Oncorhynchus clarkii x mykiss
Oncorhynchus clarkii x mykiss
(cutbow trout)
Native Hybrid
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Oncorhynchus clarkii x mykiss

Common name: cutbow trout

Identification: Rourke and Wallace (1978); Behnke (1992).

Size: 2.46 kg.

Native Range: Not applicable; artificial hybrid. Can occur "naturally" where both species come in contact through stocking.

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Nonindigenous Occurrences: According to Behnke (personal communication), these hybrids occur throughout the native range of the cutthroat trout including the states of Arizona, California, Colorado, Idaho, Montana, New Mexico, Nevada, Oregon, Utah, Washington, and Wyoming. A record-sized fish was caught in Spinney Mt. Reservoir in Hartzel, Park County, Colorado, in 1993 (International Game Fish Association 1994). Cutbow trout have been collected in the Arkansas, Colorado, Rio Grande, and Platte river drainages in Colorado (Walker 1993; Rasmussen 1998); Henry's Lake and Pend Orielle, Idaho (DeLorme Mapping 1992a; Idaho Fish and Game 1997); and in Hobart Creek Reservoir, Spooner Lake, Big Spring Reservoir, Blue Lakes, Squaw Creek Reservoir (DeLorme Mapping 1996b), and Pyramid Lake, Nevada (Insider Viewpoint 2001; Behnke, personal communication). Miller and Alcorn (1946) reported stockings of this hybrid in Clear Creek and Stoney Lake in Ormsby County, and in the Truckee River, Washoe county, Nevada, in the early 1900s. One fly fishing web page lists them as present in the Rio Grande Gorge in New Mexico (Martin 1995). This hybrid has been reported as common in Utah (Sigler and Miller 1963).

Means of Introduction: Intentionally stocked as sport fish.

Status: Maintained by stocking either the hybrid or a parent species where the other parent species naturally occurs (usually stocking the rainbow in cutthroat native range).

Impact of Introduction: Native cutthroat are being replaced by introduced rainbow trout through hybridization and competition. Where the two species naturally co-occur, they rarely hybridize (Sigler and Miller 1963; Behnke, personal communication). Seiler and Keeley (2009) showed that cutthroat trout had reduced growth rates in the presence of cutthroat-rainbow hybrids in laboratory experiments.

Remarks: Recorded from the Southwest as early as 1918 (Sigler and Miller 1963). Private hatcheries sell hybrids between rainbows and Snake River cutthroats (Behnke, personal communication). These two species do not hybridize in areas where both are native (Sigler and Miller 1963). Hybrid trout have not been stocked in Oklahoma (Pigg, personal communication).

References: (click for full references)

Insider Viewpoint. 2001. Fishing Records – Nevada. Insider Viewpoint Magazine. 3 pp.

Rasmussen, J.L. 1998. Aquatic nuisance species of the Mississippi River basin. 60th Midwest Fish and Wildlife Conference, Aquatic Nuisance Species Symposium, Dec. 7, 1998, Cincinnati, OH.

Seiler, S.M., and E.R. Keeley. 2009. Competition between native and introduced salmonid fishes: cutthroat trout have lower growth rate in the presence of cutthroat-rainbow trout hybrids. Canadian Journal of Fisheries and Aquatic Sciences 66:133-141.

Sigler, W.F., and R.R. Miller. 1963. Fishes of Utah. Utah Department of Fish and Game, Salt Lake City, UT.

Other Resources:
Fact Sheet for Oncorhynchus clarkii - USGS Nonindigenous Aquatic Species Database

Fact Sheet for Oncorhynchus mykiss - USGS Nonindigenous Aquatic Species Database

Author: Fuller, P.

Revision Date: 5/20/2013

Peer Review Date: 4/1/2016

Citation Information:
Fuller, P., 2018, Oncorhynchus clarkii x mykiss: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=904, Revision Date: 5/20/2013, Peer Review Date: 4/1/2016, Access Date: 1/24/2018

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.

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URL: https://nas.er.usgs.gov
Page Contact Information: Pam Fuller - NAS Program (pfuller@usgs.gov)
Page Last Modified: Thursday, January 11, 2018


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2018]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/24/2018].

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