============================================================ SPECIES | 1957 | 1958 | 1959 ----------------------------------+--------+-------+-------- Big-mouthed Buffalo...............| ...... | T[D] | T Small-mouthed Buffalo.............| ...... | ..... | T River Carpsucker..................| T | 0.8 | 1.8 Golden Redhorse...................| T | 3.0 | 5.7 Creek Chub........................| ...... | T | 0.8 Red-finned Shiner.................| 1.3 | 3.0 | 0.8 Red Shiner........................| 6.5 | 13.1 | 12.1 Ghost Shiner......................| T | T | ...... Blunt-nosed Minnow................| T | T | T Fat-headed Minnow.................| T | T | 1.4 Stoneroller.......................| 0.8 | 1.5 | 3.5 Black Bullhead....................| 40.8 | 30.5 | 32.0 Yellow Bullhead...................| 5.3 | 8.8 | 2.5 Channel Catfish...................| 28.4 | 15.5 | 18.5 Flathead..........................| T | T | T Stonecat..........................| T | T | 1.4 Spotted Bass......................| T | T | 0.8 Largemouth........................| T | T | T Green Sunfish.....................| 3.1 | 6.8 | 6.4 Long-eared Sunfish................| 8.8 | 3.7 | 1.9 Orange-spotted Sunfish............| 3.1 | 8.9 | 2.5 Bluegill..........................| T | T | T White Crappie.....................| T | ..... | T Logperch......................... | T | 2.1 | 0.8 Slender-headed Darter.............| 0.6 | 0.6 | 3.1 Orange-throated Darter............| ...... | T | 2.5 Total number of fish..............| 786 | 965 | 513 Size of sample-area in acre-feet..| .002 | .33 | .33 ----------------------------------+--------+-------+-------- [D] T denotes less than one-half of one per cent of the population. Channel catfish also showed a slight decline in relative abundance after 1957, resulting from mortality in the 1957 year-class. With continuous flow, channel catfish will probably remain abundant, although annual reproductive success probably will be less than in 1957. The big-mouthed buffalo, small-mouthed buffalo, creek chub and orange-throated darter were not taken in 1957, but appeared in collections in 1958. The river carpsucker, golden redhorse, red shiner, fat-headed minnow, stoneroller, stonecat, and slender-headed darter also increased in abundance between 1957 and 1959. The increased abundance of all these species in 1958 and 1959 resulted in a more diversified fauna, with lesser predominance by any single species, than in 1957 (Table 12); this change is related to the increased, permanent flow in 1958 and 1959. Local Variability of the Fauna in Different Areas at the Upper Neosho Station, 1959