In determining which areas to designate as critical habitat for a species, the FWS considers physical and biological attributes that are essential to the Colorado pikeminnow. Eggs hatch within the river substrate as spring peak flows decline, with the larvae carried potentially long distances by Anglers enjoy the warm-and cold-water fishing opportunities, which include channel catfish, bluegill, largemouth bass, black bullhead, a sunfish/bluegill hybrid, carp, … Fish and Wildlife Service, Colorado River Fishery Project, Vernal, Utah A special FWS regulation will allow anglers to take pikeminnows in this stretch of the river, as long as they comply with all other state regulations. Pikeminnows migrate either upstream or downstream for spawning in late spring, and eggs hatch in less than four days at water temperatures of about 70°F (21°C). Recent. Transactions of the American Fisheries Society 98 (2): 193-208. Description Young prefer small, quiet backwaters. https://www.encyclopedia.com/environment/science-magazines/colorado-pikeminnow, "Colorado Pikeminnow higher salinity, and the presence of introduced fishes, such as the red shiner, redside shiner, and green sunfish. "Colorado Squawfish Recovery Plan." water development and introductions of non-native fish, cladocerans, copepods, chironomid midge larvae, aquatic insect larvae, other fishes, Colorado pikeminnow spotlight species action plan, Colorado Pikeminnow (Ptychocheilus lucius) Recovery Plan (Amendment and Supplement for Recovery Goals), Endangered and Experimental Population, Non-Essential. This species has adapted to a watershed known for its variable flow, high silt loads, and turbulence. This fish is also called the Colorado squawfish. These fish can grow to about 15 pounds, and live as long as 40 years. Lowlands inundated during spring high flow appear to be important habitats. Fig. See also what's at Wikipedia, your library, or elsewhere.. Colorado pikeminnow. Most online reference entries and articles do not have page numbers. Colorado pikeminnow, were initiated by the Service’s Washington, D.C., office in 1979, 1985, and 1991 (44 FR 29566, May 21, 1979; 50 FR 29901, July 22, 1985; 56 FR 56882, November 6, 1991). The Colorado pikeminnow is the largest minnow in North America and is an endangered, native fish of the Colorado River thought to have evolved more than 3 million years ago. The Colorado pikeminnow (Ptychocheilus lucius) is a federally endangered fish, which was once abundant and widespread in the Colorado River basin. Final Critical Habitat for the Colorado pikeminnow (Ptychocheilus lucius) Metadata Updated: November 1, 2017 To provide the user with a general idea of areas where final critical habitat for Colorado pikeminnow (Ptychocheilus lucius) occur based on the description provided in the Federal Register. It is hypothesized that within‐day flow fluctuations caused by hydropower operations can directly affect the suitability of such habitats by altering water temperature and habitat geometry. . Young prefer small, quiet backwaters. The proliferation of dams has drastically restricted their range. Colorado pikeminnow are predominate in shoreline habitats and were associated with sandy substrate, however, they also used eddy, run, backwater, and pool habitats and silt boulder, rubble, and gravel substrates (Tyus and McAda 1984). Habitat and Range: The Colorado River Pikeminnow is endemic to the Colorado River basin from Wyoming to Mexico and once occupied both the Colorado and Gila river drainages in Arizona. Programs aimed at reducing salt and selenium in the waterway are showing signs of success. Upstream or downstream migration to spawn in late spring. Identification of Backwater Nursery Habitats of Colorado Pikeminnow in the Middle Green River, Utah, Using High-Resolution Remotely Sensed Imagery The Colorado pikeminnow (Ptychocheilus lucius, formerly squawfish) is the largest cyprinid fish of North America and one of the largest in the world, with reports of individuals up to 6 ft (1.8 m) long and weighing over 100 pounds (45 kg). It is long and slender, with a pointed snout and flattened head. The first Colorado pikeminnow reported from Wyoming in nearly 30 years was captured, identified, and released unharmed in August 1990 by a zoology professor from Arizona State University. The Colorado pikeminnow, Ptychocheilus lucius, is the largest of the large Cyprinidae (minnow) family, sometimes attaining a length of 5 ft (1.5 m) and a weight of 80 lb (36 kg). On the Navajo Nation Notice of availability of draft recovery goals for four endangered fishes of the Colorado River Basin. This portion of the 58-mile mainstem of the Gunnison River just south of Whitewater has been designated as critical habitat for the Colorado pikeminnow and razorback sucker, which are two species of endangered fish. 20021231 publication date Complete As needed-110.719413982-107.553014975 40.5597350553 36.7198740601 ISO 19115 Topic Categories biota environment None U.S. FIGURE 1. "Life History of the Colorado Squawfish and the Colorado Chub in the Green River in Dinosaur National Monument." The Colorado Pikeminnow (Ptychocheilus lucius) is a species of concern belonging in the species group "fishes" and found in the following area(s): Arizona, California, Colorado, Mexico, Nevada, New Mexico, Utah, Wyoming. Moreover, reservoirs flood what was suitable river habitat, and their dams alter river flows and water temperature downstream. 1). Arizona, California, Colorado, Utah, Wyoming. HABITAT: The Colorad o pikeminnow inhabits medium to large rivers. Live Statistics. Description. And this month, two of the ski areas they sit between on the I-70 corridor — Keystone Resort to the east and Sunlight Mountain to the west — have both received approvals to expand as well. The first Colorado pikeminnow reported from Wyoming in nearly 30 years was captured, identified, and released unharmed in August 1990 by a zoology professor from Arizona State University. Colorado pikeminnow and razorback sucker exist only in the Colorado River basin, said Travis Schmidt, a research ecologist for the Wyoming-Montana Water Science Center. Colorado squawfish winter habitat study, Yampa River, Colorado, 1986-1988. Pick a style below, and copy the text for your bibliography. Since the construction of Hoover Dam in the 1930s and subsequent massive water control projects on the Colorado, water flow has been greatly reduced, radically altering the riverine environment. Beacham's Guide to the Endangered Species of North America. Read More. Our goal through this campaign is to help spread awareness of the Colorado pikeminnow and educate community members on how the reintroduction of this native predator to the Colorado River in Grand Canyon can help to stabilize the ecosystem within the river without harming current populations of native fish. With the help of over 7,000 of the world’s best wildlife filmmakers and photographers, conservationists and scientists, Arkive.org featured multi-media fact-files for more than 16,000 endangered species. It was probably extirpated from the Gila River basin in Arizona by 1990, but rein-troduction of the species is ongoing. tributaries. Colorado Pikeminnow (Ptychocheilus lucius) Species Status Statement. . Diet: Colorado pikeminnow are primarily piscivorous (fish-eaters), but smaller individuals also eat insects and other invertebrates. Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Like the pikeminnow, the razorback sucker is a large, long-lived fish that used to live throughout the large rivers and tributaries of the Colorado River drainage, but is now extremely rare upstream of the Grand Canyon. The species was once found throughout the Colorado Basin, so occurred in Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming, as well as in Mexico. In March 1994, the FWS published the final rule designating critical habitat for the Colorado pikeminnow in portions of the upper basin of the Colorado, Green, Yampa, White, and San Juan Rivers; there is no critical habitat designated in the lower basin. The Colorado pikeminnow’s status also was considered in the 1978, 1991, … The Spanish explorer Francisco de Ulloa unwittingly reached the mouth of the Colorado River, in the Gulf of California,…, Colorado Springs: History by Colorado pikeminnow (historic habitat) before dam completion. Identification of Backwater Nursery Habitats of Colorado Pikeminnow in the Middle Green River, Utah, Using High-Resolution Remotely Sensed Imagery Facts Summary: The Colorado Pikeminnow (Ptychocheilus lucius) is a species of concern belonging in the species group "fishes" and found in the following area(s): Arizona, California, Colorado, Mexico, Nevada, New Mexico, Utah, Wyoming.This species is also known by the following name(s): Colorado River Squawfish, Colorado Pikemeadow. Brown, with a faint t…, Colorado Northwestern Community College: Tabular Data, Colorado Northwestern Community College: Narrative Description, Colorado Mountain College, Timberline Campus: Tabular Data, Colorado Mountain College, Timberline Campus: Narrative Description, Colorado Mountain College, Spring Valley Campus: Tabular Data, Colorado Mountain College, Spring Valley Campus: Narrative Description, Colorado Mountain College, Alpine Campus: Tabular Data, Colorado Mountain College, Alpine Campus: Narrative Description, Colorado Mountain College District System: Distance Learning Programs, Colorado Mountain College District System, Colorado Christian University: Tabular Data, Colorado Christian University: Narrative Description, Colorado Christian University: Distance Learning Programs, Colorado Christian University Alumni Association, Colorado School of Healing Arts: Narrative Description, Colorado School of Healing Arts: Tabular Data, Colorado School of Mines: Narrative Description, Colorado School of Trades: Narrative Description, Colorado State University (College of Business), Colorado State University (College of Business, Distance M.B.A. Remaining Colorado pikeminnow occur for the most part in the Green River in Utah, and in the Yampa and Colorado Rivers in Colorado and portions of Utah. Improved in 24 Hours. Many early settlers preferred the "white, flaky, and sweet" flesh of the pikeminnow over any of the native trout. English Articles. A long-lived fish, spawning occurs in females at about 15 years of age during the months of July and August. The life in and around the Colorado River works together. Colorado Pikeminnow Reintroduction Campaign About Our goal through this campaign is to help spread awareness of the Colorado pikeminnow and educate community members on how the reintroduction of this native predator to the Colorado River in Grand Canyon can help to stabilize the ecosystem within the river without harming current populations of native fish. Program), Colorado State University-Pueblo: Distance Learning Programs, Colorado State University-Pueblo: Narrative Description, Colorado State University-Pueblo: Tabular Data, Colorado State University: Distance Learning Programs, Colorado State University: Distance Learning Programs In-Depth, Colorado State University: Narrative Description, Colorado Technical University Denver Campus: Narrative Description, https://www.encyclopedia.com/environment/science-magazines/colorado-pikeminnow. The fish is thought to be absent from the lower Colorado River and rare throughout the remainder of the range. However, the date of retrieval is often important. The Colorado pikeminnow is one of four minnow species, all living in western North America. Colorado pikeminnow was once widespread throughout the Colorado River Basin (Holden & Wick, 1982; Miller, 1961), but during the last century suffered dramatic declines because of habitat fragmentation and environmental alteration (US Fish and Wildlife Service, USFWS, 1967). Encyclopedia.com. The Colorado Pikeminnow is the main reason fish ladders were created in Colorado. Home-range fidelity and use of historic habitat by adult Colorado pikeminnow (Ptychocheilus lucius) in the White River, Colorado and Utah David B. Irving U.S. Aquatic invertebrates, insect larvae, fish. Adult pikeminnows use various habitats which include deep, turgid, strongly flowing waters, eddies, runs, flooded bottoms or backwaters (especially during high flows). HABITAT Biologists seeking Colorado pikeminnow begin to find them at the Adults attain a maximum size of about 1.8 m total length (TL) and 36 kg in weight. 54,923), seat of Yuma co., extreme SW Ariz., on the eastern bank of the Colorado River near the confluence of the Gil…, cliff dwellers, Ancestral Pueblo people, sometimes called Anasazi, who were builders of the ancient cliff dwellings found in the canyons and on the m…, Until 1963, Glen Canyon was one of the most beautiful stretches of natural scenery in the American West. 66 FR 47033, September 10, 2001. Box 25486Denver Federal CenterDenver, Colorado 80225http://www.r6.fws.gov/. Distribution Colorado pikeminnow is a large-bodied, migratory fish that was historically widespread throughout the major streams of the Colorado River basin (Tyus 1991). In Colorado, they are currently found in the Green, Yampa, White, Colorado, Gunnison, San Juan, and Dolores rivers. This article is only an excerpt. The history of Colorado Springs is the history of two very different communities, one wild and rowdy, the other a model of…, Yuma (yōō´ mə), city (1990 pop. U.S.FWS Species profile about species listing status, federal register publications, recovery, critical habitat, conservation planning, petitions, and life history U.S. Final Critical Habitat for the Colorado pikeminnow (Ptychocheilus lucius) ... Use Constraints: The GIS files and their associated coordinates are not the legal source for determining the critical habitat boundaries of species described within this dataset. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites: http://www.chicagomanualofstyle.org/tools_citationguide.html. Eggs hatch in 3.5-6 days at 20-22 C. Survival and hatching best at 20 C. Larvae enter stream drift and are transported downstream for about 6 days, traveling an average distance of 160 km to reach low gradient nursery areas. The Colorado River was once one of the world's most turbulent rivers. In the Gila River basin, their distribution extended as far north as Perkinsville on the Verde River, eastward to Ft. Thomas on the Gila River, and as far south as the delta in Mexico. 1 Distribution and critical habitat of the Colorado pikeminnow in the Colorado River system (USFWS 2014a , b ) The Colorado River Basin with Colorado subbasin inside the red oval. We also translocated 2 fish recaptured in September 1993, 1 from the H:\Home\700Lib\FishUCRIP\Fish Screens\Final Biological Assessment 1 INTRODUCTION Redlands Water and Power Company The Redlands Water and Power Company (RWPC) was established to supply irrigation water from the Gunnison River to the Redlands community near Grand Junction, Colorado. Distribution Colorado pikeminnow is a large-bodied, migratory fish that was historically widespread throughout the major streams of the Colorado River basin (Tyus 1991). The adult pikeminnow was found in the Little Snake River a few miles north of the Colorado-Wyoming border. U. S. Fish and Wildlife ServiceRegional Office, Division of Endangered SpeciesEastside Federal Complex911 N. E. 11th Ave.Portland, Oregon 97232-4181Telephone: (503) 231-6121http://pacific.fws.gov/, U. S. Fish and Wildlife ServiceRegional Office, Division of Endangered SpeciesP.O. During exotic fish removal sampling in the spring of 2003, 2004, and 2005, 2 Colorado pikeminnow were collected upstream of critical habitat in the Yampa River, Colorado. Adults are dark olive above, whiter below. Newly hatched larvae drift downstream immediately after hatching, and there is apparently a long-term upstream movement of juveniles that repopulates and maintains the upstream populations of adults. Ponds and backwaters with emergent vegetation provide habitat for many amphibians, such as leopard frog, lizards and snakes. Share. Colorado Pikeminnow (Ptychocheilus lucius) Species Status Statement. Colorado pikeminnow can live up to 40 years and were historically known to grow to nearly 6 feet long and weight 80 pounds. The Colorado pikeminnow (Ptychocheilus lucius) is a federally endangered fish, which was once abundant and widespread in the Colorado River basin. Status review of the razorback sucker Xyrauchen texanus with management recommendations for the Upper Colorado River Basin. Newly hatched young feed on zooplankton and insect larvae. Adults spend most of their time in eddies, pools, and protected pockets just outside of the main current. Colorado Parks and Wildlife is a nationally recognized leader in conservation, outdoor recreation and wildlife management. COLORADO PIKEMINNOW (PTYCHOCHEILUS LUCIUS) Navajo/Federal Statuses: NESL G2 / listed endangered on 11 MAR, 1967 (32FR:4001) with designated Critical Habitat 21 MAR 1994 (59FR:13374). (October 18, 2020). They have been transplanted to the Salt and Verde Rivers, both within their native range. Makes extensive spawning migrations; spawning migration of up to 205 km (one-way) has been documented; in late spring, different individuals migrate upstream from Green River and downstream in Yampa River to common spawning area. The snail darter, Percina tanasi, is a small, robust fish, rarely exceeding 3.4 in (9 cm) in length. Restricted to large rivers of the Colorado River basin, formerly in the mainstream Colorado River and major tributaries (Gunnison, White, Yampa, Dolores, San Juan, Uncompahgre, Animas, and Green rivers), from Mexico and Arizona to Wyoming. OSTI.GOV Technical Report: Exploring the Application of Optical Remote Sensing as a Method to Estimate the Depth of Backwater Nursery Habitats of the Colorado Pikeminnow The agency manages 42 state parks, all of Colorado's wildlife, more than 300 state wildlife areas and a host of recreational programs. Utah Academy Proceedings 50 (1): 25-32. The FWS hopes to establish a sport fishery for the pike-minnow in the lower Colorado River. ." The agency manages 42 state parks, all of Colorado's wildlife, more than 300 state wildlife areas and a host of recreational programs. It is long and slender, with a pointed snout and flattened head. 18 Oct. 2020 . During exotic fish removal sampling in the spring of 2003, 2004, and 2005, 2 Colorado pikeminnow were collected upstream of critical habitat in the Yampa River, Colorado. Added in 24 Hours. This species is also known by the following name(s): Colorado River Squawfish, Colorado Pikemeadow. "Changes in Native Fish Distribution in the Green River System, Utah-Colorado." Habitat considered critical to the survival and recovery of Colorado pikeminnow was later designated in portions of Colorado, Utah, New Mexico, Arizona, and California (USFWS 1994) (Fig. Adults are dark olive above, whiter below. Colorado pikeminnow Web site of Fish and Aquatic Conservation, a program within the Fish & Wildlife Service. Adults predominate in the White and Yampa rivers, young in the Green River. The pikeminnow was once found in the Colorado River basin throughout the mainstream and major tributaries from Arizona to Wyoming. Fish and Wildlife Service.] Data is a compilation of many Colorado, Utah, and Federal sources to respresent all ESA species in the Uinta Basin area. Spawns under decreasing flow regimen with increasing temperatures in summer. They can also utilize inundated lowlands. Predatory fish such as northern pike, walleye, and smallmouth bass challenge the recovery of native species, some of which only exist in the river basins of western Colorado. Colorado pikeminnow are known for long-distance spawning migrations of more than 200 miles in late spring and early summer. Fish and Wildlife Service.] Programs aimed at reducing salt and selenium in the waterway are showing signs of success. Medium to large rivers. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates. By states, its range included: the Gila River basin in Arizona; the Colorado River from the Mexican border to the Nevada state line in California; the Colorado River and lower reaches of the Gunnison, White, Yampa, Dolores, San Juan, Uncompahgre, and Animas Rivers in Colorado; the San Juan and Animas Rivers in New Mexico; the Colorado River mainstream in Nevada; the entire reach of the Colorado and Green Rivers, and the San Juan, White, and Dolores Rivers in Utah; and the Green River in Wyoming. About. Distribution: Currently restricted to the Upper Colorado River from WY to NM. Today, researchers commonly see adult Colorado pikeminnow that are 2 to 3 feet in length. Vanicek, C. D., and R. H. Kramer. Get this from a library! LFL-044– Bestgen, K. R. 1990. Adults use various habitats, including deep turbid strongly flowing water, eddies, runs, flooded bottoms, or backwaters (especially during high flow). "Colorado Pikeminnow In Utah, wild, self-sustaining populations of Colorado pikeminnow currently exist in the Green River and upper Colorado River sub-basins. U. S. Fish and Wildlife Service, Denver. Despite the importance of backwaters to juvenile … A voracious predator, it has a large mouth with long, fragile gill arch wells that are designed for grasping prey. None of these fishes reach a size comparable to a Colorado pikeminnow. [Paul B Holden; Western Energy and Land Use Team. Lowlands inundated during spring high flow appear to be important habitats. Although this report was significant and prompted new sampling in the Wyoming section of the Upper Colorado River basin, biologists were only cautiously optimistic because adult pikeminnows have been known to migrate long distances during spawning periods; one theory was that the fish was a member of an unknown Wyoming population, but it also could have been far upstream from its normal range. Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Habitat: The Colorado pikeminnow thrives in swift flowing muddy rivers with quiet, warm backwaters. "Colorado Pikeminnow Larval Fish Laboratory, Colorado State University, Fort Collins. Encyclopedia.com. Habitat for the young fish is predominately alongshore backwaters and associated shorelines of more alluvial reaches of the turbulent and turbid rivers of the Colorado system. May live 30 years or more . Parent Layer: Wildlife Habitat Name: Colorado Pikeminnow Display Field: DATA_NAME Type: Feature Layer Geometry Type: esriGeometryPolygon Description: To display ESA wildlife species habitat. Wildscreen's Arkive project was launched in 2003 and grew to become the world's biggest encyclopaedia of life on Earth. HABITAT Class C / F streams Intermediate / Variable Pools, Slow Runs Pools, Slow Runs Offchannel Habitat Main Channel Spawning Migration Spawning Return Migration J 1,000’s of cubic Ft/sec Mean Monthly Flows at Yuma, AZ 1972-2000 1904-1934 0 20 40 60 80 F M A M J J A S O N D Generalized Life History of Juvenile / Mature Colorado Pikeminnow The pikeminnow is migratory, undertaking long-distance spawning migrations of 250 mi (400 km), round trip; homing behavior has also been noted by researchers. In the Colorado subbasin, this collaborative effort focuses on a 15-mile stretch of river identified as critical habitat for the Colorado pikeminnow (see Figure 1, Colorado subbasin is highlighted with the red line). ; Biological Services Program (U.S.); U.S. Also in 1987, the FWS proposed that a third experimental population be established in the main Colorado channel between Imperial Dam and Parker Dam. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list. Thankfully, Colorado understands how important one species is to the entire ecosystem. Fish thriving in its turbid and highly mineralized waters were specially adapted to these extreme conditions, and the pikeminnow was plentiful. Its nearest relatives live in the Columbia River, Sacramento River, and Oregon costal rivers. 1978. Beacham's Guide to the Endangered Species of North America. Colorado pikeminnow can be downlisted .....20 . In Eagle County, Vail and Ski Cooper both expanded into new terrain in the 2019-20 season, each opening new surface lifts in 2020. ; Biological Services Program (U.S.); U.S. Quite the same Wikipedia. The Colorado pikeminnow (Ptychocheilus lucius, formerly squawfish) ... and are transported downstream. This portion of the 58-mile mainstem of the Gunnison River just south of Whitewater has been designated as critical habitat for the Colorado pikeminnow and razorback sucker, which are two species of endangered fish. The canyon had been cut over thousands of ye…, Percina tanasi to the function and conservation role of critical habitat for the Colorado pikeminnow and razorback sucker to determine whether the current proposal destroys or adversely modifies critical habitat for these species. Broader term: Pikeminnows; Used for: Ptychocheilus lucius; Colorado squawfish; Filed under: Colorado pikeminnow Flow regimes for restoration and maintenance of sufficient habitat to recover endangered razorback sucker and Colorado pikeminnow in the Upper Colorado River : interim recommendations for the … In contrast, adults reside in more well-defined channels, where they seek eddy habitats and prey on suckers and minnows. Fish & Wildlife Service ECOS Environmental Conservation Online System Just better. Radio telemetry study area for 12 wild adult Colorado pikeminnow (Ptychocheilus lucius) tracked on the White, Green, and Yampa rivers, upper Colorado River basin, Colorado and Utah, 1992-1994. by Colorado pikeminnow (historic habitat) before dam completion. In contrast, adults reside in more well-defined channels, where they seek eddy habitats and prey on suckers and minnows. In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. The river segments shown in red on this map are critical habitat areas and necessary for fish recovery. The species are able to swim between the Colorado and Gunnison rivers with the aid of a fish passage at the Redlands Diversion Dam on the lower Gunnison, accumulating selenium and transferring the element to their … U.S.FWS Species profile about species listing status, federal register publications, recovery, critical habitat, conservation planning, petitions, and life history U.S. Habitat for the young fish is predominately alongshore backwaters and associated shorelines of more alluvial reaches of the turbulent and turbid rivers of the Colorado system. Beacham's Guide to the Endangered Species of North America. In the Green River, Wyoming, spawns July-August, apparently when water temperature is at least 20-22 C. In the lower Yampa River, western Colorado, apparently spawned as early as mid-June or as late as August in different years. Special protections and/or restrictions are possible in areas where federal funding, permits, licenses, authorizations, or actions occur or are required. Present distribution drastically reduced from original. The decline in pikeminnows has been especially pronounced in areas below reservoirs, which are characterized by extreme water temperature fluctuations, altered flow patterns, lower turbidity, De Ptychocheilus Lucius (voorheen squawfish) ptychocheilus Lucius is de grootste cyprinid vis van Noord-Amerika en een van de grootste ter wereld, met meldingen van individuen tot 6 ft (1,8 m) lang en een gewicht van meer dan 100 pond (45 kg). Fish and Wildlife Service, Fish and Wildlife Management Assistance Office, Roosevelt, Utah Timothy Modde U.S. Beacham's Guide to the Endangered Species of North America. Colorado pikeminnow are known to make long distance migrations for spawning and return to their home range where they inhabit deep runs, pools, and eddies. COLORADO RIVER EXPLORATIONS. Colorado pikeminnow. Habitat requirements of juvenile Colorado River squawfish. Colorado pikeminnow was once widespread throughout the Colorado River Basin (Holden & Wick, 1982; Miller, 1961), but during the last century suffered dramatic declines because of habitat fragmentation and environmental alteration (US Fish and Wildlife Service, USFWS, 1967). Pikeminnows are predatory feeders. •Dolores confluence with the Colorado is an area with documented aggregations of pre-spawn pikeminnow •1992 pikeminnow habitat evaluation concluded the Dolores potentially contained habitat to support all life stages of CPM but habitat was severely impacted by low base flows •Concluded that base flows of 20 to 40 cfs reduced native fish 50 cm TL in the Colorado River and Upper Colorado River from WY to NM management! Pikeminnow are primarily piscivorous ( fish-eaters ), but rein-troduction of the world 's biggest of! 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