SNP genotype dataset from brown and anadromous trout

Populations of anadromous brown trout, also known as sea trout, have suffered recent marked declines in abundance due to multiple factors, including climate change and human activities. While much is known about their freshwater phase, less is known about the species’ marine feeding migrations. This situation is hindering the effective management and conservation of anadromous trout in the marine environment. Using a panel of 95 single nucleotide polymorphism markers we developed a genetic baseline, which demonstrated strong regional structuring of genetic diversity in trout populations around the English Channel and adjacent waters. Extensive baseline testing showed this structuring allowed the high-confidence assignment of known-origin individuals to the region of origin. This study presents new data on the movements of anadromous trout in the English Channel and southern North Sea. Assignment of anadromous trout sampled from 12 marine and estuarine localities highlighted contrasting ..., All individuals were genotyped at 95 biallelic single nucleotide polymorphism (SNP) loci (Osmond, King, Stockley, Launey, & Stevens, 2023) on the Fluidigm EP1 Genotyping System using 96.96 Dynamic Genotyping Arrays and scored using the Fluidigm SNP Genotyping analysis software., , # SNP genotype dataset from brown and anadromous trout

[https://doi.org/10.5061/dryad.1ns1rn92w](https://doi.org/10.5061/dryad.1ns1rn92w)

Data for trout (*Salmo trutta*) samples genotyped at 95 single nucleotide polymorphism (SNP) markers (Osmond et al. 2023). Data consists of 3067 baseline trout samples, 435 known-origin individuals, and 371 anadromous trout caught in marine and estuarine areas.

## Description of the data and file structure

The data file is a Microsoft Excel file, in GenAlEx format (Peakall & Smouse 2006, 2012), containing six tabs: Baseline_sample_info, Baseline, Known_origin_sample_info, Known_origin_samples, Marine&Estuarine_sample_info, and Marine&Extuarine.

SNP data is coded as 1 - A, 2 - C, 3 - G, and 4 - T. Missing data is coded as zero.

### Tab: Baseline\_sample\_info

A table presenting details of the rivers and hatchery populations from which brown trout were sampled to construct the genetic baseline, including river code name, country, repo...