FISHES OF THE YELLOWSTONE NATIONAL PARK. 29 
12. RosystpE 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 
Sere SBE >, 
x 
RIK KM) 
Sp? 
x 
Fic. 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. Cuus (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 
i 
; 
) 
Wy 
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. 
