6027

• UCREFRP Catalog Number: 6027
• Author: Tyus, H. M., R. L. Jones and L. A. Trinca.
• Title: Green River Rare and Endangered Fish Studies, 1982-85
• USFW Year: 1987.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

LIST OF FIGURES
Figure 1. The hydrologic subregions of the Upper Colorado River Basin
(After Joseph e[ al. 1977) ..................................... 5
Figure 2. Upper Colorado River basin ..................................... 6
Figure 3. Movement of radio-implanted migratory Colorado aquawfish,
1980-1985. tributary streams; ____ high use spawning
reach .......................................................... 29
Figure 4. Confirmed spawning and nursery areas, Green River Basin........ 34
Figure 5. Illustration of depth and mean water column tranaections
at the location of radiotagged Colorado aquawfish.
Depths drawn to scale; arrows are vectors of velocity.......... 40
Figure 6. Mean daily discharge for 1979-1980 and 1983-1984 at
Jensen, Utah ................................................... 46
Figure 7. Migration of radiotagged Colorado squawfiah (-), collections of
ripe fish (--), and estimated spawning dates from larvae (" ),
compared as indicatora'of the time of spawning ................. 49
Figure 8. Mean annual catch of age-0 Colorado squawfiah, (up to 70 mm TL)
Green River, 1979 - 1985 ....................................... 52
Figure 9. Green River discharge temperatures at Flaming Gorge,
1979-1983. (Courtesy of U.S. Bureau of Reclamation)........... 54
Figure 10. June-October mean daily discharge for 1979-1985 at
Jensen, Utah USGS gauging station (RM 301.8 (RK 483)).......... 56
Figure 11. Relationship between catch-per-unit-effort (fish/1000 m2) of
young Colorado squawfiah in backwater habitat and mean
August-September discharge in the Green River, 1979-1985....... 58
Figure 12. Relationship between mean total length of young Colorado
aquawfish in October, and mean August and September discharge
in the Green River, 1979-1984 ... ............................... 60
Figure 13. Precaudal vectebrae and gill rakers (2nd arch), Gila app.
(after Smith et al. 1979). Histograms indicate number of
specimens that occurred in that range .......................... 72
v