Yakima/Klickitat Fisheries Project Monitoring and Evaluation, Final Report For the Performance Period May 1, 2008 through April 30, 2009.

Sampson, Melvin R.

doi:10.2172/965258

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…As inbreeding depression can be exacerbated under stressful conditions (Armbruster & Reed, ), it is possible that inbred fish in the F 4 generation experienced unusually high mortality after their release from the hatchery, perhaps due to the anomalous warm‐water mass (i.e., “the Blob”) that first appeared in the northeastern Pacific Ocean in 2013 (the last year at sea for fish from the F 4 generation) and had negative ecological impacts throughout the region (Cavole et al, ). However, while estimates of smolt‐to‐adult returns for CESRF Chinook salmon indicate a low survival rate of the F 4 generation, the P 1 and F 2 generations had similarly low survivals (Sampson, Fast, & Bosch, ).…”

Section: Discussionmentioning

confidence: 99%

Genomic and phenotypic effects of inbreeding across two different hatchery management regimes in Chinook salmon

et al. 2020

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Genomic approaches permit direct estimation of inbreeding and its effect on fitness. We used genomic‐based estimates of inbreeding to investigate their relationship with eight adult traits in a captive‐reared Pacific salmonid that is released into the wild. Estimates were also used to determine whether alternative broodstock management approaches reduced risks of inbreeding. Specifically, 1,100 unlinked restriction‐site associated (RAD) loci were used to compare pairwise relatedness, derived from a relationship matrix, and individual inbreeding, estimated by comparing observed and expected homozygosity, across four generations in two hatchery lines of Chinook salmon that were derived from the same source. The lines are managed as “integrated” with the founding wild stock, with ongoing gene flow, and as “segregated” with no gene flow. While relatedness and inbreeding increased in the first generation of both lines, possibly due to population subdivision caused by hatchery initiation, the integrated line had significantly lower levels in some subsequent generations (relatedness: F2–F4; inbreeding F2). Generally, inbreeding was similar between the lines despite large differences in effective numbers of breeders. Inbreeding did not affect fecundity, reproductive effort, return timing, fork length, weight, condition factor, and daily growth coefficient. However, it delayed spawn timing by 1.75 days per one standard deviation increase in F (~0.16). The results indicate that integrated management may reduce inbreeding but also suggest that it is relatively low in a small, segregated hatchery population that maximized number of breeders. Our findings demonstrate the utility of genomics to monitor inbreeding under alternative management strategies in captive breeding programs.

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Section: Discussionmentioning

confidence: 99%

Genomic and phenotypic effects of inbreeding across two different hatchery management regimes in Chinook salmon

et al. 2020

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“…This program has significantly enhanced the number of spring Chinook salmon returning to the upper Yakima River (Sampson et al 2009). However, hatchery conditions have inadvertently increased the number of yearling precocious males in the upper Yakima River.…”

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confidence: 99%

Breeding success of four male life history types of spring Chinook Salmon spawning in an artificial stream

et al. 2011

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In 1997 the Cle Elum Supplementation Research Facility was established to enhance spring Chinook salmon returning to the upper Yakima River, Washington State. This effort increased spring Chinook abundance, yet conditions at the hatchery also significantly elevated the occurrence of jacks and yearling precocious males. The potential genetic effect that a large influx of early maturing males might have on the upper Yakima River spring Chinook population was examined in an artificial stream. Seven independent groups of fish were placed into the stream from 2001 through 2005. Males with four different life history strategies, large anadromous, jacks, yearling precocious, and sub-yearling precocious were used. Their breeding success or ability to produce offspring was estimated by performing DNA-based pedigree assessments. Large anadromous males spawned with the most females and produced the greatest number of offspring per mate. Jacks and yearling precocious males spawned with more females than sub-yearling precocious males. However, jacks, yearling and sub-yearling precocious males obtained similar numbers of fry per mate. In the test groups, large anadromous males produced 89%, jacks 3%, yearling precocious 7%, and sub-yearling precocious 1% of the fry. These percentages remained stable even though the proportion of large anadromous males in the test groups ranged from 48% to 88% and tertiary sex ratios varied from 1.4 to 2.4 males per female. Our data suggest that large anadromous males generate most of the fry in natural settings when half or more of the males present on a spawning ground use this life history strategy.

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Yakima/Klickitat Fisheries Project Monitoring and Evaluation, Final Report For the Performance Period May 1, 2008 through April 30, 2009.

Cited by 2 publications

References 5 publications

Genomic and phenotypic effects of inbreeding across two different hatchery management regimes in Chinook salmon

Genomic and phenotypic effects of inbreeding across two different hatchery management regimes in Chinook salmon

Breeding success of four male life history types of spring Chinook Salmon spawning in an artificial stream

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