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<br />.1110V93 <br /> <br />16:48 <br /> <br />'Zf <br /> <br />SEN CAMPBELL <br /> <br />~010 <br /> <br />u. S. FISH AND VILDLIFE: SEllVICE <br /> <br /> <br />Fish & Wadlife Service <br />For more informiltion c:ont~~: <br />Public Affairs <br />U.S. FISh and WDdlife Service <br />Region 6 <br />P.O. Box 25486. DFC <br />OenvCl, CO 80225 303-2.36-7904 <br /> <br />Humpback chub (GUa cypha) <br /> <br /> <br />20 Inches <br /> <br />Stiltus: <br />o Listed as endangered by U.S. Fish and Wildlife Service in 1964; given full protection under the Endangered <br />Species Act af 1973 <br />a Endangered under Colorado law since 1976 <br />o Listed as "protected" in Utah since 1973 <br />o On Arizona list of threatened and endangered species since 1975 <br />o Humpback Chub Recovery Plan apploved August 22. 1979: first revision May 15. 1984; second revision <br />September 19. 1990 <br /> <br />DescriDtion: <br />The prDnounced hump behind its head gives the humpback chub II striking. unusual appearance. A member of <br />the minnow family, the humpback chub has a brown or olive-colored back and sUver sides, small eyes ilnd a long <br />snout that over hangs its jaw. It can grow to nea~y 20 inches and may survive more than 30 years in the wild. <br /> <br />The Humpback chub is thought to have evolved about 10,000 years ago. Humpback chub populations in the <br />Little Colorado River and ~t Black Rocks in the Colorado River appear relatively stable in number of fish. but <br />declines have been ~pparent in other locations. <br /> <br />Distribution: <br />Historically. the humpback chub inhabited portions of the Color~do River and four of its tributaries: the Green. <br />Yampa. White and Little Colorado rivers. Now. the I~rgest known populations are in the Little Colorado River in <br />the Grand Canyon. where there may up to 10.000 fish. and in the Colorado Rive, near the CQloradolUtah border. <br />Smaller numbers have been found in the Yampa and Green ,ivers in Dinosaur National Monument. Desolation and <br />Gr~y canyons on the Green river in Utah. Cataract Canyon on the Colorado River in Utah and the Colorado River <br />in Arizona. <br /> <br />Habitat: <br />Humpback chub spawn soon after the highest spring flows ( May.July) when water temperatures approach 20 <br />degree Celsius. Generally. the species is associated with boulder-strewn canyons. travertine dams. pools. <br />eddies. shorelines. and backwaters. <br /> <br />9 <br />