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<br />Transactions of the American Fisheries Society 136:135&-1380, 2007
<br />@ Copyright by the American Fisheries Society 2007
<br />DOl: lO,1577(T05-303.1
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<br />Population Status of Colorado Pikeminnow in the
<br />Green River Basin, Utah and Colorado
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<br />
<br />KEVIN R. BESTGEN* AND JOHN A. HAWKINS
<br />
<br />Larval Fish Laboratory, Department of Fish, Wildlife, and Conservation Biology,
<br />Colorado State University, Fort Collins, Colorado 80523, USA
<br />
<br />GARY C. WHITE
<br />
<br />Department of Fish, Wildlife, and Conservation Biology,
<br />Colorado State University, Fort Collins, Colorado 80523, USA
<br />
<br />KEVIN D. CHRISTOPHERSON
<br />
<br />Utah Division of Wildlife Resources, Northeast Regional Office.
<br />152 East 100 North, Vernal, Utah 84078, USA
<br />
<br />J. MICHAEL HUDSON
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<br />Utah Division of Wildlife Resources, Moab Field Station,
<br />1165 South Highway 191, Suite 4, Moab, Utah 84532, USA
<br />
<br />MARK H. FULLER AND D. CHRIS KITCHEYAN
<br />U.S. Fish and Wildlife Service. 1380 South 2350 West, Vernal, Utah 84078, USA
<br />
<br />RONALD BRUNSON
<br />
<br />Utah Division of Wildlife Resources, Northeast Regional Office,
<br />152 East 100 North, Vernal, Utah 84078, USA
<br />
<br />PAUL BADAME
<br />
<br />Utah Division of Wildlife Resources, Moab Field Station,
<br />1165 South Highway 191, Suite 4, Moab, Utah 84532, USA
<br />
<br />G. BRUCE HAINES
<br />U.S. Fish and Wildlife Service, 1380 South 2350 West, Vernal, Utah 84078, USA
<br />
<br />JULIE A. JACKSON
<br />
<br />Utah Division of Wildlife Resources, Moab Field Station,
<br />1165 South Highway 191, Suite 4, Moab, Utah 84532, USA
<br />
<br />CAMERON D. WALFORD AND TASHA A. SORENSEN
<br />
<br />Larval Fish Laboratory, Department of Fish, Wildlife, and Conservation Biology,
<br />Colorado State University, Fort Collins, Colorado 80523, USA
<br />
<br />Abstract.--Capture-recapture sampling of 819 km of streams in the Green River subbasin, Utah and
<br />Colorado, of the Colorado River basin was conducted in 2000-2003 to estimate population demographic
<br />parameters and recovery status for endangered Colorado pikeminnow Ptychocheilus lucius. Parameter
<br />estimates from a Huggins robust-design, multistratum model suggested a basinwide decline in the abundance
<br />of adult (total length, ::::450 mm) Colorado pikeminnow. Reductions were most severe in the middle Green
<br />River (59%) and White River (63%), the two largest population segments, Reductions were less severe in the
<br />Yampa River (29%), Desolation-Gray Canyon (11 %), and lower Green River reaches (36%). In 2001, the
<br />flIst year the entire subbasin was sampled, adult Colorado pikeminnow abundance was estimated at 3,304 fish
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<br />* Corresponding author: kbestgen@wamercnr.colostate.edu
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<br />Received November 30, 2005; accepted October 3, 2006
<br />Published online August 30, 2007
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<br />[Article]
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