150 NORTHERN FISHES 



GENUS Nocojjiis Girard 



HORNYHEAD CHUB (Jerker) 

 Nocomis biguttatus (Kirtland) 



The hornyhead chub (Figure 24F) is a large species, sometimes reach- 

 ing a length of 10 inches. It is one of the best Uve-bait minnows for bass, 

 pickerel, and other game fishes. The head is large and broad. Barbels are 

 present at the end of the maxillary. The scales are 6-41-4, with 18 rows 

 before the dorsal fin. A black spot is at the base of the caudal fin. The 

 pharyngeal teeth are 1, 4 — 4, 1, or 1, 4 — 4, 0, or rarely 4 — 4. 



The hornyhead chub ranges from North Dakota and Colorado east- 

 ward to the Hudson River drainage and southward to Oklahoma and 

 the Ohio Valley. It is widely distributed in Minnesota, and is common 

 in the Mississippi and Minnesota rivers and their tributaries and also 

 in Red Lake River and Pelican Lake, Crow Wing County (Cox, 1897) . 

 It is common in small tributaries of the St. Croix River in Pine County 

 (Surber, 1920) , It builds its nest in fine gravel (Hubbs and Cooper, 

 1936) . 



GENUS Hybopsis Agassiz 



SILVER CHUB (Storer's Chub) 

 Hybopsis storerianus (Kirtland) 



The silver chub is an elongated minnow with a short, broad back. The 

 back is greenish and the sides silvery. There is sometimes a faint lateral 

 band on the sides. The scales are 5-42-4 with 14 to 16 rows in front 

 of the dorsal fin. The pharyngeal teeth are 1, 4 — 4. 0. Barbels are 

 present. This fish reaches a length of over 8 inches. 



The silver chub ranges from the Red River drainage in Canada to the 

 southern shore of Lake Ontario and southward to northern Alabama, 

 Oklahoma, and Wyoming. This species is very common in the Minne- 

 sota and Lower Mississippi drainages. It has been reported from the 

 Ottertail River at Breckenridge and the Red Lake River at Crook- 

 ston, Minnesota, both in the Red River drainage (Cox, 1897) , and from 

 the Mississippi at Lake Pepin (Wagner, 1908) . Greene (1935) reported 

 this species from Lake Pepin southward. It prefers large muddy rivers. 



GENUS ExtfLwiiis Jordan 



SPECKLED DACE (Long Minnow) 



Extrarius aestivalis hyostomus (Gilbert) 



The speckled dace is a very slender minnow with a long snout project- 

 ing halfway beyond the mouth. It has a barbel on each maxillary and 



