Sockeye Salmon Stock Status and Escapement Goal for Hugh Smith Lake in Southeast Alaska PDF Download

Author: Harold J. Geiger
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 71

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Author: John E. Clark
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 68

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"Age class composition, spawner abundance, and contributions of four coho salmon Oncorhynchus kisutch stocks have been monitored ... These data were reviewed and summarized to develop brood tables ... Paired data points consisting of estimated escapements and estimated total returns from these escapements were used to develop spawner-recruit curves"--Abstract.

Author: Steven C. Heinl
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 46

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Summarizes escapement and harvest information of sockeye salmon in the southeast Alaska and Yakutat areas.

Author: Douglas Murrell Eggers
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 48

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Author: Douglas Murrell Eggers
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 46

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This work represents a review of escapement goals for sockeye salmon stocks (Oncorhynchus nerka) in the Southeast Alaska and Yakutat area.

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: 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: Rich Brenner
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 34

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Book Description
Chilkoot Lake, located in upper Lynn Canal near the city of Haines, supports one of the largest runs of sockeye salmon (Oncorhynchus nerka) in southeast Alaska. This stock is currently managed as a sustainable escapement goal range with a lower bound of 38,000 and an upper bound of 86,000 spawners. Escapement is monitored by the Alaska Department of Fish and Game with a weir on the Chilkoot River, and stock of origin from the District 15 commercial drift gillnet fishery harvest is determined using scale pattern analysis. We used Ricker spawner-recuit models in a Bayesian framework to fit data from brood years 1976-2010. Given significant autocorrelation at lag-1, we chose an autoregressive Ricker model for this assessment. Based on model results, maximum sustainable yield would be achieved with an escapement of approximately 52,900 sockeye salmon (median of spawning abundance at maximum sustained yield), and a range of 45,000-60,000 spawners would result in a greater than 80% probability of achieving at least 90% of maximum sustainable yield. This range of escapements fits within the current escapement goal range and, given considerable uncertainty in parameter estimates, we do not recommend changes to the goal at this time. However, some large escapements since 2012 will provide contrast to the existing data once the resulting recruits can be enumerated; thus, we recommend reassessing this escapement goal prior to the Alaska Board of Fisheries meeting in 2021.

Author: Andrew W. Piston
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 44

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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.