28 FISHES OF THE YELLOWSTONE NATIONAL PARK. 



15. SILVERSIDE MINNOW (Leuciscus hydro phlox). 



This little fish is too small to be of much use for other than food 

 or bait for trout, attaining a length of only 3 to 5 inches. It occurs 



FIG. 15. Silverside minno\v. 



in some of the Snake River sources in the park, particularly Heart 

 Lake and Witch Creek. It spawns in the spring. 



16. LONGNOSE DACE (Rliinichthys dulcis). 



This little fish, attaining a maximum length of only about 5 

 inches, is food for trout and useful as bait. It is found in Heart 



TIG. ir. Lonenose <'a 



Lake and Witch Creek and also in Gardiner River below Osprey, 

 Undine, and Rustic Falls. 



17. DUSKY DACE (Agosia uubila). 



The little dusky dace, seldom over 3J inches in length, is extremely 

 abundant and widelv distributed in the Columbia River Basin. In 



FIG. 17. Dusky dace, 



the park it has been recorded from Heart Lake and Witch Creek. 

 It is useful as food for larger fishes and as bait for trout. 



o 



