9540

• UCREFRP Catalog Number: 9540
• Author: Christopherson, K., G. J. Birchell and T. Modde.
• Title: Larval Razorback Sucker and Bonytail Survival and Growth in the Presence of Nonnative Fish in the Stipprup Floodplain.
• USFW Year: 2004.
• USFW - Doc Type: Salt Lake City, UT.
• Copyright Material: NO

~ Table 3. Razorback sucker capture data for the low-density enclosure at The Stirrup
floodplain wetland, Green River (RM 276.0) during each sampling period, July -
August 2002.
Date Number captured Cumulative total
July 31, 2002 159 0
August 2, 2002 141 159
August 7, 2002 27 300
~ August 9, 2002 32 327
Total 359
Table 4. Razorback sucker capture data for the high-density enclosure at The Stirrup
~ floodplain wetland, Green River (RM 276.0) during each sampling period, July
and August 2002.
Date Number captured Cumulative total
July 30, 2002 1,049 0
~ August 1, 2002 154 1,049
August 6, 2002 300 1,203
August 8, 2002 61 1,503
August 13, 2002 145 1,564
~ Total 1,709
The estimated (Peterson) number of razorback suckers in the high-density enclosure was
1,709 fish. The 95% confidence limits were between 1,709 and 1,896 fish (Table 2). The
Schumacher and Eschmeyer estimate for the high-density enclosure was 1,586 (Table 2). The
95% confidence limits were between 1,586 and 1,773. Survival ranged from 0.37 to 0.41 percent
(Table 5).
A total of 98 razorback suckers were removed from the control enclosure that equates to
~ a 9.8% survival rate. The control enclosure was very tight and escapement was likely not a
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