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| NAS - Nonindigenous Aquatic Species |
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Common Name: cutbow trout
Taxonomy: available through 
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.
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).
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).
Insider Viewpoint. 2001. Fishing Records –
Rasmussen, J.L. 1998. Aquatic nuisance species of the
Other Resources:
FishBase Fact Sheet
Author: Pam Fuller
Revision Date: 8/10/2004 Citation for this information:
Pam Fuller. 2009. Oncorhynchus clarkii x mykiss. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?SpeciesID=904> Revision Date: 8/10/2004
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