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Mixed Stock Analysis And Age Sex And Length Composition Of Chinook Salmon In The Eastside Set Gillnet Fishery In Upper Cook Inlet Alaska 2010 2013
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Book Synopsis Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2010-2013 by : Tony Eskelin
Download or read book Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2010-2013 written by Tony Eskelin and published by . This book was released on 2013 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length (ASL) composition from the Upper Cook Inlet Eastside set gillnet commercial fishery in the years 2010-2013.
Book Synopsis Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2015 by : Tony Eskelin
Download or read book Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2015 written by Tony Eskelin and published by . This book was released on 2016 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length (ASL) composition from the Upper Cook Inlet Eastside set gillnet (ESSN) commercial fishery in 2015. Mixed stock analysis (MSA) 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. In 2015, the total reported harvest was 7,781 Chinook salmon, with an estimated composition of 5,988 (77%) Kenai River mainstem, 1,564 (20.1%) Kasilof River mainstem, 211 (2.7%) Cook Inlet other, and 19 (0.2%) Kenai River tributaries stocks. Kenai River mainstem fish have composed on average 69.1% of the harvest since 2010. Nearly all the remainder of the harvest was composed of Kasilof River mainstem fish. The overall age composition of the sample was 14.2% age-1.1 fish, 37.4% age-1.2 fish, 24.3% age-1.3 fish, 23.8% age-1.4 fish, and 0.3% age-1.5 fish. The sex composition was 69% males and 31% females. Average mid eye to tail fork (METF) length of the sample was 742 mm.
Book Synopsis Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2014 by : Tony Eskelin
Download or read book Mixed Stock Analysis and Age, Sex, and Length Composition of Chinook Salmon in the Eastside Set Gillnet Fishery in Upper Cook Inlet, Alaska, 2014 written by Tony Eskelin and published by . This book was released on 2015 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length (ASL) composition from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2014.
Book Synopsis Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2018, with Large Fish Composition Estimates for 2010-2014 by : Anthony Alexander Eskelin
Download or read book Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2018, with Large Fish Composition Estimates for 2010-2014 written by Anthony Alexander Eskelin and published by . This book was released on 2019 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2018. Mixed-stock analysis (MSA) was conducted on tissue samples collected to represent harvest by date and area. Reported harvest was 2,312 Chinook salmon, with an estimated composition of 1,710 (75%) Kenai River mainstem, 428 (19%) Kasilof River mainstem, 77 (3%) Kenai River tributaries, and 69 (3%) Cook Inlet Other fish, and 28 fish not represented in the MSA. Kenai River mainstem fish have composed on average 72% of the harvest since 2010, ranging from 61% in 2014 to 79% in 2017. Estimated harvest of large (75 cm mid eye to tail fork and longer) Kenai River mainstem Chinook salmon in 2018 was 555 fish (24% of total harvest and 77% of total large fish harvest). A retrospective MSA by size, time, and area was conducted on tissue samples collected in 2010, 2011, 2013, and 2014. Including these results and those from 2015 to 2018, large Kenai River mainstem fish have composed on average 36% of the total harvest since 2010 ranging from 23% in 2013 to 63% in 2017. Large Kenai River mainstem fish have composed on average 70% of the total large fish harvest ranging from 60% in 2010 to 79% in 2017. Age composition of all fish in 2018 was 13% age-1.1 (jacks), 54% age-1.2, 12% age-1.3, 21% age-1.4, and less than 1% age-1.5 fish. The combined percentage of jacks and age-1.2 fish (67% in total) was the highest observed and the percentage of age-1.3 fish (12%) was the lowest observed since sampling began in 1987. Sex composition of the Chinook salmon harvest was 82% males and 18% females. Average mid eye to tail fork length was 685 mm, the 2nd lowest ever observed and lowest since 2013.
Book Synopsis Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2019 by : Anthony Alexander Eskelin
Download or read book Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2019 written by Anthony Alexander Eskelin and published by . This book was released on 2020 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2019. Mixed-stock analysis (MSA) was conducted on tissue samples collected to represent harvest by date and area. Reported harvest was 2,245 Chinook salmon, with an estimated composition of 1,458 (65%) Kenai River mainstem, 714 (32%) Kasilof River mainstem, 49 (2%) Kenai River tributaries, and 25 (1%) Cook Inlet other fish. Kenai River mainstem fish have composed on average 71% of the harvest since 2010, ranging from 61% in 2014 to 79% in 2017. Estimated harvest of large (75 cm mid eye to tail fork and longer) Kenai River mainstem Chinook salmon in 2019 was 613 fish (27% of total harvest and 60% of large fish harvest). Large Kenai River mainstem fish have composed on average 35% of the total harvest since 2010 ranging from 23% in 2013 to 63% in 2017. Large Kenai River mainstem fish have composed on average 69% of the large fish harvest ranging from 60% in 2010 and 2019 to 79% in 2017. Age composition of the total harvest in 2019 was 14% age-1.1 (jacks), 33% age-1.2, 42% age-1.3, 11% age-1.4, and less than 1% age-1.5 fish. The percentage of age-1.4 fish (11%) in the harvest was the lowest observed since sampling began in 1987. Sex composition of the Chinook salmon harvest was 74% males and 26% females. The average mid eye to tail fork length was 715 mm in 2019, the 4th lowest ever observed.
Book Synopsis Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2020 by : Anthony Alexander Eskelin
Download or read book Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2020 written by Anthony Alexander Eskelin and published by . This book was released on 2021 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length from the Upper Cook Inlet Eastside set gillnet commercial fishery in 2020. Mixed-stock analysis (MSA) was conducted on tissue samples collected to represent harvest by date and area. Reported harvest in the ESSN fishery was 852 Chinook salmon of all sizes (all-fish harvest), with an estimated composition of 561 (66%) Kenai River mainstem, 163 (19%) Kasilof River mainstem, 21 (3%) Kenai River tributaries, and 107 (13%) Cook Inlet other fish. Kenai River mainstem fish have composed on average 70% of the all-fish harvest since 2010, ranging from 61% (2014) to 79% (2017). Estimated harvest of large (75 cm mid eye to tail fork and longer) Kenai River mainstem Chinook salmon in 2020 was 166 fish (19% of the all-fish harvest and 68% of the large fish harvest). Large Kenai River mainstem fish have composed on average 33% of the all-fish harvests since 2010 ranging from 19% (2020) to 63% (2017). Large Kenai River mainstem fish have composed on average 69% of the large fish harvest ranging from 60% (2010 and 2019) to 79% (2017). Age composition of the all-fish harvest in 2020 was 33% age-1.1 (jacks), 36% age-1.2, 22% age-1.3, and 9% age-1.4 fish. The percentage of age-1.4 fish (10%) in the all-fish harvest was the lowest observed, and the percentage of jacks (33%) was the highest observed since sampling began in 1987. Sex composition of the all-fish harvest was 88% males and 12% females. The average mid eye to tail fork length was 628 mm in 2020, the lowest ever observed.
Book Synopsis Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2021 by : Anthony Alexander Eskelin
Download or read book Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2021 written by Anthony Alexander Eskelin and published by . This book was released on 2022 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon were sampled for genetic tissue and age, sex, and length from the Upper Cook Inlet Eastside set gillnet (ESSN) commercial fishery in 2021. Mixed-stock analysis (MSA) was conducted on tissue samples collected to represent harvest by reporting group, date, area, and size. Reported harvest in the ESSN fishery was 1,297 Chinook salmon of all sizes (all-fish harvest), with an estimated composition of 909 (70%) Kenai River mainstem, 166 (13%) Kasilof River mainstem, 217 (17%) Cook Inlet other fish, and 4 (
Book Synopsis Operational Plan: Upper Cook Inlet Commercial Eastside Set Gillnet Chinook Salmon Harvest Composition Study 2021-2023 by : Anthony Alexander Eskelin
Download or read book Operational Plan: Upper Cook Inlet Commercial Eastside Set Gillnet Chinook Salmon Harvest Composition Study 2021-2023 written by Anthony Alexander Eskelin and published by . This book was released on 2022 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Age, sex, and length composition information will be collected from harvested Chinook salmon in the Upper Cook Inlet Eastside set gillnet (ESSN) commercial fishery in 2021–2023. Genetic tissues from the harvest will also be collected and archived for potential future mixed stock analysis. The primary goal of the study is to estimate the age, sex, and length composition of the Chinook salmon harvest and to estimate the harvest of large (>75 cm METF) Kenai River Chinook salmon in the ESSN fishery for each season (2021–2023). Age, sex, and length composition will be estimated for each temporal and geographic stratum and for each season. The harvest of large Kenai River Chinook salmon will be estimated using historical (2010–2020) large fish stock compositions relative to the total large fish harvest for each temporal and geographic stratum and summed to the total for each season.
Book Synopsis Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2016, Including Large Fish Harvest for 2015 and 2016 by : Anthony Alexander Eskelin
Download or read book Eastside Set Gillnet Chinook Salmon Harvest Composition in Upper Cook Inlet, Alaska, 2016, Including Large Fish Harvest for 2015 and 2016 written by Anthony Alexander Eskelin and published by . This book was released on 2017 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 (
Book Synopsis New Genetic Baseline for Upper Cook Inlet Chinook Salmon Allows for the Identification of More Stocks in Mixed Stock Fisheries by : Andrew W. Barclay
Download or read book New Genetic Baseline for Upper Cook Inlet Chinook Salmon Allows for the Identification of More Stocks in Mixed Stock Fisheries written by Andrew W. Barclay and published by . This book was released on 2019 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes an updated genetic baseline for Upper Cook Inlet Chinook salmon that allows for the identification of more stocks in mixed stock fisheries than previously possible. Chinook salmon are harvested in commercial, sport, subsistence, and personal use fisheries in Upper Cook Inlet, Alaska. Harvests often occur in areas where stocks intermingle, highlighting the need for understanding stock of origin in fishery catches to improve fishery management. Mixed stock analysis (MSA) has been used to estimate the stock composition of harvests in Cook Inlet since 2013. However, MSA applications have been limited by inadequate genetic structure, making northern Cook Inlet stocks of management and fishery importance difficult to distinguish: west Cook Inlet, Yentna River, and western Susitna stocks were indistinguishable; and eastern Susitna River and Matanuska River stocks were indistinguishable. Here we use cutting-edge genotyping by sequencing techniques to produce a baseline containing 67 Chinook salmon populations and 413 genetic markers and examine the baseline for population structure and test for potential reporting groups (stocks) using new baseline evaluation methods. Tests of potential reporting groups revealed 10 groups with adequate genetic divergence to meet the criteria for reporting groups. The 10 groups identified were (1) West, (2) Susitna, (3) Deshka, (4) Yentna, (5) Knik-Turnagain, (6) Kenai Mainstem, (7) Kenai Tributary, (8) Kasilof Mainstem, (9) Kasilof Tributary, and (10) South Kenai Pen. The data presented in this report will allow for more accurate, precise and finer-scale reporting group estimates for MSA studies in Cook Inlet and improved fisheries management.
Book Synopsis Genetic Stock Composition of the Commercial and Sport Harvest of Chinook Salmon in Westward Region, 2014-2016 by : Kyle Shedd
Download or read book Genetic Stock Composition of the Commercial and Sport Harvest of Chinook Salmon in Westward Region, 2014-2016 written by Kyle Shedd and published by . This book was released on 2016 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary goal of this study was to estimate the stock of origin, age, size, and sex composition of Chinook salmon, Oncorhynchus tshawytscha, harvested in Westward Region commercial and Kodiak area sport fisheries during 2014--2016 as part of the larger statewide Chinook Salmon Research Initiative. Chinook salmon commercial and sport harvest in the Kodiak area were sampled from 2014 to 2016; however, budgetary constraints limited sampling of North Peninsula, South Peninsula, and Chignik commercial harvest to 2014. A total of 10,154 Chinook salmon tissue samples were collected from 4 commercial fishery areas and sport fisheries in the Kodiak area. Of these, 8,829 samples were genotyped to represent 25 spatiotemporal strata. Stock compositions were estimated with genetic mixed stock analysis for all strata using a comprehensive, coastwide Chinook salmon baseline with important local stocks defined as separate reporting groups, to the extent possible. Harvests in both the commercial and marine sport fisheries were dominated by British Columbia and West Coast U.S. stocks, followed by smaller contributions from Southeast Alaska/Northeast Gulf of Alaska, Cook Inlet, and Kodiak. Stock composition estimates were consistent among strata within commercial and marine sport harvests, although there were differences between these fisheries. In the annual commercial harvest, over 50% of the fish were from British Columbia and over 30% of the fish were from the West Coast U.S. In the marine sport fishery, the relative abundance of British Columbia and West Coast U.S. fish varied, but jointly represented over 80% of annual harvest. In both the commercial and sport fisheries, the annual harvest of Kodiak-origin Chinook salmon was below 5% of the total harvest. These results provide the most comprehensive estimates of stock composition and stock-specific harvests of Chinook salmon in the Kodiak area, supplement previous studies, and should inform fishery management and regulatory decision makers.
Book Synopsis Northern Cook Inlet Chinook Salmon Marine Harvest Stock Composition, 2014-2015 by : Adam St. Saviour
Download or read book Northern Cook Inlet Chinook Salmon Marine Harvest Stock Composition, 2014-2015 written by Adam St. Saviour and published by . This book was released on 2019 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic tissue samples were collected from Chinook salmon harvested in the Northern District commercial set gillnet fishery and the Tyonek subsistence fishery 2014-2015 to determine stock composition of marine harvests in Northern (Upper) Cook Inlet (NCI). Enough samples were collected both spatially and temporally to represent 97% (2014) and 80% (2015) of commercial harvests and 100% (2014-2015) of subsistence harvests. Genetic mixed-stock analysis produced stock composition and stock-specific harvest estimates by reporting group for each fishery. The 4 reporting groups chosen for these analyses were 1) NCI Northwest, 2) Susitna-Matanuska, 3) Knik-Turnagain, and 4) Kenai Peninsula. In both years of the study, NCI Northwest, Susitna-Matanuska, and Knik-Turnagain reporting groups composed over 98% of the total harvests in both the Northern District commercial and Tyonek subsistence fisheries. The NCI Northwest and Susitna-Matanuska reporting groups composed a majority of harvests in the General Subdistrict (south) (88-96%), and the Knik-Turnagain reporting group composed the majority of harvests in the General Subdistrict (north) (71-89%) in both years. The NCI Northwest, Susitna-Matanuska, and Knik-Turnagain reporting groups composed over 98% of the Eastern Subdistrict commercial harvest in both years, with similar contributions of the 3 reporting groups in 2014 (28-36%) and higher contributions from the Knik-Turnagain reporting group in 2015 (56%). In the Tyonek subsistence fishery, the NCI Northwest (56%) and Susitna-Matanuska (39%) reporting groups composed the majority of the harvest in 2014, and the NCI Northwest reporting group made up most of the harvest in 2015 (79%). These results represent the first mixed-stock analysis using genetic information from Chinook salmon captured in NCI fisheries.
Book Synopsis Coded Wire Tag Augmented Genetic Mixed Stock Analysis of Chinook Salmon Harvested in Cook Inlet Marine Sport Fishery, 2014-2017 by : Andrew W. Barclay
Download or read book Coded Wire Tag Augmented Genetic Mixed Stock Analysis of Chinook Salmon Harvested in Cook Inlet Marine Sport Fishery, 2014-2017 written by Andrew W. Barclay and published by . This book was released on 2019 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chinook salmon Oncorhynchus tshawytscha stocks support important fisheries in Cook Inlet, Alaska. Many Chinook salmon stocks in Alaska have been in decline since 2007. Stock-specific harvest of Chinook salmon in the Cook Inlet marine sport fishery was identified as one of many information gaps hindering an understanding of the reasons for these declines. Here we report genetic baseline evaluation tests for mixed stock analysis and select mixed stock analysis results using genetic and coded wire tag data (gcMSA) from Chinook salmon harvested in the Cook Inlet marine sport fishery from 2014 to 2017. Results of the baseline tests indicated adequate genetic variation to distinguish among 4 reporting groups of interest to management (Outside CI, Northern CI, Kenai, and S. Kenai Pen.). The gcMSA results were obtained from 4,780 Chinook salmon sampled from the Cook Inlet marine sport fishery. Stock composition and stock-specific harvests were estimated for the Upper Cook Inlet early fishery and Lower Cook Inlet summer and winter fisheries for all 4 years and Upper Cook Inlet late fishery for 2016 and 2017 only. The Outside CI reporting group dominated all fisheries. The contribution of Cook Inlet Chinook salmon stocks was greatest in Upper Cook Inlet and ranged from 10.1% to 24.7% in the early fishery and from 3.5% to 18.0% in the late fishery. In Lower Cook Inlet, Cook Inlet stocks contributed 1.0 to 3.9% in the summer fishery and less than 1.0% of the harvest in the winter fishery in all 4 years.
Book Synopsis Northern Cook Inlet Chinook Salmon Marine Harvest Stock Composition, 2016-2017 by : Adam St. Saviour
Download or read book Northern Cook Inlet Chinook Salmon Marine Harvest Stock Composition, 2016-2017 written by Adam St. Saviour and published by . This book was released on 2020 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Historical Age and Length Composition of Sockeye, Chinook, Coho and Chum Salmon in Selected Commercial Fisheries and River Escapements, 1979-2008, Upper Cook Inlet, Alaska by : Terri M. Tobias
Download or read book Historical Age and Length Composition of Sockeye, Chinook, Coho and Chum Salmon in Selected Commercial Fisheries and River Escapements, 1979-2008, Upper Cook Inlet, Alaska written by Terri M. Tobias and published by . This book was released on 2010 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this report is to summarize all available age, length and sex composition data that can be utilized from data collected since 1979. This report supersedes Regional Information Report 2A04-12 "Age and Length Composition of Sockeye, Chinook, Coho, and Chum Salmon from 1979-2003 and Sockeye Salmon Female Contribution from 1987-2003 in selected Commercial Fisheries and River Escapements, in Upper Cook Inlet, Alaska."
Book Synopsis Chinook Salmon Sport Harvest Genetic Stock and Biological Compositions in Cook Inlet Salt Waters, 2014–2018 by : Martin Schuster
Download or read book Chinook Salmon Sport Harvest Genetic Stock and Biological Compositions in Cook Inlet Salt Waters, 2014–2018 written by Martin Schuster and published by . This book was released on 2021 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Genetic Stock Composition of the Commercial Harvest of Chinook Salmon in Copper River District, 2013-2017 by : Sara Ellen Gilk
Download or read book Genetic Stock Composition of the Commercial Harvest of Chinook Salmon in Copper River District, 2013-2017 written by Sara Ellen Gilk and published by . This book was released on 2017 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
