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- W4385658257 abstract "Fish hatcheries across North America release billions of fish into the wild every year to augment harvest opportunities in sport, commercial, and tribal fisheries, as well as to recover depressed populations. Despite these benefits, wild fish populations may be negatively affected when hatchery fish compete and/or hybridize with native species. Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi have decreased by 90% across their historic range; however, the Flathead River in Montana is a rangewide stronghold for these imperiled fish. The primary threat to Westslope Cutthroat Trout is hybridization with invasive Rainbow Trout O. mykiss , which leads to hybrid swarm formation and genomic extinction. We collected Rainbow Trout in Mill Creek, a tributary of the Flathead River, downstream from a hatchery that produces the species, and used otolith 87 Sr/ 86 Sr to determine whether individual fish were inadvertently introduced from the hatchery. Differences in 87 Sr/ 86 Sr among water samples from Mill Creek and the marine‐derived hatchery food provided high‐classification accuracy to determine the natal origins of Mill Creek Rainbow Trout. We found that 83 of the 106 Rainbow Trout collected (78%) were of hatchery origin. Otolith microstructure analysis indicated these fish had been in Mill Creek for ~1–32 weeks prior to capture. Our results illustrate the utility of otolith 87 Sr/ 86 Sr to identify hatchery fish in natural habitats and point to a source of invasive Rainbow Trout that pose conservation risks to native fishes in the drainage." @default.
- W4385658257 created "2023-08-09" @default.
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- W4385658257 date "2023-09-06" @default.
- W4385658257 modified "2023-09-27" @default.
- W4385658257 title "Inadvertent Hatchery Rainbow Trout <i>Oncorhynchus mykiss</i> Discovered in Native Westslope Cutthroat Trout <i>Oncorhynchus clarkii lewisi</i> Habitat: A Cautionary Tale" @default.
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- W4385658257 doi "https://doi.org/10.1002/fsh.10985" @default.
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