The three hybrids ore not included 



Figure 7. — Fish species taken from the main stem of the Yakima River in 1957 and 1958, by sampling site. 

 The presence of a species Is indicated by the horizontal bar. 



50 

 DISTANCE 



ISO 

 MOUTH 



200 250 281 



RIVER (KM.) 



Figure 8. — Average number of fish species taken from 

 each sampling site along the main stem of the Yakima 

 River, May 1957 to May 1958. 



sucker, chiselmouth, northern squawfish, red- 

 side shiner, longnose dace, and speckled dace. 

 The abundance of a species is shown in 

 tables 3 and 4. By family, the five most 

 abundant groups of fish by diminishing order 

 were Cyprinidae, Catostomidae, Salmonidae, 

 Cottidae, and Centrarchidae (figure 9). The 

 Cyprinidae and Catostomidae were most abun- 

 dant at km. to 72, 97 to 185, and 209 to 

 22 5. Salmonidae were relatively few in the 

 lower Yakima River but were generally co- 

 dominant with Cottidae above km. 177. Cen- 

 trarchidae were most abundant below km. 56. 



General . --Figure 7 shows the distribution of 

 each species. The largescale sucker and moun- 

 tain whitefish were the only species collected 

 at every station throughout the study area, 

 Anadromous chinook and coho salmon and 

 steelhead trout that were caught at km. 281 

 must have passed through the entire study 

 area. Species collected from at least 30 of 

 the 35 sampling sites include the bridgelip 



Seasonal .- -The seasonal distribution and 

 abundance of the species were as follows: 



Western brookand Pacific lampreys (com- 

 bined, 21^) 



Normal range: Km, 153 to 274 (fig. 10, 

 table A-1). 



"^ Number designates rank (1-29) in abundance among 

 fishes of the Yakima River. 



