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than 1% red shiners. Nonnative species composition was relatively consistent among <br />enclosures, with the exception of significantly higher (Student's t, P < 0.01) composition <br />of YOY black bullhead (16.9%) in and enclosure stocked at a density of 4,000 larvae/acre <br />(Table 4). A total of 4,943 black bullhead, 113,907 carp, 23,178 fathead minnow, 2,557 <br />green sunfish and a combined total of 1,380 for red shiner and sand shiner were collected <br />from the enclosures over the four sample periods. <br />Table 4. 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), 2003. <br />Enclosure Black Carp Fathead Green Shiners <br />bullhead (sub-adult) minnow sunfish <br /> <br />lA 68 0.9 5,429 73.3 1,635 22.1 226 3.1 51 0.7 <br />1B 24 0.4 2,863 52.8 2,417 44.5 90 1.7 33 0.6 <br />2A 86 1.8 3,423 71.3 1,021 21.3 236 4.9 36 0.7 <br />2B 56 1.2 2,836 63.0 1,505 33.4 69 1.5 36 0.8 <br />3A 723 4.4 13,010 79.3 1,947 11.9 427 2.6 305 1.9 <br />3B 3,043 16.9 13,431 74.5 1,291 7.2 32 0.2 234 1.3 <br />4A 169 1.5 7,765 70.5 2,617 23.7 276 2.5 194 1.8 <br />4B 245 1.5 12,246 76.1 2,766 17.2 606 3.8 237 1.5 <br />SA 71 0.4 16,987 87.8 2,169 11.2 60 0.3 66 0.3 <br />SB 202 1.5 11,899 87.5 1,237 9.1 97 0.7 159 1.2 <br />6A 205 1.1 16,435 87.7 1,747 9.3 354 1.9 0 0 <br />6B 51 0.5 7,583 71.7 2,826 26.7 84 0.8 29 0.3 <br />Average 2.68 74.63 19.8 2 0.93 <br />Total 4,943 113,907 23;178 2,557 1,380 <br />Razorback Sucker Survival and Growth <br />In 2003, depletion of razorback sucker in the enclosures was achieved by <br />sampling each enclosure using three fyke nets set over four nights. All enclosures showed <br />sufficient depletion to allow an abundance estimate with 95% confidence intervals using <br />linear regression (Table 5 and Figure 1). Estimated survival of larval razorback sucker <br />10 <br />