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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 7:27:44 PM
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UCREFRP
UCREFRP Catalog Number
9443
Author
Bestgen, K. R., G. B. Haines, R. Brunson, T. Chart, M. Trammell, R. T. Muth, G. Birchell, K. Chrisopherson and J. M. Bundy.
Title
Status of Wild Razorback Sucker in the Green River Basin, Utah and Colorado, Determined From Basinwide Monitoring and Other Sampling Programs.
USFW Year
2002.
USFW - Doc Type
Project Number 22D,
Copyright Material
NO
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<br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />i <br />capture compared to flow and temperature regimes gathered from U.S. Geological Survey gauges <br />or other sources (pers. comm., G. Smith, U.S. Fish and Wildlife Service, Denver, CO). <br />Temperature data were average daily or instantaneous readings. Winter and early spring <br />temperatures (through mid-April) for the middle Green River gauge at Jensen, Utah were not <br />available in 1998 and 1999 but were estimated from the average of daily readings collected from <br />1980 to 1997. Lower Green River data were from the gauge at Green River, Utah. <br />RESULTS <br />Razorback sucker distribution.-Since 1992, wild adult razorback suckers were captured <br />throughout most segments of the Green River Basin, including the lower and middle Green <br />River, at the confluence of the San Rafael River, in the lower Yampa River, and in the Green <br />River in Lodore Canyon. We used distributional data collected only since 1992 because other <br />investigators had reported data collected prior to then (Modde et al. 1996). During 1996 to 1999 <br />Basinwide and other sampling, most effort and captures (97%, N = 118 unique fish) were <br />concentrated in the middle Green River from upstream of the White River to just below Split <br />Mountain Canyon (Fig. 2). Most fish captured in the middle Green River were from the <br />Escalante reach (4b %), whereas fewer were captured in the Ouray (32 %) and Jensen (22 %) <br />reaches. Most razorback suckers (70 %) captured in the middle Green River from 1996 to 1999 <br />were from just three locations, the Escalante Ranch spawning sites (RK 500.4), Ashley Creek <br />(RK 481), and near Old Charlie Wash (RK 401.4 to 401.6). Most adult razorback suckers were <br />captured in May (56 %) or June (37 %). Adult razorback suckers were very rare in other portions <br />of the Green River Basin. Only two adults were taken in each of the lower Yampa (RK 0.0 to <br />11 <br /> <br />
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