9699

• UCREFRP Catalog Number: 9699
• Author: Brunson, R.E., and K.D. Christopherson.
• Title: Larval razorback sucker and bonytail survival and growth in the presence of nonnative fish in the Baeser floodplain wetland of the middle Green River.
• USFW Year: 2005.
• USFW - Doc Type: Utah Division of Wildlife Resources, Vernal, Utah.
• Copyright Material: NO

These bonytail ranged from 57 to 83 mm total length with a mean length of 70 mm and a
mean growth rate of 0.6 mm/day. Surviving bonytail were transferred to The Stirrup
floodplain wetland.
2004
Nonnative fish species composition
In 2004, overall nonnative species composition by biomass was 71% common
carp, 17% fathead minnows, 12% green sunfish and less than 1% combined total black
bullhead, red shiners and sand shiners. A total of 78,870 carp, 20,825 fathead minnow,
16,719 green sunfish and 351 red shiners were collected in fyke net samples (Table 7).
The high numbers of young carp captured following the initial introduction of
only two age 1+ carp, indicated that the enclosures were not secure. It is presumed that
YOY carp gained access to the enclosures as fry through seams in the enclosure panels or
through a gap at the bottom of the enclosure tarp and adult carp entered the enclosures by
jumping over the enclosure walls. Water levels were near the top of the enclosure walls
for several weeks in 2004 during which time adult carp were observed jumping in and
near the enclosures.
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