40–81%) harvested in Cook Inlet are from nonlocal stocks. Biological data collected from Chinook salmon harvests in these fisheries indicate that older, larger, and more mature Chinook salmon are harvested in the Upper Cook Inlet summer fisheries. Coded wire tags were used to quantify known origin Chinook salmon harvests, but very few Cook Inlet tags (2) were recovered over the 5-year study. This project provides valuable stock-specific harvest information that can be used by managers to adaptively regulate Cook Inlet saltwater sport fisheries.
Author: Andrew W. Barclay Publisher: ISBN: Category : Fish populations Languages : en Pages : 15
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: M. Birch Foster Publisher: ISBN: Category : Chum salmon Languages : en Pages : 36
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.
Author: Adam St. Saviour Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 48
Book Description
Genetic tissue samples were collected from Chinook salmon harvested in the Northern District commercial set gillnet fishery and the Tyonek subsistence fishery during 2016–2017 to determine stock composition of marine harvests in Northern (Upper) Cook Inlet. Samples from the commercial harvest represented all (100%) of the commercial harvests in both 2016 and 2017. Samples from the subsistence harvests represented 98% of the subsistence harvest in 2016 and 100% of the subsistence harvest in 2017. Genetic mixed-stock analysis produced stock composition and stock-specific harvest estimates for each fishery by 6 reporting groups: 1) West, 2) Susitna, 3) Deshka, 4) Yentna, 5) Knik-Turnagain, and 6) Kenai Peninsula. For the General Subdistrict–south, harvest contributions were 34–36% Susitna in both 2016 and 2017, 24% West in 2016, followed by 19% Yentna and 14% Deshka. In 2017, harvest contributions were similar among West (19%), Yentna (17%), and Deshka (18%). For the General Subdistrict–north, harvest contributions were most (66–72%) from Knik-Turnagain in both years. For the Eastern Subdistrict, harvest contributions in both years were greatest from Knik-Turnagain (48–60%) followed by Susitna (21–23%). Overall Northern District commercial harvest contributions in 2016 and 2017 were greatest from Knik-Turnagain (32–35%), followed by Susitna (27–28%). Remaining harvest contributions were similar among West (13–14%), Deshka (11–14%), and Yentna (12–13%). In the 2016 Tyonek subsistence fishery, the largest contributions to harvest were from Susitna (32%) and West (29%) followed by Yentna (17%), Deshka (12%), and Knik-Turnagain (10%). In 2017, the Tyonek subsistence harvest was dominated by Susitna (38%) followed by Yentna (18%), West (17%), and Knik-Turnagain (16%); Deshka contributed 10%. In 2016 and 2017, harvest contributions of the Kenai Peninsula reporting group ranged from 0–2% across all 3 commercial areas and across commercial and subsistence fisheries.
Author: Sean D. Larson Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 30
Book Description
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: Charles. M. Guthrie Publisher: ISBN: Category : Bycatches (Fisheries) Languages : en Pages : 32
Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) bycatch of the 2016 Bering Sea-Aleutian Island (BSAI) trawl fishery for walleye pollock (Gadus chalcogrammus) was undertaken to determine the overall stock composition of the bycatch. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game (ADF&G) SNP baseline. In 2016, genetic samples from the Bering Sea were collected using a systematic random sampling protocol where one out of every 10 Chinook salmon encountered was sampled. Based on the analysis of 1,910 Chinook salmon bycatch samples collected throughout the 2016 BSAI walleye pollock trawl fishery, Coastal Western Alaska and British Columbia regions (34% and 29% respectively) dominated the sample set with smaller contributions from West Coast US (14%), and North Alaska Peninsula (13%) regions. Analysis of temporal groupings within the pollock "A" and "B" seasons revealed changes in stock composition during the course of the year with lower contributions of Coastal Western Alaska and North Alaska Peninsula regions and higher contributions of West Coast US, British Columbia, and NW Gulf of Alaska, regions during the "B" season when compared to the "A" season. . [doi:10.7289/V5/TM-AFSC-365 (https://doi.org/10.7289/V5/TM-AFSC-365)]
Author: Anthony Alexander Eskelin Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 59
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 (
Author: Charles. M. Guthrie Publisher: ISBN: Category : Bycatches (Fisheries) Languages : en Pages : 32
Book Description
A genetic analysis of samples from the Chinook salmon (Oncorhynchus tshawytscha) Prohibited Species Catch (bycatch) of the 2016 Gulf of Alaska (GOA) trawl fisheries for walleye pollock (Gadus chalcogrammus) and rockfish (Sebastes spp.), was undertaken to determine the stock composition of the sample sets. Samples were genotyped for 43 single nucleotide polymorphism (SNP) DNA markers and results were estimated using the Alaska Department of Fish and Game SNP baseline. In 2016, genetic samples were collected from Chinook salmon taken in the bycatch of the GOA pollock trawl fisheries using a simple random sample protocol with trip being the primary unit. This was the third year for this sampling protocol and which resulted in the largest available genetic sample set to date with 24% of the estimated salmon bycatch from the pollock fishery successfully genotyped. Based on analysis of 4,962 Chinook salmon bycatch samples, British Columbia (42%), West Coast US (40%), and Coastal Southeast Alaska (15%) comprised the largest stock groups, at an estimated 8,602, 8,301, and 3,080 Chinook salmon, respectively, out of 20,589 fish total. In 2016, genetic samples from the bycatch of the GOA rockfish CV fishery were collected by the fishing industry using a census sampling protocol. Based on the genotyping of 493 Chinook salmon bycatch samples collected from this fishery in NMFS Statistical Areas 620 and 630, West Coast US stocks represented the largest stock group (62%) with smaller contributions from British Columbia (27%), Coastal Southeast Alaska (7%), and Northwest GOA (4%) stock groups.
Author: Sara Ellen Gilk
Author: Sara Ellen Gilk
Author: Kyle Shedd
Author: Martin Schuster
Author: Andrew W. Barclay
Author: M. Birch Foster
Author: Adam St. Saviour
Author: Sean D. Larson
Author: Charles. M. Guthrie
Author: Anthony Alexander Eskelin
Author: Charles. M. Guthrie