100: 



50 lOO 150 200 250 28i 



DISTANCE FROM MOUTH OF RIVER (KM.) 



Figure 19. — CPUE (catch per unit of effort) of bridgeUp, 

 largescale, and mountain sucker from the main stem of 

 the Yakima River in 1957 and 1958, by sampling site. 



into some tributary streams to spawn; 

 however, spawning migrations could not 

 be detected in the Yakima River. 



Mountain sucker (20) 



Small numbers of mountain sucker were 

 taken predominantly between km. 153 

 and 250 (fig. 19; table A- 19). 



Largescale sucker X bridgelip sucker , 

 hybrid 



Individuals suspected to be of this par- 

 entage were collected at km. 32, 129, 

 and 169 (table A- 20). 



Black bullhead (22) 



Small numbers of black bullhead were 

 taken between km. and 105 (fig. 20, 

 table A-21), usually in areas with mud 

 bottom and low water velocity. 



Sand roller (23) 



Sand rollers were consistently taken be- 

 tween km. 145 and 161 (fig. 21, table 



50 100 ISO 200 250 



DISTANCE FROM MOUTH OF RIVER (KM.) 



281 



Figure 20.— CPUE {catch per unit of effort) of black bull- 

 head from the main stem of the Yakima River in 1957 

 and 1958, by sampling site. 



A-22), and a few were collected during 

 other studies in an irrigation canal 

 that returns to the Yakima River near 

 km. 217. 



Bluegill and pumpkinseed (combined, 17) 



Bluegill and pumpkinseed were found 

 below km. 217 in areas with low water 

 velocity and at km. 8 (fig. 22, table 

 A-23). 



Smallmouth bass (14) 



Normal range: Km. to 64 (fig. 23, 

 table A- 24). 



Largemouth bass (16) 



Normal range: Km. to 16, and 97 to 

 113 (fig. 23, table A-25). 



Black crappie (12 ) 



Normal range: Km. to 48 and 89 to 113 



(fig. 24, table A-26). 

 Periods of abundance: The greater 

 catches were made from January to 

 May 1958. 

 Comments: Black crappies were usually 

 found in schools in areas w^ith heavy 

 cover along the banks of the stream. 



Yellow perch (26) 



Yellow i>erch were taken at km, 89 and 

 to 16 (fig. 25, table A-27). 



Prickly sculpin (27) 



Prickly sculpins were taken between 

 km, 129 and 209 (fig. 26, table A-28). 



Mottled sculpin (11) 



Normal range: Knn. 16 1 to 281 (fig. 26, 

 table A- 29), 



Piute sculpin (13) 



Normal range: Km. 177 to 281 (fig. 26, 



table A- 30). 

 Periods of abundance: The greatest 



catches of Piute sculpins were made 



in November. 



Torrent sculpin (7) 



Normal range: Km. 145 to 281 (fig. 26, 

 table A- 31). 



14 



