Genomic evidence for domestication selection in three hatchery populations of Chinook salmon, Oncorhynchus tshawytscha

Evolutionary Applications, Journal Year: 2024, Volume and Issue: 17(2)

Published: Feb. 1, 2024

Fish hatcheries are widely used to enhance fisheries and supplement declining wild populations. However, substantial evidence suggests that hatchery fish subject differential selection pressures compared their counterparts. Domestication selection, or adaptation the environment, poses a risk populations if traits specific success in environment have genetic component there is subsequent introgression between fish. Few studies investigated domestication on genomic level, even fewer done so parallel across multiple hatchery-wild population pairs. In this study, we low-coverage whole-genome sequencing investigate signals of three separate Chinook salmon,

Language: Английский

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Strongholds for Pacific salmon: A proactive conservation strategy for ecosystem health, food security, biodiversity, and climate resilience

Fisheries, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

ABSTRACT Nested within the linked global crises of biodiversity loss and climate change are threats to cultural ecological keystones such as Pacific salmon Oncorhynchus spp., a group species with widespread ecological, cultural, economic value. Wild can rally public support for ecosystem protection link place-based conservation efforts benefits. Realizing these benefits depends on leveraging broad advance forward-looking approaches that safeguard food security, biodiversity, resilience. Here we provide insights from multidecadal implementation proactive wild strategy at scale North Rim. This approach is necessary complement policies focused preventing extinction after populations habitats degraded it provides globally significant contributions targets including recent 30 × goals Convention Biological Diversity.

Language: Английский

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Genetic analysis of Missouri’s Topeka Shiners with implications for the propagation of understudied small-bodied freshwater fishes

Transactions of the American Fisheries Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 15, 2025

Abstract Objective Best practices for conservation hatcheries to conserve genetic diversity and minimize adaptation captivity have been established decades, but how apply them is not clear in every circumstance. As a growing number of aquatic species are propagated captive settings, addressing the fit these each system will help managers operate optimally while conserving hatchery resources. Small-bodied freshwater fish present unique set traits compared with that typically considered propagation (i.e., salmonids), including patchy distribution within watercourse. We examine reintroduction program supports Topeka Shiner Miniellus topeka, an endangered minnow Midwestern USA. Methods genotyped shiners from groups different histories (two reintroduced, three captive, two remnant populations) at 11 microsatellite loci diversity, structure, effective population size, evidence bottlenecks. also looked breeding structure by genetically assigning hatchery-reared young (n = 148) candidate parents. Results documented high levels among natural populations our study. noted lower bottlenecks groups. However, may support sufficient (>50) sizes minimal space. Conclusions Hatcheries avoid other small-bodied collecting wild broad area frequently incorporating into population. Within hatchery, we emphasize need reduce generational overlap stocking all production and/or subdividing populations.

Language: Английский

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A Review of Pacific Salmon Hatcheries in British Columbia, Canada, and Interactions With Natural Populations

Fisheries, Journal Year: 2024, Volume and Issue: 49(7), P. 303 - 318

Published: April 30, 2024

Pacific salmon Oncorhynchus spp. hatcheries in British Columbia (BC) have been the major activity of Salmonid Enhancement Program since 1977. However, present diminished abundance and loss fisheries BC called for a review hatchery effectiveness. The Salmon Foundation conducted resulting 15 reports publicly available on marine science website. includes evaluations effectiveness production, evidence interactions with natural populations (including rebuilding hatchery-produced salmon), future opportunities via genomics. Beyond estimation juvenile production contribution to catches spawning escapements, ability assess was limited. assessments provided few examples positive outcomes, but most were negative. lack comparative purely wild seriously limits interpretations hatchery–wild interactions. Future require more quantitative integrated salmon, open data sharing public or research, related studies could benefit from application new genomic technologies. This paper presents recommendations address these needs calls regularized reviews its net value sustainability BC's salmon.

Language: Английский

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Restricted inclusion of wild broodstock at a large hatchery does not result in detectable genetic differentiation in a supplemented coho salmon (Oncorhynchus kisutch) population

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(11), P. 1528 - 1546

Published: Oct. 11, 2024

Hatchery production is common in salmonid management for harvest and conservation. Many hatcheries employ integrated broodstock programs, where wild-origin fish are included as uni- or bi-directional gene flow between wild hatchery components of the population encouraged. Such approaches often assume that opportunistically obtained meet genetic goals minimizing hatchery–wild differentiation maintaining diversity. This may be incorrect if fine-scale spatial structure exists. Here we investigate consequences such operations coho salmon ( Oncorhynchus kisutch) a small river system featuring large program. We do so using 11 082 SNPs scored hatchery-origin collected throughout system. found no evidence fish, lowered diversity among sampled In addition, did not detect inbreeding. Collectively, these results consistent with current practices meeting program adequately sampling present although they slightly reduce effective size combined population.

Language: Английский

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