Young-of-the-year _L. osseus_, averaging 21.5 mm. in total length (range 13 to 30 mm.), were taken on June 14, 1957, and larger young (estimated 60 to 70 mm. total length) were taken on June 27, 1958. =Dorosoma cepedianum= (LeSueur), gizzard shad: Jennings (1942:364). Stations 1-S, 3-S, 4-S, 6-S, 8-S, 44-S, 45-M, and 53-S. Most gizzard shad were young-of-the-year, taken on July 16 and 17, 1957, at Stations 3-S and 4-S. Twenty specimens from Station 6-S that were in their second summer of life were from 3.8 to 5.9 inches total length at the last annulus (average 4.3). This species was usually found in quiet water and was most abundant near the mouth of the Big Blue River. =Hiodon alosoides= (Rafinesque), goldeye. Stations 3-S, 4-S, and 53-S. I caught five specimens of _H. alosoides_ from the Big Blue River, and another specimen, obtained by Dr. R. B. Moorman in 1954, is at Kansas State College (KSC 4984). One goldeye that I caught on April 20, 1956, prior to the beginning of my study, was a ripe female measuring 15.5 inches total length. The fish was beginning its seventh summer of life. =Cycleptus elongatus= LeSueur, blue sucker. The blue sucker is included on the basis of a single specimen (KSC 2917) collected by I. D. Graham and labeled "Blue River." No other data are with the specimen; however, most fishes deposited at Kansas State College by Graham are dated "1885" or "1886" and were caught near "Manhattan" (Riley County). =Ictiobus cyprinella= (Valenciennes), bigmouth buffalo. Stations 3-S, 6-S, and 30-M. Bigmouth buffalo were rare, and were taken only in quiet parts of larger streams, and in the borrow-pit at Station 6-S. =Ictiobus niger= (Rafinesque), black buffalo. Stations 3-S, 41-S, and 53-S. Only four individuals of _I. niger_ were taken. All were large adults (more than 20 inches in total length), and all were shocked in the deeper, swifter areas, where the channel narrowed. =Ictiobus bubalus= (Rafinesque), smallmouth buffalo. Stations 1-S, 3-S, 6-S, 7-G, 18-G, 38-S, 41-S, 43-S, 46-M, and 53-S. This species was found in relatively quiet waters in the main channel, in cut-off areas, and in creek-mouths. The ages and total lengths of 30 individuals obtained at Station 6-S were (average followed by number of fish in parentheses): I, 2.4 (11); II, 4.4 (14); and III, 6.6 (5). Canfield and Wiebe (1931:6-7, 10) recorded "buffalo-fish" and "buffalo" from the Big Blue Basin in Nebraska; however, no specific designation was given. =Carpiodes forbesi= Hubbs, plains carpsucker. Station 3-S.