Estimation of Chum Salmon Abundance, Migration Timing, and Spawning Distribution in the Fish River Complex, Norton Sound, Alaska, 2002-2004 PDF Download

Author: Gary L. Todd
Publisher:
ISBN:
Category : Biotelemetry
Languages : en
Pages : 38

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Author: Sean Larson
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 16

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Book Description
Summer chum salmon (Oncorhynchus keta) in the Yukon River support robust commercial and subsistence fisheries; however, fishery managers have had incomplete information about their run timing, spawning distribution, stock composition, and abundance. To address this, a radiotelemetry study was implemented on summer chum salmon in 2014 and 2015. A total of 1,232 (2014) and 1,199 (2015) summer chum salmon were fitted with radio transmitters. Radiotagged summer chum salmon were mapped, travel rates were estimated, and proportions of tagged fish recovered within different tributaries were determined. Basic mark-recapture assumptions were tested and abundance above the tagging site was estimated. Summer chum salmon were found to be widely distributed within the Yukon River drainage. Although a few tagged fish were observed in most locations, roughly 50% of tagged fish were observed in the Anvik, Koyukuk, and Bonasila rivers each year. Summer chum salmon destined for upper river spawning areas traveled faster than those to lower river areas. Summer chum salmon tended to recover quickly after being tagged, and traveled relatively fast within the mainstem Yukon River, but slowed down after entering their spawning tributaries. The 2014 mark-recapture abundance estimate was about 2,100,000 fish, which corresponded with summer chum salmon passage at the mainstem Yukon River sonar near Pilot Station. The 2015 mark-recapture abundance estimate was also about 2,100,000 fish, which was larger than the summer chum salmon passage at the sonar near Pilot Station. Results from this study help to evaluate sonar passage estimates and provide fishery managers with more detailed information about distribution and migratory patterns of individual summer chum salmon stocks within the Yukon River drainagewide population.

Author: Luke Henslee
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 32

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Historical research and local knowledge suggest that salmon vulnerable to harvest by fisheries in Subdistricts 5 and 6 of the Norton Sound management area represent a mixed stock, with unique populations migrating through marine waters and into spawning streams throughout the area and beyond. Incomplete understanding of salmon harvest composition and migration characteristics in Norton Sound has constrained managers’ ability to direct stock-specific persecution of fisheries. Consequently, fisheries in Subdistricts 5 and 6 are managed as a single unit and salmon are assigned to stocks based on the subdistrict in which they were harvested. This strategy has raised concern among local stakeholders that proportional harvest rates are being obscured and salmon caught in Subdistricts 5 and 6 could be bound for spawning streams in other subdistricts in the Norton Sound area. This project will use acoustic telemetry to address the critical management assumption that chum and coho stocks vulnerable to harvest in Subdistricts 5 and 6 are bound for spawning streams within those subdistricts and should be managed concurrently. This project will attempt to mimic the timing and location of nearshore salmon fisheries in Subdistricts 5 and 6 to tag chum and coho salmon such that the tagged fish are reasonably representative of the available mixed stocks. Sequential acoustic detection of tagged salmon by coastal marine and inriver hydrophone receivers will be used to estimate the spawning distribution of mixed stocks and describe spatiotemporal characteristics of nearshore migration. Results of this project are intended to inform management decisions by clarifying salmon stocks available for harvest in subdistricts 5 and 6 and stock-specific migration characteristics through those subdistricts so that stocks with harvestable surpluses can be targeted while minimizing impacts to less productive stocks.

Author: Jeffrey L. Estensen
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 21

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Category : Chinook salmon
Languages : en
Pages : 178

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A cooperative study involving the Department of Fisheries and Oceans Canada, the Alaska Department of Fish and Game, and the Taku River Tlingit First Nation was conducted to estimate the number of spawning Chinook salmon Oncorhynchus tshawytscha in the Taku River in 2003 with a mark-recapture experiment. Fish were captured at Canyon Island on the lower Taku River with fish wheels from May through August and were individually marked with back-sewn, solid-core spaghetti tags. All tagged fish were also batch marked with an opercle punch plus removal of the left axillary appendage. Sampling on the spawning grounds in tributaries was used to estimate the fraction of the population that had been marked. The estimated spawning abundance of small Chinook salmon ( 400 mm long; mid-eye to fork of tail) was 3,489 (SE = 1,052). Spawning abundance of medium-size Chinook salmon (401-659 mm) was estimated to be 16,780 (SE = 2,274). Finally, spawning abundance of large-size fish (= 660 mm) was estimated to be 36,435 (SE = 6,705), and the estimated total of all fish was 56,704 (SE = 7,158). The sum of the peak aerial survey counts of large spawning Chinook salmon conducted at five index tributaries of the Taku River was 16% of the mark-recapture estimate. Age 1.3 fish (1998 brood year) constituted an estimated 40% of the spawning population, followed by age 1.2 fish (1999 brood year), which constituted an estimated 29% of the population

Author: Richard G. Bakkala
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 100

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Author: Matthew J. Nemeth
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 76

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Fecundity (the number of eggs produced by a female fish) was measured for chum and coho salmon in the Unalakleet River in 2002, 2003, and 2004 and for chum salmon in the Fish River (which empties into Golovin Bay) in 2004. Fecundity was related to each year, other regions, body length, run timing, fish age, and standard size.

Author: Peter Mallon Cleary
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 52

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In 2009, the Alaska Department of Fish and Game began a 4-year spawning distribution and abundance estimation study in response to concerns over the status of the Susitna River chum (Oncorhynchus keta) and coho (O. kisutch) salmon stocks. This report summarizes results of mark-recapture abundance and distribution assessments completed during 2011. Four fish wheels were used to capture and tag chum and coho salmon with dart tags at river mile (RM) 22 in the Susitna River in July and August 2011. Two fish wheels were used at RM 7 in the Yentna River and 2 fish wheels were used at RM 34 in the mainstem Susitna River to sample salmon for tags. Estimated abundance of chum salmon was 1,473,969 (SE 123,933) fish for the mainstem Susitna River and 278,063 (SE 42,780) fish for the Yentna River. Estimated abundance of coho salmon was 131,878 (SE 24,146) fish for the mainstem Susitna River and 84,677 (SE 9,981) fish for the Yentna River. A total of 734 radio tags were placed in chum and coho salmon. Their movements were tracked using 6 ground tracking stations, 7 aerial surveys of the mainstem Susitna River, 6 aerial surveys of the Yentna River, and 3 drainagewide aerial surveys. All but 31 of the radio tags were relocated and 635 (86.5%) were assigned a putative spawning location. Both chum and coho salmon exhibited bank orientation at the tagging site.

Author: Jeffrey L. Estensen
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 30

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This document reports on the second of a 3-year project using radiotelemetry mark and recapture methods to determine the proportion of chum salmon, Oncorhynchus keta, migrating into North River and above a proposed weir site on Unalakleet River, and to estimate total Unalakleet drainage abundance.

Author: Matthew J. Nemeth
Publisher:
ISBN:
Category : Chum salmon
Languages : en
Pages : 68

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Book Description
Fecundity (the number of eggs produced by a female fish) of chum and coho salmon returning to the Unalakleet River was measured to determine initial fecundity estimates for the Norton Sound region. Unalakleet River chum and coho salmon had high actual fecundities compared to populations reported in literature, and coho salmon had high relative fecundities after accounding for body length.