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106 results for “Salmon River”

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dryad32/100

Data from: Genetic composition of the Warm Springs River Chinook Salmon population maintained following eight generations of hatchery production

Balancing the disparate objectives of fishery augmentation and conservation of an endemic population presents a substantial challenge. In the case of Warm Springs National Fish Hatchery (Warm Springs Hatchery), strategies for achieving both objectives included incorporation of natural fish into the hatchery broodstock and restricting proportions of hatchery fish on the spawning grounds. The hatchery has been more successful in implementing the latter, however, than the former. We analyzed seventy-six SNP markers in Spring Chinook Salmon O. tshawytscha collected from the Warm Springs River in 1976 – 1977 (prior to hatchery produciton) and 2001-2011 (post-hatchery) to examine whether the genetic characteristics of the endemic population had changed during that time. Pre- and post- hatchery collections clustered together when compared to Round Butte Hatchery (a nearby segregated program) and other Columbia River populations. The difference between pre- and post- hatchery collections was non-significant (AMOVA), but post hatchery samples exhibited significantly lower He. We observed some evidence of reduced effective size (Ne) and increased genetic drift in fish produced at Warm Springs Hatchery (relative to natural-origin fish), and even stronger evidence in fish produced at Round Butte Hatchery. We conclude that natural-origin fish returning to the Warm Springs River form a distinct group within the Interior Columbia Basin Spring-run lineage and have changed very little over the past eight generations. We further speculate that differences between hatchery- and natural- origin fish at Warm Springs Hatchery are expected to increase if hatchery operations remain static (little integration of natural-origin fish and incorporation of Round Butte Hatchery fish in broodstock).

opencc-zeroDec 2013View details →

zenodo32/100

Escapement and ASL data of salmon in the Chena River, Alaska

This data was collected as part of the AKSSF funding #52011 awarded to the Alaska Department of Fish and Game, Sportfish division in Region III. Chinook salmon are an important subsistence resource throughout the Yukon River drainage and the Chena River supports one of the largest spawning populations in the Alaska portion. This project will estimate Chinook and chum salmon by visually counting fish as they pass over a continuous band of white fabric panels strung across the river bottom on the upstream side of the Moose Creek Dam. A DIDSON sonar unit and an ARIS sonar unit will be deployed upstream of the tower site on both sides of the river to ensonify the river at all times and record the number of migrating salmon throughout the run. A mixture model will be used to estimate Chinook and chum salmon during extended periods of high water when tower counts cannot be completed. In addition to enumeration, carcasses of spawned-out Chinook and chum salmon will be collected during the last week of July through the first two weeks of August to estimate the ASL composition of the escapement. The citation for the operational plan for this project is below:  Matter, A. N., and M. Tyers. 2019. Chinook salmon escapement in the Chena and Salcha Rivers and Coho salmon escapement in the Delta Clearwater River, 2019-2023. Alaska Department of Fish and Game, Regional Operational Plan ROP.SF.3F.2019.03, Anchorage.

opencc-by-3.0-usApr 2022View details →

dryad32/100

Data from: The origins of Atlantic salmon (Salmo salar L.) re-colonizing the River Mersey in northwest England

By the 1950s, pollution had extirpated Atlantic salmon in the river Mersey in northwest England. During the 1970s, an extensive restoration program began and in 2001, an adult salmon was caught ascending the river. Subsequently, a fish trap was installed and additional adults are now routinely sampled. In this study, we have genotyped 138 adults and one juvenile salmon at 14 microsatellite loci from across this time period (2001–2011). We have used assignment analysis with a recently compiled pan-European microsatellite baseline to identify their most probable region of origin. Fish entering the Mersey appear to originate from multiple sources, with the greatest proportion (45–60%, dependent on methodology) assigning to rivers in the geographical region just north of the Mersey, which includes Northwest England and the Solway Firth. Substantial numbers also appear to originate from rivers in western Scotland, and from rivers in Wales and Southwest England; nonetheless, the number of fish originating from proximal rivers to the west of the Mersey was lower than expected. Our results suggest that the majority of salmon sampled in the Mersey are straying in a southerly direction, in accordance with the predominantly clockwise gyre present in the eastern Irish Sea. Our findings highlight the complementary roles of improving water quality and in-river navigability in restoring salmon to a river and underlines further the potential benefits of restoration over stocking as a long-term solution to declining fish stocks.

opencc-zeroDec 2012View details →

dryad32/100