Hugh Smith Lake Sockeye Salmon Stock Assessment, 2020 PDF Download
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Author: Teresa M. Fish
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
In 2020, 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 16,000 sockeye salmon smolt was tied for the 2nd lowest count on record. An estimated 48% of smolt were freshwater age-1 and 52% were freshwater age-2. The 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 the adult sockeye salmon escapement. The 2020 weir count of 3,860 adult sockeye salmon was below the optimal escapement goal range of 8,000–18,000 adult sockeye salmon and was the 9th lowest escapement since 1980. Age-2.2 fish were the most abundant age class, representing an estimated 40% of the total spawning population. Counts of live sockeye salmon in Buschmann Creek (not including mouth estimates) only exceeded 250 fish during 4 of 18 surveys from 19 August to 7 November (peak count 556 fish on 27 October). Counts of live sockeye salmon in Cobb Creek peaked at only 27 fish on 30 September and all other counts there were less than 20 fish. Reported subsistence harvest was 70 fish and accounted for an estimated 2% of the terminal run. The estimated minimum harvest rate in the District 101–108 commercial net fisheries was 38% in 2020.
Author: Teresa M. Fish
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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Book Description
In 2020, 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 16,000 sockeye salmon smolt was tied for the 2nd lowest count on record. An estimated 48% of smolt were freshwater age-1 and 52% were freshwater age-2. The 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 the adult sockeye salmon escapement. The 2020 weir count of 3,860 adult sockeye salmon was below the optimal escapement goal range of 8,000–18,000 adult sockeye salmon and was the 9th lowest escapement since 1980. Age-2.2 fish were the most abundant age class, representing an estimated 40% of the total spawning population. Counts of live sockeye salmon in Buschmann Creek (not including mouth estimates) only exceeded 250 fish during 4 of 18 surveys from 19 August to 7 November (peak count 556 fish on 27 October). Counts of live sockeye salmon in Cobb Creek peaked at only 27 fish on 30 September and all other counts there were less than 20 fish. Reported subsistence harvest was 70 fish and accounted for an estimated 2% of the terminal run. The estimated minimum harvest rate in the District 101–108 commercial net fisheries was 38% in 2020.
Author: Teresa M. Fish
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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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: Malika T. Brunette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 43
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Book Description
In 2019, long-term population studies designed to evaluate adult sockeye salmon abundance and juvenile production at Hugh Smith Lake continued. An estimated 25,000 sockeye salmon smolt were counted through the smolt weir and an estimated 56% of smolt were freshwater-age-1 and 43% were freshwater-age-2. The 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 the adult sockeye salmon escapement. The 2019 weir count of 2,241 adult sockeye salmon was below the optimal escapement goal range of 8,000-18,000 adult sockeye salmon and was the fourth lowest escapement since 1980. Age-1.3 adults were the most abundant adult age class, representing an estimated 82% of the total spawning population. Sockeye salmon spawn in 2 inlet streams, Buschmann Creek and Cobb Creek. Counts of live sockeye salmon in Buschmann Creek (not including mouth estimates) only exceeded 250 fish during peak spawn timing from 14 to 22 September (peak count 475 fish on 14 September). Counts of live sockeye salmon in Cobb Creek peaked at 56 fish on 15 September and all other counts were less than 25 fish. Reported subsistence harvest was 521 fish and accounted for an estimated 19% of the terminal run. The estimated minimum harvest rate in the District 101-108 commercial net fisheries was 77% in 2019.
Author: Malika T. Brunette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 49
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Book Description
In 2017 and 2018, long-term population studies designed to evaluate adult sockeye salmon abundance and juvenile production at Hugh Smith Lake continued. An estimated 80,000 sockeye salmon smolt were counted through the smolt weir in 2017, and 63,000 sockeye smolt were counted through the smolt weir in 2018. In 2017, an estimated 88% of smolt were freshwater age-1 and 12% were freshwater age-2. In 2018, an estimated 57% of smolt were freshwater age-1 and 42% were freshwater age-2. Biological data were collected to estimate the age, length, and sex composition of the adult sockeye salmon escapement, the escapement was counted through a weir, and a mark-recapture study was conducted to confirm the weir count. The 2017 weir count of 14,748 adult sockeye salmon fell within the optimal escapement goal range of 8,000-18,000 adult sockeye salmon. Conversely, the 2018 weir count of 2,039 adult sockeye salmon was the third lowest escapement since 1980 and well below goal. Age-1.3 adults were the most abundant adult age class to return in 2017, representing an estimated 78% of the total spawning population. Conversely, age-1.2 adults were the most abundant returning adult age class in 2018, representing an estimated 48% of the total spawning population. Numbers of fish observed spawning in Buschmann and Cobb creeks were extremely low during the normal peak spawn timing in 2018 due to extreme low water flow through most of September. Reported subsistence harvest in 2017 (617 fish) was the third largest harvest on record and the number of permit days fished was the highest on record. Conversely, reported subsistence harvest and participation dropped to very low levels in 2018 due to extremely low abundance. Estimated minimum harvest rates in the District 101-108 commercial net fisheries were 47% in 2017 and 66% in 2018.
Author: Harold J. Geiger
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 71
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Book Description
Author: Shelby M. Flemming
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 0
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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: Malika T. Brunette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 32
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Book Description
This report reviews stock assessment and long-term population studies designed to evaluate adult sockeye salmon abundance and juvenile production at Hugh Smith Lake.
Author: Justin T. Priest
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 0
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Book Description
"This project provides stock assessment information for Southeast Alaska coho salmon (Oncorhynchus kisutch) indicator stocks at Berners River and Hugh Smith Lake. Coho salmon smolt at the Berners River and Hugh Smith Lake are captured, implanted with a coded wire tag (CWT), sampled for age and length, adipose fin clipped, and released unharmed. Concurrent to smolt tagging, a project to collect scales of a known age requires capturing and implanting a CWT into coho salmon fry, later to be recovered as smolt and adults. Returning adult coho salmon are examined for the presence of CWTs, enumerated, and sampled for age, length, and sex. These data are used in combination with estimates of harvest of tagged fish by Alaska Department of Fish and Game port sampling and Mark, Tag and Age Laboratory programs to estimate a variety of parameters for the stocks. These programs, conducted continuously since the 1980s, provide detailed information on long-term population dynamics useful for establishing escapement goals and for managing commercial fisheries that target coho salmon."--Page 1
Author: Nicole L. Zeiser
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 48
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Book Description
The Chilkoot Lake sockeye salmon (Oncorhynchus nerka) run, which spawns near Haines, is one of the largest in Southeast Alaska and contributes substantially to harvests in the District 15 commercial drift gillnet fishery in Lynn Canal. This operational plan outlines objectives, methods, and timelines for conducting sockeye salmon stock assessment designed to (1) estimate annual escapement and harvest, (2) provide information for inseason fishery management, and (3) reconstruct runs and assess stock status. The Chilkoot Lake run is managed for a biological escapement goal of 38,000–86,000 fish, which is enumerated through a standard picket weir located just downstream of the lake outlet. Weir counts of sockeye salmon are compared to weekly escapement targets to determine inseason run strength. Genetic mixed stock analysis of weekly sockeye salmon harvests in the District 15 commercial drift gillnet fishery provides stock composition estimates that also guide inseason management of the fishery. Biological sampling, along with escapement enumeration and stock-specific harvest data, allows for total run reconstruction required for escapement goal review.
Author: Malika T. Brunette
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 32
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Book Description
This report reviews stock assessment and long-term population studies designed to evaluate adult sockeye salmon abundance and juvenile production at Hugh Smith Lake.
