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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:11:06 PM
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UCREFRP
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
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Table 7. Numbers and percent composition by biomass of nonnative fish species <br />collected in each experimental enclosure in the Baeser floodplain wetland, <br />Green River (RM 273): 2004. <br />Enclosure Carp Fathead <br />minnows Green sunfish Shiners <br /> # % # % # % # % <br />lA 5392 96.4 14 0.3 184 3.3 4 0.1 <br />1B 4712 67.9 156 2.3 2069 29.8 0 0 <br />ZA 6138 91.6 96 1.4 458 6.8 9 0.1 <br />2B 7895 80.8 373 3.8 1494 15.3 6 0.1 <br />3A 10348 90.3 1024 8.9 82 0.7 0 0 <br />3B 8654 78.5 2345 21.3 10 0.1 8 0.1 <br />4A 5922 71.0 2081 23.0 328 3.9 6 0.1 <br />4B 3916 55.7 2599 36.9 285 4.1 202 2.9 <br />SA 8575 48.1 1840 10.3 7410 41.5 15 0.1 <br />SB 4255 30.5 5731 41.0 3894 27.9 92 0.7 <br />6A 6672 70.9 2710 28.8 17 0.2 8 0.1 <br />6B 6391 73.2 1856 21.3 488 5.6 1 0.01 <br />Average 71.24 16.61 11.6 0.36 <br />Total 78870 20825 16719 351 <br />Razorback Sucker Survival and Growth <br />In 2004, larval razorback sucker survival was confirmed in all twelve enclosures <br />(Table 8 and Figure 1). Depletion of razorback sucker and bonytail was achieved <br />through multiple sampling of each enclosure. All enclosures, with the exception of the <br />two high density enclosures stocked at a density of 40,000 larvae/acre, showed sufficient <br />depletion to allow an abundance estimate using linear regression (Table 8). Survival <br />ranged from 58% in an enclosure where larvae were stocked at a density of 800 <br />larvae/acre to 2% in the highest density enclosure where larvae were introduced at a <br />density of 40,000 larvae/acre. <br />The survival estimate of 58% for the enclosure where larvae were introduced at a <br />density of 8001arvae/acre is significantly higher (Student's t, P < 0.01) than the survival <br />estimates of the other enclosures. There was no statistically significant difference in the <br />15 <br />
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