Author: Kristin Courtney
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 0
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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: Kristin Courtney
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 45
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Book Description
The inriver abundance of large (fish =660 mm mid eye to tail fork [METF] length) Chinook salmon Oncorhynchus tshawytscha above the U.S./Canada border (border) will be estimated annually from 2022 to 2024 in the Stikine River, near Wrangell, Alaska. A modified Petersen 2-event mark–recapture project will be conducted using drift gillnets to mark large Chinook salmon in the first event, and collection of samples in the Canadian commercial fishery, Little Tahltan River video weir, and on the spawning grounds will serve as the second event. Additional project objectives are to a) estimate the annual spawning escapement of large Chinook salmon above the border, b) estimate the age, sex, and length composition of both the inriver run and spawning escapement, and c) estimate the proportion of large radiotagged Chinook salmon that cross the border. The Alaska Department of Fish and Game (ADF&G) and Fisheries and Oceans Canada (DFO) use these data to make terminal and regional management decisions, and the Pacific Salmon Commission (PSC) uses the data for coastwide management and stock assessment through the Chinook Technical Committee (CTC 2021).
Author: Nathan Frost
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
This plan describes the coded-wire-tagging of juvenile Chinook salmon Oncorhynchus tshawytscha on the Unuk River for the 2021 and 2022 brood years, which covers the coded-wire-tagging of parr in fall of 2022 and 2023 and smolt in spring of 2023 and 2024, and sampling returning adults for age, sex, length, and coded wire tags in escapement from the 2024 through 2029 return years. This study provides estimates of smolt and parr abundance, overwinter (freshwater) survival, mean lengths of juveniles, and harvest information of Chinook salmon originating from the Unuk River in Southeast Alaska. A separate project will be conducted on the Unuk River that employs aerial and foot survey peak counts to estimate large (≥ 660 mm mid eye to fork of tail length) adult Chinook salmon returning to the river in 2022 and 2023. The primary goals of this and the companion study are to estimate inriver run size, total run size, marine harvest and exploitation rates, harvest distribution, smolt and parr abundance, marine survival (smolt to adult) and overwinter survival (parr to smolt). The Alaska Department of Fish and Game uses this information to make local and regional management decisions and to evaluate the Unuk River Chinook salmon escapement goal, and the Pacific Salmon Commission uses the data for coastwide management and stock assessment through the Chinook Technical Committee.
Author: Philip Richards
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 0
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Book Description
The abundance of Alsek River Chinook salmon Oncorhynchus tshawytscha (fish age-1.2 and older) and sockeye salmon Oncorhynchus nerka (fish 350 mm mid eye tail fork length [METF] or greater) will be estimated, in 2022, using 2-event mark–recapture methods. The mark–recapture study will occur upstream of the commercial set gillnet fishery at river kilometer 19 (hereafter referred to as “Kilometer 19”). Immigrating Chinook and sockeye salmon caught at Kilometer 19 will be marked before being released. The second sampling event will consist of inspecting Chinook and sockeye salmon for marks upriver at Klukshu River and Village Creek enumeration projects, as well as on various Alsek River salmon spawning grounds, hereafter referred to as “headwaters”. Age, sex, and length composition of Chinook and sockeye salmon will also be estimated. Tissues will be collected from all sockeye salmon captured at Kilometer 19 for a mixed stock genetic analysis and for a genetic mark–recapture expansion of the Klukshu and Nesketahin stocks. The Alaska Department of Fish and Game, Fisheries and Oceans Canada, and the Champagne and Aishihik First Nations use these data to make terminal and regional management decisions. The Pacific Salmon Commission uses the Chinook salmon data for coastwide management and stock assessment through the Chinook Technical Committee.
Author: Julie Bednarski
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 18
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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 : Fish populations
Languages : en
Pages : 0
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Book Description
Estimates of the inriver abundance of Taku River sockeye salmon, Oncorhynchus nerka, are needed to assess the achievement of the spawning escapement goal and international harvest sharing arrangements for stocks specified by the U.S./Canada Pacific Salmon Treaty (Treaty). The Taku River capture-recapture project has been conducted annually since 1984 as a joint U.S./Canada program involving the Alaska Department of Fish and Game (ADF&G), Fisheries and Oceans Canada (DFO), and the Taku River Tlingit First Nation (TRTFN). The objectives of the studies are to provide estimates of the inriver abundance of Taku River sockeye salmon and to document biological characteristics (migratory timing, migratory rates, final fates, and age, sex, and size composition) of stocks. Sockeye salmon are captured via fish wheels at Canyon Island on the U.S. side of the border and the recapture consists of sampling (inspecting) sockeye salmon for tags above border in the Canadian commercial and assessment fisheries. Tagged-to-untagged ratios of salmon harvested in the Canadian inriver gillnet fisheries are used to develop the estimates of the inriver abundance of sockeye salmon. Additionally, ADF&G, in cooperation with DFO and TRTFN, will continue a sockeye salmon radiotelemetry study on the Taku River to clarify recent insights into key assumptions of annual Taku River sockeye salmon capture–recapture studies that have potential to influence abundance estimates. An array of fixed towers throughout the drainage and fixed-wing aerial surveys will be used to track radiotagged sockeye salmon to determine final fates in the drainage, to determine annual fish dropout rates (defined as any fish tagged during event one at the Canyon Island fish wheels that did not cross the border and therefore was not available for recapture in event two of the capture–recapture project), and to estimate the proportion of mainstem and lake spawners.
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 60
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Book Description
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 38
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Susitna River drainage were determined via a capture-recapture experiment, which was conducted using radio tags, fish wheels, and weirs in 2008.
Author: Richard Yanusz
Publisher:
ISBN:
Category : Escapement (Fisheries)
Languages : en
Pages : 44
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Book Description
Estimates of sockeye salmon Oncorhynchus nerka escapement to the Susitna River were determined via a capture-recapture experiment, which was conducted using radio tags, fish wheels, and weirs in 2007.
Author: David M. Shackleton
Publisher: UBC Press
ISBN: 9780774807289
Category : Nature
Languages : en
Pages : 276
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Book Description
Hoofed mammals (ungulates) are the most abundant large mammals in the world. They are also plentiful in British Columbia, which is home to nine wild native species: moose, elk, caribou, bison, mountain goat, two species of deer and two of sheep. There are also several introduced species. In Hoofed Mammals of British Columbia, David Shackleton presents a comprehensive summary of the most up-to-date information on these ungulates. In the well-illustrated introduction, he discusses their evolution and biology, survival adaptations, and social organization. He also covers conservation issues, tracking, and taxonomy. In the species accounts, he describes each species and subspecies and discusses their natural history: habitat, diet, behaviour, reproduction, life expectancy, and mortality factors, and predators. Each account includes a distribution map and data on taxonomy, recent population estimates, conservation status, and traditional aboriginal use. Excellent illustrations and two keys help identify each species by its external features or its skull. Hoofed Mammals of British Columbia is the third of six handbooks on the mammals of British Columbia, a Royal B.C. Museum project to update and expand the classic treatment by Ian McTaggart-Cowan and Charles Guiguet, The Mammals of British Columbia, last revised in 1965.
