Inadvertent Hatchery Rainbow Trout Oncorhynchus mykiss Discovered in Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi Habitat: A Cautionary Tale
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 formore »
- Authors:
-
- Montana Fish Wildlife and Parks, 490 N. Meridian Rd. Kalispell MT 59901
- Pacific Northwest National Laboratory Richland WA
- Pacific Northwest National Laboratory Richland WA, Mainstem Fish Research Port Townsend WA
- Mainstem Fish Research Port Townsend WA
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE; Bonneville Power Administration (BPA)
- OSTI Identifier:
- 1998799
- Alternate Identifier(s):
- OSTI ID: 2208858; OSTI ID: 2229534
- Report Number(s):
- PNNL-ACT-SA-10716
Journal ID: ISSN 0363-2415
- Grant/Contract Number:
- AC05-76RL01830; 199101903
- Resource Type:
- Published Article
- Journal Name:
- Fisheries
- Additional Journal Information:
- Journal Name: Fisheries Journal Volume: 48 Journal Issue: 11; Journal ID: ISSN 0363-2415
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES
Citation Formats
Bourret, Samuel L., Janak, Jill M., Linley, Tim J., Nims, Megan K., and McMichael, Geoffrey A. Inadvertent Hatchery Rainbow Trout Oncorhynchus mykiss Discovered in Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi Habitat: A Cautionary Tale. United States: N. p., 2023.
Web. doi:10.1002/fsh.10985.
Bourret, Samuel L., Janak, Jill M., Linley, Tim J., Nims, Megan K., & McMichael, Geoffrey A. Inadvertent Hatchery Rainbow Trout Oncorhynchus mykiss Discovered in Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi Habitat: A Cautionary Tale. United States. https://doi.org/10.1002/fsh.10985
Bourret, Samuel L., Janak, Jill M., Linley, Tim J., Nims, Megan K., and McMichael, Geoffrey A. Wed .
"Inadvertent Hatchery Rainbow Trout Oncorhynchus mykiss Discovered in Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi Habitat: A Cautionary Tale". United States. https://doi.org/10.1002/fsh.10985.
@article{osti_1998799,
title = {Inadvertent Hatchery Rainbow Trout Oncorhynchus mykiss Discovered in Native Westslope Cutthroat Trout Oncorhynchus clarkii lewisi Habitat: A Cautionary Tale},
author = {Bourret, Samuel L. and Janak, Jill M. and Linley, Tim J. and Nims, Megan K. and McMichael, Geoffrey A.},
abstractNote = {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.},
doi = {10.1002/fsh.10985},
journal = {Fisheries},
number = 11,
volume = 48,
place = {United States},
year = {Wed Sep 06 00:00:00 EDT 2023},
month = {Wed Sep 06 00:00:00 EDT 2023}
}
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