Fish Passage Center 2007 Annual Report.

DeHart, Michele

doi:10.2172/962635

Cited by 2 publications

(1 citation statement)

References 4 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The adult, adipose‐clipped, hatchery‐origin steelhead in the Klickitat River were found to be mostly from the Skamania Hatchery, as expected given the high numbers of juveniles that are released in the subbasin for harvest opportunities of returning adults (National Marine Fisheries Service 2017). However, adipose‐clipped, and adipose‐present hatchery‐origin strays were detected from hatcheries operating outside the Klickitat River, most of them from Snake River hatcheries that are the predominant source of all hatchery‐origin steelhead above Bonneville Dam (Hess et al 2016a; Steele et al 2019; DeHart 2020). For the adult steelhead, both adipose‐present hatchery‐origin steelhead (i.e., adipose‐present, PBT‐assigned fish) and adipose‐present putatively natural‐origin steelhead were observed in spawning reaches of the Klickitat River (Zendt et al 2021).…”

Section: Discussionmentioning

confidence: 99%

Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing

Collins,

Hess,

Bechtol

et al. 2023

N American J Fish Manag

View full text Add to dashboard Cite

ObjectiveSalmonids with a complex life history variation present challenges for conservation management, but genetic approaches alongside fisheries monitoring can address questions regarding the viability of the natural populations.MethodsWe genotyped adult (n = 3108) and juvenile (n = 2624) samples of steelhead Oncorhynchus mykiss that were collected in the Klickitat River, Washington, USA at traps in the lower drainage to examine tributary level productivity, straying from outside sources, and variation in adult migration timing.ResultGenetic assignment of steelhead from this system indicated that the majority were produced within or near tributaries of the middle Klickitat River (juvenile mean = 72.8%; adult mean = 87.3%). Analyses with parentage‐based tagging identified that most hatchery‐origin adults were assigned to the Skamania Hatchery (80.8%), as expected, since this has been the release stock for decades within the Klickitat River drainage. Hatchery‐origin adults were also identified from programs operating outside the Klickitat River, which were primarily strays from Snake River hatcheries. Most natural‐origin steelhead were assigned to the Klickitat River, but there were also natural‐origin fish identified as strays from other regions of the Columbia River (22.3% of natural returns). We also examined genes known to be associated with migration timing in adult steelhead observed at the trap and observed a strong relationship between migration date and alleles for early and late migration, but individual outliers were detected across seasons.ConclusionOur results indicate that genetic variation of steelhead in the Klickitat River has been influenced by hatchery programs as well as natural‐origin straying from other subbasins, but genetic diversity remains high throughout the subbasin, and both early and late migration alleles are maintained. The genetic diversity present in Klickitat River steelhead may enable this Endangered Species Act listed (threatened) species to better adapt to stochastic environmental conditions compared to less diverse populations.

show abstract

Section: Discussionmentioning

confidence: 99%

Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing

Collins,

Hess,

Bechtol

et al. 2023

N American J Fish Manag

View full text Add to dashboard Cite

show abstract

Survival of Age‐0 Hatchery Summer‐Run Chinook Salmon is Enhanced by Early Release

Snow

2015

N American J Aquac

View full text Add to dashboard Cite

Subyearling (age-0) hatchery summer-run Chinook Salmon Oncorhynchus tshawytscha have been released into the Columbia River in mid-June from Wells Fish Hatchery, Washington, since 1993, but release-to-adult survival (SAR) under this strategy has been low. I used paired releases of four broods of coded-wiretagged age-0 Chinook Salmon released in mid-May (early release [ER] group) and mid-June (late release [LR] group) to evaluate whether advancing the release date could improve SAR. Additionally, passive integrated transponder tags implanted in a subsample of each release group were used to estimate emigration rate and release-to-McNary Dam survival of juvenile fish. Mean migration rate from release to McNary Dam was significantly faster for LR fish than for ER fish. No among-year difference in mean survival from release to McNary Dam was observed between ER and LR groups, although differences were observed within years. Mean overall SAR was significantly greater for ER fish than for LR fish. These results suggest that altering the release date of age-0 Chinook Salmon at Wells Hatchery would enhance return survival.

show abstract

Fish Passage Center 2007 Annual Report.

Cited by 2 publications

References 4 publications

Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing

Genetic monitoring of steelhead in the Klickitat River to estimate productivity, straying, and migration timing

Survival of Age‐0 Hatchery Summer‐Run Chinook Salmon is Enhanced by Early Release

Contact Info

Product

Resources

About