30 



U. S. BUREAU OF FISHERIES. 



14. 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. 14. Silverside minnow. 



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

 Heart Lake and Witch Creek. It spawns in spring. 



15. LONGNOSE DACE (RJiinichthys dulcis) . 



This little minnow, attaining a maximum length of only about 

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



FIG. 15. Longnose dace. 



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

 Undine, and Rustic Falls. 



16. DUSKY DACE (Agosia nubila). 



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

 abundant and widely distributed in the Columbia River Basin. In 



FIG. 16. 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. 



