Graham (1885:72) and Cragin (1885:107) reported _Ictiobus velifer_ (= _Carpiodes velifer_) from "Eureka Lake," Riley County, Kansas. This lake, which no longer exists, was in the Kansas River Valley, about ten miles upstream from the mouth of the Big Blue River. Other, more recent records from the Kansas River Basin, in the vicinity of the Big Blue River, are: Maple Leaf Lake, Riley Co., Oct. 4, 1925; Deep Creek, Riley Co., no date; Wildcat Creek, Riley Co., Sept. 7, 1923; and Wildcat Creek, Riley Co., Sept. 29, 1925 (UMMZ 122187-90). Most of the collections were made by Minna E. Jewell (Nelson, personal communication). =Moxostoma aureolum= (LeSueur), northern redhorse: Cragin (1885:108) as _Moxostoma macrolepidotum_ LeSueur; Meek (1895:136) as _Moxostoma macrolepidotum duquesnei_ (LeSueur); Evermann and Cox (1896:394-395); and Jennings (1942:364) as _Moxostoma erythrurum_ (Rafinesque). Stations 41-S, 43-S, 44-S, and 53-S. I collected three northern redhorse from the Big Blue River Basin, and another specimen was seined in the mouth of Mill Creek, Riley County (my present Station 9-G) by the Kansas State College class in fisheries management in 1954 (KSC 5068). I reidentify as _M. aureolum_ the two specimens recorded by Jennings (_loc. cit._) as _M. erythrurum_. The subspecific status of _M. aureolum_ in the Kansas River Basin is to be the subject of another paper. =Catostomus commersonnii= (Lacepede), white sucker: Canfield and Wiebe (1931:8) as "common suckers"; and Breukelman (1940:380). Stations 7-G, 11-G, 12-G, 13-G, 16-G, 18-G, 19-G, 23-G, 29-G, 31-G, 53-S, 57-M, and 58-G. The white sucker occurred primarily in upland streams of the Flint Hills, with one occurrence in muddy habitat, and one in the main stream of the Big Blue River. Young _C. commersonnii_ were often taken in riffles, but adults were in the larger, deeper pools. The ages and total lengths at the last annulus for 12 white suckers were: I, 2.8 (4); II, 3.9 (6); III, 8.2 (1); and IV, 9.2 (1). =Cyprinus carpio= Linnaeus, carp: Canfield and Wiebe (1931:5-8, 10) as "carp." Stations 1-S, 2-S, 3-S, 4-S, 6-S, 7-G, 8-S, 15-S, 16-G, 18-G, 23-G, 24-G, 25-S, 27-G, 30-M, 35-M, 38-S, 41-S, 42-S, 43-S, 44-S, 45-M, 52-S, 53-S, and 56-S. Carp occurred throughout the basin. The habitat of this species closely approximated that of the river carpsucker; however, carp were more often taken in moderate to swift water than were _C. c. carpio_. The ages and average lengths at the last annulus for 40 carp from the Big Blue River Basin were: I, 2.3 (4); II, 4.7 (10); III, 7.0 (10); IV, 9.0 (3); V, 11.3 (4); VI, 18.6 (1); VII, 18.9 (3); VIII, no fish; IX, 20.6 (3); X, 19.1 (2); XI, 21.1 (1); XII, 22.0 (1); and XIII, 24.1 (2). =Carassius auratus= (Linnaeus), goldfish. Station 4-S. I saw goldfish seined from Station 4-S by anglers obtaining bait on April 20, 1957. Goldfish were commonly used for bait at Stations 4-S and 54-S.