8159

• UCREFRP Catalog Number: 8159
• Author: Trammell, M. and T. Chart.
• Title: Aspinall Studies
• USFW Year: 1999.
• USFW - Doc Type: Annual Assessment of Colorado Pikeminnow Larval Production in the Colorado River, Utah 1992-1996 \
• Copyright Material: NO

LIST OF FIGURES (continued)
Figure 7. Correlation of peak discharge with average monthly flows May-September ... 40
Figure 8. Relationship of hydrograph and the onset of Colorado pikeminnow spawning,
Colorado River, 1992-1996 ......................................... 41
Figure 9. Relationship of river temperatures and the onset of Colorado pikeminnow
spawning, Colorado River, 1992-1996 ................................ 42
Figure 10. Relationship of average June flow with dates of the onset of Colorado
pikeminnow spawning, and date the Colorado River reached 18°C, from 1992-
1996 ...........................................................43
Figure 11. Catch rates (#/1000 m3) of Colorado pikeminnow (CPM), other Natives, non-
native cyprinids (NNC), and all fish combined, collected in drift samples at
Westwater and Moab, Colorado River, 1992-1996 .......................44
Figure 12. Correlation of larval Colorado pikeminnow transport abundance and fall
juvenile abundance, Colorado River, 1992-1996 .........................45
Figure 13. Average total length of Colorado pikeminnow in summer, fall and spring, 1992-
1997, and overwinter survival as a function of total length in the fall ........ 46
Figure 14. Relationship of peak flows with summer and fall habitat availability and non-
native cyprinid (NNC) abundance, lower Colorado River, 1992-1996........47
vi