FISHES OF THE 'YELLOWSTONE NATIONAL PARK. 29 



12. ROSYSIDE SUCKER (Catostomus ardens). 



This sucker is abundant in the Snake River Basin above Shoshone 

 Falls. It is reported from Heart Lake and Witch Creek and is 

 said to ascend the latter into very warm water flowing from Heart 

 Lake Geyser Basin. Like the longnose sucker, it spawns in spring 



FIG. 12. Rosyside sucker. 



or early summer. It will also take a baited hook and is edible but 

 not as palatable as the other sucker. In Heart Lake and Witch 

 Creek the alimentary tract of this sucker is infested by parasitic 

 worms, which, although offensive to the eye, do not render the fish 

 harmful as food. Affected fish, however, are likely to be lean and 

 unpalatable. 



13. CHUB (Leuciscus lineatus). 



This chub, known in the books as Utah Lake chub, is one of the 

 most widely distributed of the genus and abounds in the Snake River 

 Basin above Shoshone Falls; also in Yellowstone Lake and other 

 places in the park. Chubs from cool water are not to be despised 



FIG. 13. Chub. 



in game and food qualities. The species reaches a length of 12 or 

 15 inches or more and is said to be destructive to the eggs and young 

 of trout. No worms have been found in its alimentary canal. It 

 spawns in spring and early summer. 



Dr. Jordan says: " Chubs ascend Witch Creek until they reach 

 water fairly to be called hot, and the sucker is not far behind," en- 

 during a temperature of 88 F. 



