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Author: Julie Bednarski Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 18
Book Description
The 2021 forecast of Stikine River sockeye salmon, Oncorhynchus nerka, run abundance is poor and we anticipate very little harvesting opportunity for either U.S. or Canadian fisheries. Since 1994, we have almost exclusively relied on the Canadian lower river commercial fishery to provide the migratory timing information that is used to complete the mixed stock run reconstruction for Stikine River sockeye salmon. It is highly likely there will be no fishing opportunity in 2021 to gather this pertinent information. To obtain stock composition data necessary to estimate the inriver abundance, we are initiating a sockeye salmon stock assessment program at Kakwan Point. The project will be conducted in conjunction with the existing Stikine River Chinook salmon, O. tshwaytscha, assessment program, and will extend the project through the end of the sockeye salmon run in late August. Tissue samples will be collected from sockeye salmon for genetic mixed stock analysis and for use in a genetic mark–recapture study to estimate inriver abundance based on an expansion of the Tahltan stock that is monitored via weir. We will also gather daily catch per unit effort (CPUE) information and estimate the age, sex and length (ASL) composition for sockeye salmon captured. This stock assessment program is designed to capture sockeye salmon in proportion to abundance during immigration; therefore, it is expected that it will provide an unbiased estimate of abundance. This estimate will be assessed by TTC postseason for use in the Stikine River sockeye salmon run reconstruction.
Author: Julie Bednarski Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 18
Book Description
The 2021 forecast of Stikine River sockeye salmon, Oncorhynchus nerka, run abundance is poor and we anticipate very little harvesting opportunity for either U.S. or Canadian fisheries. Since 1994, we have almost exclusively relied on the Canadian lower river commercial fishery to provide the migratory timing information that is used to complete the mixed stock run reconstruction for Stikine River sockeye salmon. It is highly likely there will be no fishing opportunity in 2021 to gather this pertinent information. To obtain stock composition data necessary to estimate the inriver abundance, we are initiating a sockeye salmon stock assessment program at Kakwan Point. The project will be conducted in conjunction with the existing Stikine River Chinook salmon, O. tshwaytscha, assessment program, and will extend the project through the end of the sockeye salmon run in late August. Tissue samples will be collected from sockeye salmon for genetic mixed stock analysis and for use in a genetic mark–recapture study to estimate inriver abundance based on an expansion of the Tahltan stock that is monitored via weir. We will also gather daily catch per unit effort (CPUE) information and estimate the age, sex and length (ASL) composition for sockeye salmon captured. This stock assessment program is designed to capture sockeye salmon in proportion to abundance during immigration; therefore, it is expected that it will provide an unbiased estimate of abundance. This estimate will be assessed by TTC postseason for use in the Stikine River sockeye salmon run reconstruction.
Author: Kristin Courtney Publisher: ISBN: Category : Fish stock assessment Languages : en Pages : 0
Book Description
The 2022 forecast of Stikine River sockeye salmon, Oncorhynchus nerka, run abundance is poor and we anticipate very little harvest opportunity for either U.S. or Canadian fisheries. Since 1994, we have almost exclusively relied on the Canadian lower river commercial fishery to provide the stock-specific information that is used to complete the mixed stock run reconstruction for Stikine River sockeye salmon. It is highly likely there will be little commercial fishing opportunity in 2022 to gather this pertinent information. To obtain stock composition data necessary to estimate the inriver abundance, we will continue to conduct a sockeye salmon stock assessment program at Kakwan Point that began in 2021. The project will be conducted in conjunction with the existing Stikine River Chinook salmon, O. tshwaytscha, stock assessment program, and will extend the project through the end of the sockeye salmon run in mid-August. Tissue samples will be collected from sockeye salmon for genetic mixed stock analysis and for use in a genetic mark–recapture study to estimate inriver abundance based on an expansion of the Tahltan stock that is monitored via weir. We will also gather daily CPUE information, capture and spaghetti tag sockeye salmon, and estimate the age, sex, and length composition for sockeye salmon captured at Kakwan Point.
Author: Teresa M. Fish Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 0
Book Description
In 2021, long-term population studies designed to evaluate adult sockeye salmon (Oncorhynchus nerka) abundance and juvenile production at Hugh Smith Lake continued. The smolt weir count of 9,000 sockeye salmon smolt was the lowest count on record. An estimated 75.7% of smolt were freshwater age-1, and 24.3% were freshwater age-2. Escapement was counted through a weir, a mark–recapture study was conducted to confirm the weir count, and biological data were collected to estimate the age, length, and sex composition of adult sockeye salmon returning to Hugh Smith Lake. The 2021 weir count of 3,235 adult sockeye salmon was below the optimal escapement goal range of 8,000–18,000 and was the 7th lowest escapement in the 1980–2021 data series. Age-1.3 fish were the most abundant age class, representing an estimated 73.8% of the total spawning population. Counts of live sockeye salmon in Buschmann Creek (not including mouth estimates) only exceeded 300 fish during 3 of 12 surveys from 20 August to 31 October (including a peak count 510 live fish on 14 September). Counts of live sockeye salmon in Cobb Creek peaked at only 40 fish on 13 September; most other counts were of 10 or less fish. Reported subsistence harvest was 111 fish, which accounted for an estimated 3.3% of the terminal run. The estimated minimum harvest rate in the District 101–108 commercial net fisheries was 79.3% in 2021.
Author: Mark J. Witteveen Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 0
Book Description
The Alaska Department of Fish and Game, Division of Sport Fish, has assessed the annual run of Buskin River sockeye salmon (Oncorhynchus nerka) on Kodiak Island, Alaska, since 1990. Buskin River sockeye salmon weir counts were 4,284, 12,297, 7,741, and 2,330 fish for 2018–2021, respectively. Weir counts for Lake Louise were 83, 73, 53, and 1,896 sockeye salmon for 2018–2021, respectively. Reported annual subsistence harvests for the Buskin River Section were 474, 836, and 1,620 sockeye salmon for 2018–2020, respectively; accurate harvest is not available for 2021 at this time. In interviews conducted with 11 subsistence users in 2019, 100% reported that the Buskin River was a traditional fishing location, and 73% reported that they subsistence fished in other areas. Interviews were not conducted in 2018 due to a low run or in 2020 and 2021 due to COVID-19. Enumerated sockeye salmon spawning escapement for the entire drainage (Buskin Lake and Louise Lake weirs) was 4,367, 12,370, 7,794, and 4,226 fish for 2018–2021, respectively. Based on a Bayesian spawner–recruitment analysis of the Buskin Lake system, estimated spawning escapement for maximum sustained yield is about 5,700 fish (95% credibility interval = 4,300–8,000). A sustained yield probability analysis supports the current Buskin Lake system biological escapement goal (BEG) range of 5,000–8,000 sockeye salmon. Age-1.2, -1.3, -2.2, and -2.3 sockeye salmon composed 93–99% of the Buskin River run. Male to female ratios for the Buskin River were between 0.6 and 1.1 to 1 for 2018–2021. Samples taken from the Lake Louise sockeye salmon run and the subsistence harvest were too low to provide reliable estimates of age and sex composition.
Author: Kelly M. Krueger Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 21
Book Description
The goal of this project is to census the sockeye salmon escapement into Buskin Lake during 2022. The age, sex, and length composition of the run (escapement and subsistence harvest combined) to Buskin Lake will also be estimated.
Author: Andrew W. Piston Publisher: ISBN: Category : Fish populations Languages : en Pages : 14
Book Description
The primary purpose of this project is to provide an estimate of the sockeye salmon escapement at McDonald Lake by conducting foot surveys on the spawning grounds at Hatchery Creek. We will also estimate the adult age composition of the escapement. Using results from a Pacific Salmon Treaty genetic stock identification project, we will estimate the contribution of McDonald Lake sockeye salmon to southern Southeast Alaska commercial net fisheries. This project also includes a fall hydroacoustic survey to estimate rearing juvenile sockeye salmon abundance.
Author: Shelby M. Flemming Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 0
Book Description
In 2020 and 2021, the Alaska Department of Fish and Game, Division of Commercial Fisheries, continued a stock assessment program that began in 1976 to estimate escapements and harvests of Chilkoot Lake sockeye salmon (Oncorhynchus nerka). Sockeye salmon were counted through a weir near the outlet of Chilkoot Lake, and age, length, and sex data were collected and analyzed each year. Sockeye salmon escapements at the weir were 60,218 fish in 2020 and 98,672 fish in 2021, which fell within or exceeded the sustainable escapement goal range of 38,000–86,000 fish. Age-1.2 male sockeye salmon in 2020 were larger than the 1982–2019 average, whereas both male and female fish of other ages fell below this average. Genetic stock identification was conducted to determine the stock composition of sockeye salmon harvested annually in the District 15 commercial drift gillnet fishery. Estimated commercial harvests of Chilkoot Lake sockeye salmon were 24,878 fish in 2020, and 50,219 fish in 2021. Estimated harvest rates (including subsistence and excluding sport harvests) were 32% in 2020 and 35% in 2021, and Chilkoot Lake sockeye salmon accounted for an estimated 50% (2020) and 59% (2021) of the annual commercial sockeye salmon harvest in District 15. The estimated fall sockeye salmon fry population at Chilkoot Lake was 66% below average in 2020 (no surveys were conducted in 2021). Average May–September zooplankton density and biomass at Chilkoot Lake were above average in 2020 and below average in 2021.
Author: Richard A. Hoffman (Biologist) Publisher: ISBN: Category : Escapement (Fisheries) Languages : en Pages : 22
Book Description
In response to guidelines established in the Policy for the management of sustainable salmon fisheries (SSFP), the Alaska Department of Fish and Game (department) recommended that the Klukshu River sockeye salmon (Oncorhynchus nerka) be designated as a “stock of management concern” in October 2020. A management concern is defined as “a concern arising from a chronic inability, despite use of specific management measures, to maintain escapements for a salmon stock within the bounds of the SEG [sustainable escapement goal], BEG [biological escapement goal], OEG [optimum escapement goal], or other specified management objectives for the fishery.” Klukshu River sockeye salmon escapements have been below the lower bound of the current BEG range in 4 of the last 5 years, 2016–2020. Klukshu River is a tributary of the Alsek River and is entirely within Yukon, Canada. Klukshu River sockeye salmon are harvested primarily in a commercial set gillnet fishery that operates in the lower portions of the Alsek River and in Dry Bay in the U.S. and in a Champagne–Aishihik First Nation Aboriginal fishery that takes place in or near the Klukshu River in Canada. Alsek River salmon fisheries are managed under the provisions of the Pacific Salmon Treaty (PST) and management actions since 2018 have been designed to reduce harvest of Klukshu River sockeye salmon.
Author: Julie Bednarski Publisher: ISBN: Category : Fish populations Languages : en Pages : 64
Book Description
Since 1967 the Alaska Department of Fish and Game, Division of Commercial Fisheries, has operated a stock assessment program to estimate escapements and harvests of Chilkat sockeye salmon (Oncorhynchus nerka). Sockeye salmon were counted through a weir near the outlet of Chilkat Lake, and age, length, and sex data were collected and analyzed each year. Since 1994, mark-recapture studies were conducted to estimate Chilkat sockeye salmon escapements. Since the start of the 2008 season, DIDSON sonar has been used at the weir site to directly enumerate adult sockeye salmon escapement into Chilkat Lake. Visual scale pattern analysis was conducted to determine the proportion of Chilkat sockeye salmon harvested annually in the District 15 commercial drift gillnet fishery. In addition, limnological sampling was conducted in Chilkat Lake and analyzed each year. The intent of this report was to review Chilkat sockeye salmon stock assessment data from 1971 to 2016. The visual and DIDSON weir counts provide an index of escapement; however concerns regarding mark-recapture as a reliable index of abundance lead us to recommend eliminating mark-recapture studies in 2017 and, instead, maintain the DIDSON to estimate escapement into Chilkat Lake. We also recommend reviewing the current Chilkat Lake biological escapement goal to ensure that the goal and escapement estimates are in the same units, which is currently based on mark-recapture units. An average of 77,800 Chilkat Lake sockeye salmon were harvested annually in the District 15 commercial drift gillnet fishery (1976-2016). A comparison of historical fish wheel counts to Chilkat Lake escapement estimates demonstrates that the fish wheel project provides a rough indication of Chilkat Lake run strength. Zooplankton samples from Chilkat Lake were composed primarily of one species of copepod (Cyclops columbianus) and three species of cladocerans (Bosmina longerostris, Daphnia longiremus, and Daphnia rosea).
Author: Kristin Courtney Publisher: ISBN: Category : Chinook salmon Languages : en Pages : 0
Book Description
The primary goals of this study are to estimate the number of Chinook salmon Oncorhynchus tshawytscha smolt leaving the Stikine River and the length and weight of these Chinook salmon smolt yearly from 2019-2021. In addition, the harvest and marine survival of adult Chinook salmon returning to the Stikine River in the corresponding 2017-2019 brood years will be estimated, as well as length and weight of coho salmon smolt yearly from 2019-2021. A modified Petersen 2-event mark-recapture project will be used to estimate smolt abundance, and a coded wire tag project in conjunction with harvest sampling programs will be used to estimate harvest. Chinook smolt will be marked with adipose fin clips and coded wire tags each spring. Marked fish will be recaptured through creel, port, and escapement sampling programs. The Alaska Department of Fish and Game and Fisheries and Oceans Canada use these data, along with adult escapement information, to make terminal and regional management decisions, and the Pacific Salmon Commission uses the data for coastwide management and stock assessment through the Transboundary and Chinook Technical Committees.
Author: Julie Bednarski
Author: Julie Bednarski
Author: Kristin Courtney
Author: Teresa M. Fish
Author: Mark J. Witteveen
Author: Kelly M. Krueger
Author: Andrew W. Piston
Author: Shelby M. Flemming
Author: Richard A. Hoffman (Biologist)
Author: Julie Bednarski
Author: Kristin Courtney