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Application of Genomic Offsets to Inform Freshwater Fisheries Management Under Climate Change
Anna S Jacquemart1, Anna Tigano1,2, Marika Kirstin Gale3
1Department of Biology The University of British Columbia Okanagan Kelowna British Columbia Canada.
Evolutionary Applications
|August 29, 2025
Summary
Genomic tools help manage freshwater fish like kokanee salmon amidst climate change. A new genotyping panel and analysis predict successful fish stocking locations, aiding biodiversity conservation efforts.
Area of Science:
- Conservation genetics
- Climate change adaptation
- Fisheries management
Background:
- Freshwater fish, such as kokanee salmon (Oncorhynchus nerka), are vulnerable to climate change impacts like extreme temperatures.
- Previous research identified environmentally associated single nucleotide polymorphisms (SNPs) and genomic offset as indicators of climate vulnerability in kokanee.
Purpose of the Study:
- To operationalize genomic data for fisheries management by developing a targeted genotyping panel.
- To assess the accuracy of the new panel against whole genome data.
- To apply donor and recipient importance (DI/RI) analysis for informing stocking decisions.
Main Methods:
- Development of a Genotyping-in-Thousands by sequencing (GT-seq) panel using environment-associated SNPs.
- Validation of the GT-seq panel's correlation with whole genome resequencing data under various climate scenarios.
- Application of DI/RI analysis to predict successful translocation of fish populations.
Main Results:
- A reduced GT-seq panel (616 SNPs) showed strong correlation with the full panel (1412 SNPs), even with new reference populations.
- DI/RI analysis identified southern British Columbia populations as having high potential for northward translocation.
- Candidate recipient lakes in the distribution center showed higher importance for stocking than peripheral locations.
Conclusions:
- Targeted genotyping panels can effectively operationalize genomic offset for fisheries management.
- DI/RI analysis provides valuable insights for optimizing fish stocking strategies under climate change.
- Integrating genomic predictions with management practices can enhance freshwater fish conservation.
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