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Dissolved oxygen rarely dropped below 5.0 mg/1 at any time of day during the <br />study when data were collected. <br />Nonnative Fish Species Composition <br />In 2003 the enclosures were over-topped allowing all fish entrained in the wetland <br />access to the enclosures. Two enclosures were sampled to determine initial relative <br />abundance and composition of fish species present following initial inundation of the <br />experimental enclosures. Two 0.32 cm mesh fyke nets were set in each enclosure for one <br />night. These samples consisted primarily of young-of-the-year (YOY) carp (76.5% and <br />98.4%), followed by red shiner (Cyprinella lutrensis; 14.9% and 1.2%) and fathead <br />minnow (8.2% and 0.37%). Green sunfish, black bullhead, juvenile white sucker <br />(Catostomus commersonii) and sand shiner (Notropis stramineus) combined comprised <br />less than 1% of the catch (Table 3). <br />Table 3. Initial relative abundance and percent composition of fish species captured in <br />two experimental enclosures, June 2003. <br />Enclosure YOY Black Adult Black YOY Fathead Green Red Shiner <br />bullhead bullhead Carp minnow Sunfish <br />Number <br />3A 62 <br />3B 0 <br />4 18,327 1966 76 3583 <br />0 13,508 51 11 159 <br />Percent <br />Composition <br />3A 0.26% 0.02% 76.5% 8.2% 0.32% 14.9% <br />3B 98.4% 0.37% 0.08% 1.2% <br />Sampling in 2003, indicated the final nonnative species biomass composition was <br />75% common carp, 20% fathead minnow, 3% black bullhead, 2% green sunfish and less <br />9 <br />