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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 7:40:02 PM
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UCREFRP
UCREFRP Catalog Number
8170
Author
Trammell, M. A., K. D. Christopherson, C. L. Rakowski, J. C. Schmidt, K. S. Day, C. Crosby and T. E. Chart.
Title
Flaming Gorge Studies
USFW Year
1999.
USFW - Doc Type
Assessment of Colorado Pikeminnow Nursery Habitat in the Green River.
Copyright Material
NO
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<br />Seinin has been su ested as a removal techni ue for nonnative c rinids in backwaters <br />g gg q YP <br />(Lentsch et al. 1996). The rapid removal of the majority of fish in the first three or four passes <br />suggests a minimum of three seining passes should be made to ensure adequate removal offish <br />from a backwater. The three pass seining removal could also be used to generate population <br />estimates of young Colorado pikeminnow in backwaters. <br />CONCLUSIONS <br />1) Determine the relationship between availability, formation, and maintenance of Colorado <br />pikeminnow nursery habitat and test release flows from Flaming Gorge Dam. <br />- Establishing a single discharge that is intended to maximize habitat availability every <br />yeaz is inappropriate. Year to yeaz baz topography, and hence habitat availability <br />changes annually. The dischazge that maximizes habitat availability also changes each <br />year, and the habitat availability curve in any year has multiple modes. <br />- As measured at Oura at com ara s <br />y p ble base flows of 45 m /s (1590 cfs) m the summers of <br />1992, 1993 and 1994, total habitat area decreased in 1993 from 19921evels, although <br />azea of deep (quality) habitat increased. In 1994, total habitat area increased, but deep <br />(quality) habitat decreased substantially. <br />i - On the study bar at Ouray, the 1993 peak flow of 570 m3/s (20130 cfs) simplified bar <br />topography and raised bar elevations. Secondary (scour) channel habitat was available <br />at 50-136 m3/s (1765 cfs), and maximized between 100 and 136 m3/s (3530-4800 cfs). <br />The 1994 peak flow of 330 m3/s (11655 cfs) lowered bar elevations. Superimposed bars <br />added shoreline complexity. Several small habitats were available at flows of 50-90 <br />m'/s (1765-3180 cfs). Secondary (scour) channel habitat was available at flows from <br />100 to 136 m3/s 3530-4800 cfs). <br /> - Total and quality habitat availability iri the fall was negatively correlated with high <br /> spring flows at Ouray and Mineral Bottom. Number of backwaters was not correlated <br /> with flow. <br /> - <br />Habitat availability was also negatively associated with high flows at the time of <br /> sampling, although not significantly correlated. <br /> - Habitat availability in the summer and fall at Ouray and Mineral Bottom was minimized <br /> at sampling flows greater than 141 m3/s (5000 cfs), and maximized but variable at <br /> sampling flows from 56 to 113 m3/s (2000 to 4000 cfs) at Mineral Bottom. <br />2) Develop definitions for habitat types based on fluvial geomorphological processes. <br />- General habitat descriptions of large scale habitat features were developed, and used by <br />the biological sampling. More specific habitat types were defined for the study bar and <br />xiv <br />
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