and because of these characteristics they resemble 

 the eastern carpsucker, often to a remarkable degree. 

 On the other hand individuals from turbid waters con- 

 taining little food, and others heavily parasitized, 

 grow slowly, are terete and large-eyed and resemble 

 Carpiodes forbesi , a form inhabiting turbid streams 

 west of the Mississippi River." (Trautman, 1957:237) 



The latest List of Common and Scientific Names of Fishes (American 

 Fisheries Society, 1970) does not list subspecies of C. cyprinus , and 

 _C. forbesi has been synonymized with C. cyprinus . There is a consider- 

 able range of variation in morphology of quillback taken in the Illinois 

 River electrof ishing survey, and some of the variation is undoubtedly 

 due to factors such as nutrition, mentioned by Trautman. 



The greatest number of quillback carpsuckers ( Carpiodes cyprinus ) 

 was usually taken in three pools of the Illinois River: Marseilles, 

 Starved Rock, and Peoria, so the quillbacks apparently preferred the up- 

 stream portions of the Illinois River more so than did their close rela- 

 tive, the river carpsucker (Table 14) . 



Highfin carpsucker (Carpiodes verlif er) . Two highfin carpsuckers 

 were taken in Starved Rock Pool in 1960 and one from the same pool in 

 1965. Highfin carpsuckers may have comprised a portion of the Carpiodes 

 spp. group mentioned above. 

 Smallmouth buffalo (Ictiobus bubalus) 



Like the bigmouth buffalo, the smallmouth buffalo was most common 

 in the collections from Peoria and LaGrange Pools (Table 15) . An un- 

 usually large number of smallmouth buffalo were taken from Starved Rock 

 Pool in 1974. The smallmouth buffalo is a commercial species. 

 Bigmouth buffalo (Ictiobus cyprinellus) 



The largest numbers of bigmouth buffalo were taken in Peoria and 

 LaGrange Pools (Table 16) . No bigmouth buffalo had ever been taken 

 from Dresden Pool by electrof ishing and none had been taken from 

 Marseilles Pool prior to 1974. Bigmouth buffalo had been taken in 

 Starved Rock Pool in only one year, 1966. In 1974, they were taken in 

 both Starved Rock and Marseilles Pools. It is surprising that few in- 

 dividuals of the three species of buffalo were ever taken in Alton Pool 



28 



