Moore (1957:80) states that _C. velifer_ occurs in the clearer rivers and lakes of the Mississippi valley, westward to Nebraska and Oklahoma. The almost complete disappearance of this species from Kansas probably resulted from an increase in turbidity, of the rivers, accompanying settlement and cultivation of the land.
_Carpiodes carpio carpio_ (Rafinesque). KU 5, 12, 15; DM 1, 16, 21, 37. The river carpsucker occurred at stations scattered throughout the drainage, except in the smallest creeks. The largest numbers were found in the lower mainstream.
_Ictiobus cyprinella_ (Valenciennes). KU 10; UMMZ 2; DM 1. The big-mouth buffalo was taken only near the mouth of the river; black buffalo, _Ictiobus niger_ (Rafinesque) and smallmouth buffalo, _Ictiobus bubalus_ (Rafinesque), possibly also occur there but were not taken in our survey.
_Catostomus commersonnii commersonnii_ (Lacépède). KU 4, 8, 14; UMMZ 1, 5; DM 10, 11, 15, 16, 21, 23, 25, 26, 27, 29, 34, 42. The white sucker occurs primarily in upstream-habitats in the Wakarusa Basin.
_Moxostoma aureolum_ (LeSueur). KU 15; DM 1. The northern redhorse was taken only in downstream portions of the basin. Minckley and Cross (1960) regard specimens from the Wakarusa River as intergrades between _M. a. aureolum_ and _M. a. pisolabrum_.
_Cyprinus carpio_ Linnaeus. KU 9, 12, 15; DM 1, 2. The carp, though most abundant in downstream situations, probably occurs throughout the drainage and is a potential pest in all impoundments likely to be constructed in the basin.
_Notemigonus crysoleucas_ (Mitchill). KU 9; DM 9, 27, 33, 41. The golden shiner was found only in tributaries.
_Semotilus atromaculatus_ (Mitchill). KU 2, 3, 5, 6, 7, 8, 10, 12, 13, 14; UMMZ 4, 5; DM 3, 9, 10, 11, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 29, 30, 31, 32, 33. The creek chub was usually abundant in small upland tributaries.
_Hybopsis biguttata_ (Kirtland). KU 1, 3; UMMZ 4. The hornyhead chub seemingly was common in early collections but has not been found since 1924. The fish characteristically inhabits clear streams having gravel-bottom. Disappearance of the species from the Wakarusa may have resulted from increased siltation and intermittency of flow.
_Hybopsis storeriana_ (Kirtland). KU 10; UMMZ 3.