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14 I ,I :1 I I I I If I I I I I I I I ,I I I (Table 10). Native species included fJannelmouth sucker (39%), bluehead sucker 139%), and roundtail chub (12%) and composed 90% of the estimated fish community. Nonnative species included only white sucker (4%) and common carp (6%). At the lower-site, 61 fish were estimated to reside in the baseflow pool including the same species captured at the upper site with the addition of channel catfish which were not present in the upper~site pool. We were unable to calculate an abundance estimate for all species in the lower-site pool because too few fish were captured on each sampling occasion, so abundance was calculated as the sum of all individuals captured of those species. Native species outnumbered nonnatives and composed 75% of the 61 fish estimated to reside in the lower-site poollTable 10). In all seasons and reaches combined, six of the eight small-bodied species collected were nonnatives and three non natives; sand shiner, redside shiner, and red shiner; composed 70% of all small-bodied species collected (Table 8). Red shiner, fathead minnow, and plains killifish while rare or absent in spring collections. Native species included speckled dace (28%) and mottled sculpin (0.2%). Only sand shiner, speckled dace, and redside shiner were consistently collected in all reaches and seasons. Seasonal changes in abundance were most apparent with redside shiner which decreased in abundance from 49% in spring to 5 % in autumn (Table 8). Changes in relative abundance of small-bodied species were most apparent among reaches. Redside shiner abundance decreased in downstream reaches, while sand shiner and red shiner abundance increased in downstream reaches (Table 9). Other species were collected in low numbers in all reaches. Mottled sculpin were rarely collected in all reaches and seasons probably because they live in riffles which were not frequently sampled. Other small-bodied fishes and including nonnative fathead minnow, plains killifish, and creek chub were rare in all samples.