1), Flaming Gorge Dam (US Bureau of Reclamation 2006, pp. At Red Fleet Reservoir, chemical treatment also provided the Utah Division of Wildlife Resources with the ability to establish a new fish community that supported angling interests and provided greater compatibility with downstream conservation efforts. These three units support the genetic diversity of the species and there is adequate exchange of individuals between populations in the upper basin. documents in the last year, 999 The resources of highest concern in the upper basin are river flows. He may, for example, permit taking, but not importation of such species or he may choose to forbid both taking and importation but allow the transportation of such species” (H.R. As noted in the legislative history when the Act was initially enacted, “once an animal is on the threatened list, the Secretary has an almost infinite number of options available to him with regard to the permitted activities for those species. Water use and delivery in the Colorado River basin is strictly regulated under existing Federal, State, and tribal laws commonly referred to as the “Law of the River”, including, but not limited to, the Colorado River Compact of 1922, the Upper Colorado River Basin Compact of 1948, the Colorado River Storage Project Act of 1956, the Colorado River Basin Project Act of 1968, and individual state and tribal statutes that regulate water appropriation. (2) Investigate the mainstem Colorado River's role in the Grand Canyon population. The species is currently monitored at the remaining five extant, or occupied, locations: Desolation and Gray Canyons (the Green River in Utah), Black Rocks (the Colorado River in Colorado), Westwater Canyon (the Colorado River in Utah), Cataract Canyon (the Colorado River in Utah), and Grand Canyon (the Colorado and Little Colorado rivers in Arizona). Warmer releases from Lake Powell could also impact abundance and distribution of nonnative fish in the Grand Canyon. Although nonnative smallmouth bass have been documented near multiple populations of humpback chub, smallmouth bass have yet to establish in most humpback chub habitats. That adaptation coupled with large, curved fins allows the species to maintain position in the turbulent flows. RANGE: Humpback chub are found in the Little Colorado River. var today = new Date(); The humpback chub is a fish endemic to the warm-water portions of the Colorado River basin of the southwestern United States. Two to three thousand adults can occur in the Black Rocks and Westwater Canyon core population in the Colorado River near the Colorado/Utah border. Humpback chub individuals may be introduced to new areas by translocating wild individuals to additional locations or by stocking individuals from captivity. We also evaluated the effects of stressors that may operate cumulatively, such as low river flows and warm water temperatures that may act cumulatively to increase predation by nonnative predators. State agencies, because of their authorities and their close working relationships with local governments and landowners, are in a unique position to assist the Services in implementing all aspects of the Act. Currently, resource conditions are adequate and support a large, stable population in the lower basin and multiple persistent populations in the upper basin. The Dinosaur National Monument, Desolation and Gray Canyons, Black Rocks, Westwater Canyon, and Cataract Canyon populations are the “upper basin populations,” and the Grand Canyon population is the “lower basin population.”. If monitoring indicates that angling has a negative effect on the conservation of humpback chub in the opinion of the Service, the fishing regulations must be amended or the fishery could be closed by the appropriate State.