The Nonindigenous Occurrences section of the NAS species profiles has a new structure. Nope, not yet! Cutthroat Trout may not make the same headlines as their bigger, rainbowed cousins, but they do get a much cooler name. Start typing to search for web content...Visit the reading room to search for documents. Once common throughout this range, cutthroat have Designed by Green Drake Services. The Vertebrates of Arizona. Any management plan should attempt to minimize the physical, chemical, biological, and hydrological disturbances that land management activities may have on cutthroat trout habitat or surrounding riverbank areas. This gives brook trout a competitive advantage because they are not as picky about where they live. Yellowstone Cutthroat Trout are used extensively for mountain lake stocking on the east slope of the Rocky Mountains and in the Absaroka-Beartooth Wilderness where they can grow to sizes up to 15 pounds. The species is also found in five lakes, including two small populations in Summit and Independence Lakes. Burr. Paiute Cutthroat Trout have the most restricted range of any of the generally recognized sub-species of cutthroat trout. This fish has been seriously reduced in its range by two primary factors: hybridization with Rainbow and/or Yellowstone Cutthroat Trout, and habitat loss and degradation. Fast-reproducing non-native trout, for example, can crowd native trout out of their original ranges. Tilmant, J.T. Names and dates are hyperlinked to their relevant specimen records. The coloration of this trout tends to be and olive-bronze to copper color on the back which transitions to a pale yellow with hints of red on the side. Land uses known to contribute to cutthroat habitat degradation include timber harvest, urbanization, road development, mining, and agricultural/livestock production. The cutthroat trout (Oncorhynchus clarkii) is a fish species of the family Salmonidae native to cold-water tributaries of the Pacific Ocean, Rocky Mountains, and Great Basin in North America. Among the many issues associated with introductions of nonnative aquatic species is the likelihood of hybridization with native species. In addition, the yellowfin cutthroat trout was historically found in Twin Lakes at the headwaters of the Arkansas drainage. The original range of the Yellowstone Cutthroat Trout (YCT) includes the Yellowstone River drainage upstream of the Tongue River, the Snake River drainage upstream of Shoshone Falls. But the most insidious threat to cutthroat trout in Montana is hybridization by rainbow trout. Numerous watersheds on the fringe of core Westslope Cutthroat Trout range held fish, but likely at lower densities as naturally warmer waters likely limited populations to low densities. However due to the loss of populations across t… 2001. As a member of the genus Oncorhynchus, it is one of the Pacific trout, a group that includes the widely distributed rainbow trout. Coastal cutthroat trout are a native fish that live in the rivers of the Pacific Northwest of North America. Michigan Department of Conservation, Institute of Fisheries Research, Ann Arbor, MI. Prior to that, fisheries managers simply assumed that any wild cutthroat population they found in the front range, where there was no record of stocking, was Greenback. State and federal wildlife agencies classify Yellowstone cutthroat trout as a sensitive species. MS Rpt. The Yellowstone subspecies was introduced into Michigan (Hubbs and Lagler 1947). With winter finally here, you might have thought we were done with new record fish for a while. The Rio Grande cutthroat was the first trout to be discovered in North America by Europeans and was first described in 1541 by Spaniards crossing the southwest in search of gold. Lahontan cutthroat trout currently occupy between 123 to 129 streams within the Lahontan basin and 32 to 34 streams are outside the basin, totaling approximately 482 miles of occupied habitat. 1. Although inhabiting clear, cold streams in their native range in western North America, … 2500: v + 39p. Much of their spawning habitat in tributaries of the upper Yellowstone River has been lost to irrigation withdrawals which dewater the … Located on site - within walking distance from all rooms. Yellowstone, Lahantan and perhaps other subspecies have been stocked in Arizona (Minckley 1973). The native range of the coastal cutthroat trout extends south from the southern coastline of the Kenai Peninsula in Alaska to the Eel River in Northern California. Adults migrate from the ocean to spawn in fresh water. Elevations range from 6,120 feet to 8,799 feet. You can zoom in to Level 14, roughly 1:35,000 scale. Leader file photo/Jeff DeMoss; This 12 1/2-inch Yellowstone cutthroat trout caught by Samuel Jenkins on July 8, 2020 out of Johnson Creek in Box Elder County set a new Utah catch-and-release record. The Cutthroat Restaurant & Bar. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables. The state of Colorado planted Yellowstone cutthroats exclusively until sometime after 1974 (Beckman 1974). 50 pp. However, recent genetics work (Peacock et al. Cutthroat trout are popular gamefish, especially among anglers who enjoy fly fishing. Overharvest Protection Needs Fish Sustainability (FSI) rankings for Westslope Cutthroat Trout, 2013 Please note that data reliability is not currently displayed in these figures. 5 Star Rated Restaurant with full bar, including a great selection of wine, liquor & 11 beers on draft! Habitat loss is a major cause of decline of all subspecies of cutthroat trout. Poor land management practices can result in increased soil erosion, stream channel instability, and decreased water quality and quantity in cutthroat habitats. Lowe. An oft-mentioned example in western North America involves cutthroat trout, a cold-water fish that was once much more abundant and widespread, and rainbow trout, a popular sportfish also indigenous to parts of the West but widely introduced elsewhere. Greenback, Colorado River, and Rio Grande cutthroat are native to the state (Walker 1993). Escaped from a fish hatchery in Virginia. Tweet this page on Twitter or Fish. The historical range of the Yellowstone Cutthroat Trout was upstream of Shoshone Falls on the Snake River and tributaries. The biotic communities of southern Nevada. Nevada State Museum Anthropological Papers No. California Department of Fish and Game. Cutthroat Trout Range [ds773] SDE Feature Class Open this dataset in BIOS Download this dataset Tags anadromous, biota, environment, fish species, cutthroat, biota, California, ranges, trout, environment, Pacific, fish districts Summary To display and analyze presently known ranges for … Fukano, K.G., H. Gowing, M.J. Hansen, and L.N. Lahontan cutthroat trout. Range: Cutthroat trout are native to the Western United States; introduced in the Southeast. Spawning males, especially, typically wear golden brown colors. Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) are the most widespread native trout in the park and were the dominant fish species here prior to Euroamerican settlement.They are an important species in Yellowstone National Park, upon which many other species depend. This includes sizeable swaths of southern Montana, northwestern Wyoming, southeaster Idaho, and extends just a bit into northern Utah and Nevada, as well. by Big Popi | posted in: Cutts | 37. Standing on the bank looking down into the small river, I saw so many trout piled up below me it was looking into the raceway of a fish hatchery. 1967. Pacific Coast drainages from Prince William Sound, Alaska, to Eel River, northern California. 201-273. The group, with the use of a hired mule train, spent more than four days transporting the fish live in vinegar kegs over several mountain summits. These bucktails feature a few custom colors such as midnight galaxy and cosmic candy. Cutthroat trout feed within or just downstream of riffles where aquatic invertebrates are abundant. (1991) recounted a story of an early trout introduction told to Carl Hubbs by a Nevada pioneer George Schmidtlein. Since then, Snake River cutthroats have also been stocked in the state (Walker 1993). All cutthroats can be differentiated from rainbow trout by red, pink, or orange marking beneath the jaw that give the species its name. Westslope Cutthroat Trout (WCT) is a unique and important component of Canada’s freshwater fish fauna and often the only native trout throughout much of its range. You can conduct your own search on the Federal Register website. Many of the remaining genetically pure Yellowstone cutthroat trout are found within the park. 1967. Coastal cutthroat trout are resident in tributary streams and rivers of the Pacific basin and are rarely found more than 100 miles (160 km) from the ocean. However, some pure populations do still exist (Behnke, personal communication). Originally their range was as far downstream as the Tongue River, but today pure, unhybridized populations are limited to some headwaters streams and Yellowstone National Park. It also existed across the Continental Divide in Yellowstone Lake and in the Yellowstone River, and its tributaries downstream to the Tongue. •Hybrid zones are often dominated by individuals that represent the parental species. follow @USFWSsoutheast. Alaska, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. Cutthroat Trout. Houghton Mifflin Company, Boston, MA. Nonindigenous Aquatic Species Database. Four of these evolved in Colorado: the Colorado River cutthroat trout in drainages west of the continental divide, Greenback cutthroat trout in the South Platte and Arkansas River drainages, and the Rio Grande cutthroat trout in streams that drain into the San Luis Valley. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. † Populations may not be currently present. state centroids or Canadian provinces). We highly recommend reviewing metadata files prior to interpreting these data. This pattern may be driven by a longer period of co-occurrence or the fecundity subsidy associated with the presence of anadromous steelhead. Reach out to a regional spokesperson. Seven Nights in the Wind River Range: Visiting the Popo Agie Wilderness of the Shoshone National Forest, and Catching Cutthroat Trout and Brook Trout by the Score Matthew Dickerson July 18-25. Located on site - within walking distance from all rooms. 13, Part 4. Volume 42. We arrived at 7 a.m., quickly assembled our rods, did a little filming, then hit the stream. Full operation requires a pointing device: overlays marked (TT) show additional info in tool tip, (CL) when you click on the feature. This includes sizeable swaths of southern Montana, northwestern Wyoming, southeaster Idaho, and extends just a bit into northern Utah and Nevada, as well. 1982), and Yellowstone (Sigler and Sigler 1996) cutthroat were introduced to nonnative areas in Utah. The Westslope Cutthroat Trout's historical range was all of Montana west of the Continental Divide as well as the upper Missouri River drainage. 1991. * HUCs are not listed for states where the observation(s) cannot be approximated to a HUC (e.g. Insider Viewpoint. Scott and Crossman (1973); Moyle (1976a); Morrow (1980); Sublette et al. Accessed [1/25/2021]. Lahontan cutthroat trout (LCT) are close relatives of the Paiute cutthroat trout, and are divided into three distinct population segments based on geographic distribution, ecology, behavior and genetics (USFWS 2010). It also existed across the Continental Divide in Yellowstone Lake and in the Yellowstone River, and its tributaries downstream to the Tongue River. Gainesville, Florida. Recovery and Interstate Commerce Freshwater populations range through Rocky Mountains to Hudson Bay, Mississippi River, Great (including Lahontan, Bonneville, and Alvord basins), and Pacific basins from southern Alberta to Rio Grande drainage, New Mexico (Page and Burr 1991). There were so many brown trout that cutthroat trout were rarely seen. Coastal cutthroat trout inhabit a large range along the Pacific coast, extending from the Eel River in California north to coastal rainforests in Alaska. Aquat. The native range of rainbow trout borders the northern Pacific ocean from America to Russia but they have been introduced to many countries, including the UK. Allison. The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. Due to stocking of Cut Bows, and the stocking of Rainbow Trout in Cutthroat waters (and vice-versa) the non-native range has spread substantially. Crossman. Established for a time in Michigan, then died out (Hubbs and Lagler 1947, 1964; Becker 1983). Median location of CRCT was significantly further upstream in summer than in spring, whereas range and movement of CRCT were greater in spring than in summer. and B.M. Checklists of the fish fauna of the Laurentian Great Lakes and their connecting channels. Click on the Layers icon and select the cutthroat variants to view. The common name "cutthroat" refers to the distinctive red coloration on the underside of the lower jaw. What's more exciting, is that they will be on their way, West of the Mississippi, to target some monster Lahontan Cutthroat Trout! Introduced as a sport fish outside its native range. Coastal cutthroat trout are resident in tributary streams and rivers of the Pacific basin and are rarely found more than 100 miles (160 km) from the ocean. Part 2. Range and Habitat. Ultimate USA Cutthroat Map. Northfork of the Shoshone River and is located . National Park Service. Citation information: U.S. Geological Survey. Yellowstone cutthroat can be distinguished from other subspecies by their larger black spots that are clustered towards the tail, and by their gray, gold, or copper hues. A Field Guide to Freshwater Fishes - North America North of Mexico. This information is preliminary or provisional and is subject to revision. All documented US populations . Select from premium Cutthroat Trout of the highest quality. The native range of the coastal cutthroat trout extends south from the southern coastline of the Kenai Peninsula in Alaska to the Eel River in Northern California. primary habitats, Visit the reading room to search for documents. They prefer estuaries, lagoons, and small, low-gradient coastal streams. It is being provided to meet the need for timely best science. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. ~ C heck our Facebook page for nightly specials ~ They are also… Tucson. The mission of the Coastal Cutthroat Trout Interagency Committee, administered by the Pacific States Marine Fisheries Commission, is to “develop a consistent framework to help guide and prioritize conservation, management, research, and restoration of coastal cutthroat trout throughout their native range”. monids, including cutthroat trout. Rio Grande cutthroat have the distinction of being the southern most subspecies of cutthroat trout. For example, brook trout can thrive across a range of water temperatures whereas westslope cutthroat trout have specific preferences. 1990) cutthroat subspecies have all been introduced in nonnative areas of Nevada. Lahontan cutthroat trout is a threatened subspecies of cutthroat trout endemic to the Great Basin of southeast Oregon, northern Nevada, and northeastern California (Coffin and Cowan 1995). [2021]. Mature fish have elongated bodies, normally having a length several times the width of their bodies. The Cutthroat trout (Oncorhynchus clarkii) is native to the cold-water tributaries of the Pacific Ocean, from California to Alaska, the Rocky Mountains, and Great Basin in North America. 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. Sci. Paiute (Moyle 1976a), Yellowstone (Dill and Cordone 1997), and probably coastal and Lahontan cutthroat have been transplanted outside their native ranges in California. between downtown Cody, Wyoming and the East Entrance to Yellowstone National Park. Coloration of the cutthroat trout is variable, but cutthroat trout are distinguished from other trout species by the two prominent red slashes on the lower jaw. Full operation requires a pointing device: overlays marked (TT) show additional info in … Yellowstone Cutthroat Trout are a Montana Fish of Special Concern. Ultimate USA Cutthroat Map. Lahontan, Bear Lake (Idaho Fish and Game 1997), and perhaps westslope cutthroats (Simpson and Wallace 1978) have been introduced into nonnative areas of Idaho. Rainbow trout ( Oncorhynchus mykiss ) are not native to the UK – our only native trout is the brown trout ( Salmo trutta ). Miller, R.R. Looking for a media contact? Freshwater habitats range from the smallest headwater stream (often less 3 feet wide) to large deep lakes. In Maryland scaped juveniles were found in a creek downstream from a fish hatchery (D. Neely, personal communication; Frostburg State University museum). States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Cutthroat trout are freshwater fish in the family Salmonidae, as are rainbow trout. Cutthroat Trout Conservation. Yellowfin cutthroat, formerly native to Twin Lakes, Colorado, is now extinct (Walker 1993). Can. Between 1895-1940, 105,000 fish were stocked in Newaygo County, Michigan (Fukano et al. The introduction of nonnative trout species—resulting in increased competition an… Westslope (Sigler and Miller 1963), greenback (Tyus et al. The Cutthroat Restaurant & Bar. Due to a long period isolation between the different populations of Humboldt cutthroat there is a high degree of variation in their features across their native range. In 1999, Paul Thompson, a biologist with the Utah Division of Wildlife Resources (DWR), visited 40 locations (32 different tributary sites and eight on the main Logan River) and found cutthroat trout at 22 of the locations. As such the description provided here is generalization for the subspecies across its native range. Because of its specific habitat requirements, WCT is viewed as an indicator species of general ecosystem health. Westslope (Eddy and Underhill 1974) and Lahontan cutthroat (La Rivers 1962) were introduced into Minnesota. Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted. Fishes of Arizona, p 133-151, In: C.H. Table 1. Cutthroat trout naturally interbreed with the closely related rainbow trout, producing fertile hybrids commonly called "cutbows" although this is a much rarer occurrence with the coastal cutthroat trout because of reproductive isolation as the coastal cutthroat trout is the only cutthroat subspecies to coevolve through its entire range with the coastal rainbow trout (O. mykiss irideus). Stocked numerous times since the late 1800s in Connecticut (Whitworth 1996). Range. Further, threats were only ran… Yellowstone Cutthroat can be distinguished from other cutthroat trout by their larger black spots, … Indiscriminate stocking has obscured recognition of many subspecies (Page and Burr 1991; Behnke 1992). In 1873, George gathered together family and neighbors, including a native American, to transfer Cutthroat Trout O. clarki henshawi from the Reese River system to his pond in Big Smoky Valley. In general, Yellowstone Cutthroat Trout are larger than Westslope Cutthroat Trout and more prone to eat fish as part of their diet. Yellowstone Cutthroat. It now only occupies just 12 percent of its historic habitat in approximately 800 miles of streams. Habitat Protection Needs Fish Sustainability (FSI) Rankings for Westslope Cutthroat Trout, 2013 2. Yellowstone cutthroat trout. Bradley, W. G. and J. E. Deacon. They inhabit clear, cold streams with naturally fluctuating flows, low levels of fine sediment, well-vegetated streambanks, and diverse, abundant instream cover. Fine-spotted Snake River cutthroat from Wyoming were stocked in Arkansas in 1984 (Robison and Buchanan 1988). It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. This fish has been seriously reduced in its range by two primary factors: hybridization with Rainbow and/or Yellowstone … The following Federal Register documents were automatically gathered by searching the Federal Register Official API with this species’ scientific name ordered by relevance. Miller et al. Lowe, ed. Lahontan cutthroat trout inhabit a wide range of habitats from cold, high-elevation mountain streams in California to lower-elevation and highly alkaline desert lakes in Nevada. They are a subspecies of trout and are unique in that some populations have a sea-going (or “anadromous”) component. Inland fisheries management. Rio Grande cutthroat trout, Oncorhynchus clarkii virginalis, can be found in high elevation streams and lakes of the Rio Grande, Canadian, and Pecos River drainages in Colorado and New Mexico, giving it the southern-most distribution of any form of Cutthroat Trout. NPS/Todd Koel Historically the most abundant and widely distributed subspecies of cutthroat trout, the westslope cutthroat trout ( Onchorhynchus clarkii lewisi, WCT) occupies less than 5% of its former range in the upper Missouri River drainage. Cool, clean water with ample cover and deep holding pools is a good spot to find them, especially in warmer summer months. The specific n… The historic range is in the Sliver King Creek drainage, Alpine County, CA, and provides … Read More. For example, the Rio Grande cutthroat trout, the highly-threatened state fish of New Mexico and the southern-most subspecies of cutthroat trout, is now confined to only a few Rocky Mountain streams in Colorado and New Mexico after experiencing an 88% decrease in range size over the last 150 years. Both species have been stocked in the same drainages (Walker 1993). Permits, Waterfowl Coastal Cutthroat Range Maps. Established in Arizona, California, Colorado, Nevada, and Utah. Westslope cutthroat trout are native in northern Idaho's and British Columbia's upper Columbia River system and northern tributaries of the Snake River, but not the Snake River's main stem to the south. The magnitude of the cutthroat’s loss has never been truly quantified, but best estimates show its range — which once spanned Colorado, New Mexico, Utah and Wyoming — has been cut by about 85%. Johnson Creek is at the center of a state effort to restore the Yellowstone cutthroat trout within its native range in Utah. Neely, D. - University of Alabama, Tuscaloosa, AL. Management of nonindigenous aquatic fish in the U.S. National Park System. Share this page on Facebook or Sacramento, CA. This beautiful trout is considered a minor subspecies of the Yellowstone cutthroat and is native to the Rio Grande, Canadian and Pecos River drainages of New Mexico and Colorado. The rugged topography of their range has lead to isolation, which in … Brook trout can outcompete westslope cutthroat trout because they have broader habitat tolerances and hatch earlier in the season. Protecting and enhancing aquatic habitat are the most effective ways to maintain or restore cutthroat trout populations. They once occupied a vast range east of the Sierra Nevada but have been extirpated from nearly 95 percent of their native habitat in California. Behnke (1992) recognized 14 subspecies and provided information on each one. Cutthroat trout were first observed in 1955 in Tennessee and in 1982 in Arkansas. Competition with non-native trout, coupled with habitat loss, now limits the imperiled native trout to less than 10 percent of its original range. Unknown subspecies were stocked in Connecticut, Nebraska, New Jersey, Tennessee, and Wisconsin. Find the perfect Cutthroat Trout stock photos and editorial news pictures from Getty Images. Cutthroat trout are freshwater fish in the family Salmonidae, as are rainbow trout. Avid angler Jordan Rodriguez of Meridian decided to grab his ice auger and hit the road in search of Bonneville, and Lahontan (La Rivers 1962), Yellowstone, greenback (Deacon and Williams 1984), Rio Grande, fine-spotted Snake River, and Yellowstone (Sublette et al. Insider Viewpoint Magazine. Most stocking attempts in other states failed (e.g., Tennessee, Connecticut, Minnesota) or populations replenished with repeated stockings. Generally, the back and sides of cutthroat trout are lightly spotted; dorsal, adipose, and tail fins can be heavily spotted. As such, it plays an important role in structuring many north temperate aquatic ecosystems. 2000. McAffee, W.R. 1966. Invertebrates eaten include the larval and pupal stages of mayflies, stoneflies, and caddisflies. Species History: The historical range of the Yellowstone Cutthroat Trout was upstream of Shoshone Falls (southwestern Idaho) on the Snake River and tributaries. For queries involving fish, please contact Matthew Neilson. The Rio Grande cutthroat trout once ranged over much of the upper Rio Grande basin in New Mexico and southern Colorado, according to Craig Springer, fisheries biologist for USFWS in Santa Fe. and C.H. Like most trout species, cutthroat trout are opportunistic feeders and primarily consume invertebrates, small fish, and zooplankton. Yellowstone Cutthroat Guest Ranch sits on the . Status: Not listed under the Endangered Species Act, but several subspecies are considered threatened in their native ranges. We're sorry but an error occurred. University of Arizona Press. 1964. Paiute Cutthroat Trout have hybridized with introduced rainbow trout and Lahontan Cutthroat Trout, resulting in a loss of distinctiveness of this subspecies in many areas (U.S. native ranges of westslope cutthroat trout and rainbow trout overlap (e.g., Clearwater and Salmon river basins). (1990); Page and Burr (1991); Behnke (1992). The original range of the Yellowstone Cutthroat Trout (YCT) includes the Yellowstone River drainage upstream of the Tongue River, the Snake River drainage upstream of Shoshone Falls. Fishing Records – Nevada. This species was formerly known as. Visit the Federal Register to conduct your own search. Yellowstone cutthroat, Interior (noncoastal) cutthroat (all subspecies except. Humboldt cutthroat have a dull almost dirty looking red or pink stripe along their lateral line and on their … Native to western North America, cutthroat trout have been introduced as a sport fish in the Southeast. Range Cutthroat trout historically have inhabited the riv-ers and lakes of much of the Western United States. The Natural Area was established in 1973 to ensure the preservation of the Lahontan Cutthroat Trout, a threatened species of fish, in its natural habitat and to maximize available spawning areas. Although inhabiting clear, cold streams in their native range in western North America, this species is becoming a popular sport fish stocked below federal water projects in the Southeast. Page, L.M. The coastal cutthroat trout ranges from northern California to Southcentral Alaska and makes use of a great variety of habitats within that range. 13 Apr 2011 . Genetically pure Yellowstone cutthroat trout (YCT) populations have declined throughout their natural range in the Intermountain West, succumbing to competition with and predation by nonnative fish species, a loss of genetic integrity through hybridization, habitat degradation, predation, and angling harvest. Saltwater habitats range from brackish estuaries to fully marine shoreline environments. Lahontan cutthroats are now established outside their native range in eleven … The Lahontan (La Rivers 1962) and Colorado River (Gorges 1994) cutthroat were introduced in Wyoming. follow USFWSsoutheast. Yellowstone cutthroat were introduced in Oregon (Bond 1973) and Washington (Schultz and DeLacy 1935). 3 pp. In 2019, cutthroat trout were stocked for the first time in Kentucky in the Cumberland tailwaters below the Wolf Creek Dam. However… All documented US populations . These fish, or their progeny, eventually spread to many of the area streams. cutthroat trout subspecies, reflecting their long history of isolation from other salmonids. Many introductions resulted from authorized stocking for sportfishing. Westslope cutthroat trout are one of 11 native species in Yellowstone National Park. The Colorado River Cutthroat historically occupied most cool water habitats of the Colorado River watersheds in Colorado, southern Wyoming, eastern Utah, extreme northwestern New Mexico and northeastern Arizona. The most diverse trout species in North America, the historical distribution of cutthroat trout covers the broadest range of any stream dwelling trout in the Western Hemisphere. Lahontan cutthroat were recently introduced into Washington (Washington Department of Fish and Wildlife 1997).