9714

• UCREFRP Catalog Number: 9714
• Author: Ward, D., and W. Persons.
• Title: Little Colorado River fish monitoring 2004 annual report.
• USFW Year: 2005.
• USFW - Doc Type: Arizona Game and Fish Department.
• Copyright Material: NO

FIGURES......................................................................................................................................20

Figure 1. Lengthfrequency distributions for humpback chub (HBC), caught in the Little
Colorado River during the most recent 6 years of monitoring . ................................................20

Figure 2. Lengthfrequency distributions offlannelmouth sucker (FMS), caught in the Little
Colorado River during the most recent 6 years of monitoring. ................................................21

Figure 3. Lengthfrequency distributions of blue head sucker (BHS), caught in the Little
Colorado River during the most recent 6 years of monitoring. ................................................22

Figure 4. Mean daily flow of the Little Colorado River during the sampling period in 2004.
USGS gauge above confluence with the Colorado River. ........................................................ 23

Figure 5; Mean daily turbidity (NTU's) in the Little Colorado River during 2004 sampling

measured at Boulder Camp. ..................................................................................................... 23

Figure 6. Species composition in standardized hoop net monitoring, 1987 - 2004. ............... 24

Figure 7. Daily water and air temperature (DC), at Boulder camp, LCR 2004. ..................... 24

Figure 8. Daily water temperature fluctuations in the Little Colorado River as measured with
an hourly Hobotemp@ data logger. .......................................................................................... 24

Figure 9. Mean catch/hr of humpback chub for four size groupings in the LCR, 1987 - 2004.

...................................................................................................................................................25

Figure 10. Mean catch/hr of flannelmouth sucker> 150 mm, Bluehead sucker> 15 0 mm and
all sizes of speckled dace in the LCR, 1987 - 2004. .................................................................26

Figure 11. Mean catch/hr of nonnative fishes in the LCR, 1987-2004.................................... 27

Figure 12. Mainstem Colorado River water temperature above the Little Colorado River.
Cloud ofpoints represents 1990 - 2002 water temperatures. ..................................................28

Figure 13. Potential explanation for the humpback chub CP UE trends observed since 1987.
Two different carrying capacities based on different amount of area available as humpback

chub habitat. ............................................................................................................................. 28

Figure 14. Number of years at large for humpback chub recaptured during Little Colorado
River sampling in 2004. This analysis includes year of initial tagging as well as all

subsequent captures. ................................................................................................................. 29

Figure 15. Number of years at large for flannelmouth suckers recaptured during Little
Colorado River Monitoring in 2004. Includes initial capture as well as subsequent captures.

...................................................................................................................................................29

APPENDIX ...... ...... ...... ...... ....... .... .... .... ...... ....... .......... .... .... ..... ...... ........ .... ......... ........ ...... .......... 30

2004 Humpback chub recapture summary ...............................................................................30
2004 Flannelmouth sucker recapture summary.......................... ............ ........ ......................... 32
2004 Bluehead sucker recapture summary............................................................................... 32

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