FAMILY CATOSTOMIDAE 



125 



Lake fishery of the Minnesota State Fisheries the production of this 

 species alone was 30,016 pounds for the period ending January 1, 1919. 



RIVER SUCKER (Lake Carp, Carpsucker) 

 Carpiodes f orbed Hubbs 



The adult river sucker is similar in body form and color to C. carpio. 

 It differs in the position of the nostrils, which are considerably posterior 

 to the tip of the lips. The lips are plicate and not very thin; the halves 

 of the lower lip meet in a rather wide angle. The anterior rays of the 

 dorsal fin are slightly elevated and are scarcely more than half the 

 length of the base of the fin. The dorsal fin has from 25 to 30 rays, 

 usually 27 or 28. The lateral line has 38-40 scales. 



Diagram 6. Diflferences in the head structures of the four species of Carpiodes. 



(A) Carpiodes cypiinus. (B) Carpiodes forbesi. (C) Carpiodes carpio. 



(D) Carpiodes velifer. 



