One black crappie (KU 4174) was taken. Canfield and Wiebe (1931:10) noted: "The Black Crappie has been planted here [Big Blue River Basin in Nebraska] by the State, but, apparently, is not propagating itself." =Stizostedion canadense= (Smith), sauger. Station 56-S. Mr. Larry Stallbaumer, of Marysville, Kansas, obtained a sauger (KU 4179) while angling on May 25, 1958. =Stizostedion vitreum= (Mitchill), walleye. Though I failed to obtain the walleye in my survey, Dr. Raymond E. Johnson (personal communication) reported that the species occurred in the Nebraskan portion of the Big Blue River in recent years. Canfield and Wiebe (1931:6, 10) reported that "yellow pike are taken at Crete [Nebraska]," but may have referred to either the walleye or the sauger. =Perca flavescens= (Mitchill), yellow perch: Canfield and Wiebe (1931:5-6, 10) as "ring perch" and "yellow perch." This fish was not taken in my survey. Canfield and Wiebe (_loc. cit_.) reported that the yellow perch "had been planted by the State [Nebraska]." =Etheostoma nigrum nigrum= Rafinesque, johnny darter: Jennings (1942:365) as _Boleosoma nigrum nigrum_ (Rafinesque). Stations 10-G, 11-G, 12-G, 13-G, 16-G, 29-G, 40-M, 53-S, and 54-G. The larger pools of gravelly streams were preferred by johnny darters, but one specimen was taken from the main stream of the Big Blue River, and the species was abundant in one stream over hard, sand-silt bottom. =Etheostoma spectabile pulchellum= (Girard), orangethroat darter: Jennings (1942:365) as _Poecilichthys spectabilis pulchellus_ (Girard). Stations 5-G, 7-G, 10-G, 11-G, 12-G, 13-G, 16-G, 17-G, 18-G, 21-G, 23-G, 27-G, 28-G, 29-G, 33-M, 40-M, 49-M, 53-S, 54-G, and 59-G. The orangethroat darter was less restricted in habitat than the johnny darter, occurring in all stream-types, but most often in the riffles of gravelly streams. Most specimens from muddy or sandy streams were small. =Aplodinotus grunniens= Rafinesque, freshwater drum. Stations 3-S, 4-S, 6-S, 7-G, 8-S, 15-S, 38-S, 39-S, 53-S, and 56-S. The ages and calculated total lengths at the last annulus for 42 freshwater drum from the Big Blue River were: I, 3.0 (10); II, 5.7 (6); III, 9.4 (7); IV, 12.1 (13); V, 14.0 (3); VI, 15.1 (2); and VII, 16.3 (1). HYBRID COMBINATIONS I obtained two hybrid fishes in my study-area. One specimen of _Notropis cornutus frontalis_ x _Chrosomus erythrogaster_ was taken at Station 29-G. This combination was recorded by Trautman (1957:114) in Ohio. The other hybrid was _Lepomis cyanellus_ x _Lepomis humilis_, captured at Station 24-G. This combination was first recorded by Hubbs and Ortenburger (1929:42). Hubbs and Bailey (1952:144) recorded another hybrid combination from my area of study: _Campostoma anomalum plumbeum_ x _Chrosomus erythrogaster_, UMMZ 103132, from a "spring-fed creek on 'Doc' Wagner's farm, Riley County, Kansas; September 21, 1927; L. O. Nolf [collector]." RELATIVE ABUNDANCE AND DISCUSSION OF SPECIES