The Colorado pikeminnow, formerly the Colorado squawfish, is the largest American minnow (up to 6 feet long and 80 pounds in size). Adult Colorado pikeminnow collected on the Green River in Desolation Canyon, Utah. It was first listed as endangered in 1967 and was given full protection under the Endangered Species Act in 1973. HABITAT: The Colorad o pikeminnow inhabits medium to large rivers. given full protection under the Endangered Species Act of 1973. Walleye is a prized food fish, but its voracious appetite for pikeminnow is proving to be a setback to expectations that the pikeminnow could be removed from the endangered species list. In 1998, the Endangered Status for the pikeminnow was changed to Threatened under Colorado law. It is an elongated pike-like fish with a dusky-greenish, slender body with gold flecks on the dorsal (upper) surface. Colorado State University, Colorado Cooperative Fish and Wildlife Research Unit 201 Wagar Building, Fort Collins, Colorado 80523, USA Abstract.—Status of the Colorado River population of the endangered Colorado squawfishPtych-ocheilus lucius (recently renamed the Colorado pikeminnow) was investigated by (1) estimating Endangered status: The Colorado pikeminnow is listed as threatened in Colorado and endangered federally. Today, two wild populations of Colorado pikeminnow are found in the Upper Colorado River Basin – one in the upper Colorado River system and one in the Green River system. These are entirely different species from Colorado pikeminnow, much as bald eagles are different from golden eagles. Essential habitats, including primary migration routes and required stream flows are legally protected. But now, due to construction of large dams in rivers within the Colorado River basin, the Colorado pikeminnow is now mostly restricted to Utah and Colorado. Unlike the endangered Colorado pikeminnow, northern pikeminnow are able to thrive despite habitat alterations resulting from the installation of dams and introductions of nonnative fish species. ... Chuck and other old-timers used to catch these fish in the Upper Colorado River Basin along with Colorado pikeminnow and razorback sucker. The Green River adult population declined and then increased in the beginning years of this century. This fish also readily strikes lures and live bait used to catch sport fish or nonnative fish. Fish and Wildlife Service under the Endangered Species Act in 1967. Adult pikeminnows use various habitats which include deep, turgid, strongly flowing waters, eddies, runs, flooded bottoms or backwaters (especially during high flows). Last week I wrote about the desperate condition of our state fish, DIET: Young pikeminnows feed on insects and plankton. Upper Colorado River Endangered Fish Recovery Program, Instream Flow Identification & Protection, 1988 Cooperative Agreement, 2001 & 2009 Extensions, Annual Budget and Depletion Charge Adjustments, San Juan River Recovery Implementation Program, Grand Canyon Monitoring & Research Center, Glen Canyon Dam Adaptive Management Program. Today, specimens rarely exceed 5 pounds. The Colorado pikeminnow, razorback sucker, humpback chub and bonytail are endangered fish species that once thrived in the Colorado River system. The Colorado Pikeminnow had nowhere to hide. Listed as endangered by U.S. The Colorado pikeminnow is adapted to warm rivers and requires uninterrupted passage and a hydrologic cycle characterized by large spring peaks of snowmelt runoff and lower, relatively stable base flows.