9556

• UCREFRP Catalog Number: 9556
• Author: Bestgen, K. R., K. A. Zelasko and C. T. Wilcox.
• Title: Non-native fish removal in the Green River, Lodore and Whirlpool canyons, 2002-2006, and fish community response to altered flow and temperature regimes, and non-native fish expansion.
• USFW Year: 2007.
• USFW - Doc Type: 115,
• Copyright Material: NO

electrofishing and trammel net surveys with results of previous studies, particularly
Bestgen and Crist (2000) and Bestgen et al. (2006).
Objective 2. Determine if shifts in distribution and abundance of small-bodied fishes
occurred in Browns Park and Lodore Canyon by comparing results of seining low-
velocity, nearshore areas with results of previous studies, particularly Bestgen and
Crist (2000) and Bestgen et al. (2006).
Objective 3. Determine if Colorado pikeminnow spawn in the Green River upstream
of the Yampa River confluence by establishing a larval drift station in lower Lodore
Canyon, and by summer sampling to determine presence of ripe adults.
Objective 4. Collect data from the hydrological records for two time periods (WY
1992-1996 vs. 1997-2006) as recorded by the U. S. Geological Survey at the
Greendale, Utah gaging station (09234500).
Objective 5. Collect main channel temperatures in Browns Park and Lodore Canyon
in coordination with other ongoing efforts.
Objective 6. Compare and contrast the summer thermal regime of the Green River
through Browns Park and Lodore Canyon for two time periods (WY 1991 to 1996 vs.
1997 to 2006). Temperature models will be used to generate thermal regimes, where
empirical data are lacking.
Goal: Continue to monitor the effect of fish removal efforts and Flaming Gorge operations on
the fish community in Lodore and Whirlpool canyons.
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