9539

• UCREFRP Catalog Number: 9539
• Author: Trammell, M., S. Meismer and D. Speas.
• Title: Nonnative Cyprinid Removal in the Lower Green and Colorado Rivers, Utah.
• USFW Year: 2004.
• USFW - Doc Type: Salt Lake City, UT.
• Copyright Material: NO

Figure 8. Green River: Mean CPE (fish/10m2) of nonnative cyprinids captured in five unique
treatment backwaters which were sampled on five consecutive removal trips each year from
1998 to 2000 (upper). CPE in five unique backwaters sampled in 1998 (lower) ................... 39
Figure 9. Green River: CPE (fish/10m2) on four consecutive removal passes (seine hauls) in four
unique backwaters sampled on five consecutive removal trips in 1998 ..................... 40
Figure 10. Green River: Comparison of long-term mean CPE (fish/10m2) of ISMP from 1986 to 1997
to post-removal CPE (1998 to 2000) for nonnative cyprinids (NNC) and Colorado
pikeminnow (CS) Solid line indicates long-term mean CPE, dashed lines indicate 95%
confidence intervals ................................................................................................ 41
Figure 11. Colorado River: Length frequency distribution of Colorado pikeminnow captured in
treatment and control reaches (combined) from 1998 to 2000 .......................................... 42
Figure 12. Colorado River: percentages of native and nonnative fishes in treatment and control
reaches, 1998 to 2000 ............................................................................................. 43
Figure 13. Colorado River: numbers of adult (>40 mm) and subadult (<40 mm) nonnative cyprinids
in treatment and control reaches from 1998 to 2000 ....................................................... 44
Figure 14. Colorado River: Mean CPE (fish/10m2) of nonnative cyprinids (NNC) and Colorado
pikeminnow (CS) captured in treatment and control reaches from 1998 to 2000. Error bars
represent two standard errors ................................................................................... 45
Figure 15. Colorado River: Mean CPE (fish/10m2) of nonnative cyprinids captured on consecutive
removal trips in treatment and control reaches from 1998 to 2000. Error bars represent two
standard errors ...................................................................................................... 46
Figure 16. Colorado River: Mean CPE of nonnative cyprinids (fish/10m2) in three distinct treatment
and control reaches ................................................................................................ 47
Figure 17. Colorado River: Mean CPE (fish/10m2) of subsequent seine hauls (passes) in two
individual backwaters (RM 60.3 and RM 90.5) sampled on two consecutive trips in 1998... 48
Figure 18. Colorado River: Comparison of long-term mean CPE (fish/10m2) of ISMP from 1986 to
1997 to post-removal CPE (1998 to 2000) for nonnative cyprinids (NNC) and Colorado
pikeminnow (CS) .................................................................................................... 49
Figure 19. Captures of nonnative cyprinids in the Green and Colorado rivers during ISMP sampling
1986-1997 and annual peak discharge (USGS Green River at Green River, Utah Gage
#09315000, and USGS Colorado River at Cisco, Utah Gage #09180500) ......................... 50
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