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.
Interactive maps: Point Distribution Maps
Puerto Rico &
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.
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.
Fact Sheet for Oncorhynchus clarkii
- USGS Nonindigenous Aquatic Species Database
Fact Sheet for Oncorhynchus mykiss - USGS Nonindigenous Aquatic Species Database
Revision Date: 5/20/2013
Peer Review Date: 4/1/2016
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.