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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 6:49:34 PM
Metadata
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UCREFRP
UCREFRP Catalog Number
7906
Author
Upper Colorado River Basin Instream Flow Team.
Title
Green River, Determination of Flow Needs Using the Physical Habitat Simulation System (PHABSIM) in the Green River, Utah - Draft.
USFW Year
1988.
USFW - Doc Type
\
Copyright Material
NO
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Water Resources Region 6, memo to Keith Rose, Project Leader, Endangered <br />Species, Grand Junction, 3 December 1987). Some changes in alluvial <br />reaches of the Island Park area (RM 330.6 to 329.4) were noteet, such that <br />some previous side channels had been filled with sedimentation and <br />vegetation resulting in a loss of island habitat. In general, however, <br />the Ruple Ranch study site, located within Dinosaur National Monument, was <br />considered stable and protected from industrial and agricultural <br />development. <br />1. Species Distribution <br />Species distribution for the Green River has been determined from <br />radiotelemetry, catch data, and other information (Tvus et. al 1987). This <br />information concludes that adult Colorado squawfish occupy a variety of <br />habitats including eddies and runs throughout this reach year round. <br />During the prespawning period when water temperatures range between 16 and <br />20 C, adult squawfish move through this area to specific spawning grounds. <br />Young squawfish are abundant soon after the spawning period in backwater <br />habitats. Little is known about the life history of the razorback sucker, <br />however collections of ripe males in this area has resulted in <br />classification of this reach as a suspected spawning area. <br />The biological importance of this reach is as follows: 1) Colorado <br />sguawfish: adult habitat year round; young-of-year nursery habitat from <br />mid-July to November 1; spawning habitat from mid-June to September; and <br />migration routes from mid-May to October (one month before and after <br />spawning), and 2) Razorback sucker: spawning habitat fran April to July <br />(FWS 1987; Tables 5 and 6). <br />22 <br />~~~ <br />
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