Table 4. —Catch per unit of effort-"- of fish from the main stem of the 

 YaMma River, by species and sampling date, 1957-58 



Common name 



Apr. 18- 

 June 20 



Ju:;/ 15- 

 Aug. 7 



Sept. 18- 

 Oct. 18 



Nov. 

 32-22 



Jan. 



1-21 



Mar. 

 3-20 



May 



12-20 



Total 



-Niimber- 



Percent- 

 age of 

 total 



Lamprey 12 



Salmon 72 



Mountain whitefish. . 154 



Cutthroat trout 



Rainbow trout 22 



Brown trout 



Brook trout 2 



Dolly varden 2 



Chiselmouth 612 



Carp 302 



Peamouth 2 



Northern squawfish. . 360 



Longnose dace 50 



Leopard dace 32 



Speckled dace 572 



Redside shiner 530 



Chiselmouth X 



northern squawfish 

 Redside shiner X 



speckled dace 



Bridge lip sucker. . . . 262 



Largescale sucker. . . 4-68 



Mountain sucker <4 



Largescale sucker X 

 Bridge lip sucker. . . . 



Black bullhead 12 



Sand roller 2 



Pumpkinseed and 



bluegill 16 



Smallmouth bass 48 



Largemou-th bass 26 



Black crappie 166 



Yellow perch 2 



Prickly sculpin 



Mottled sculpin 54 



Piute sculpin 22 



Torrent sculpin. .... 304 



Total 4, 110 



4 

 6 



4,596 



9,030 9,068 8,138 11,616 12,554 59,076 



20 

 4 



11 

 1 

 1 

 9 



12 



4 

 9 



-■• Catch per unit of effort is number of fish taken at a site di-vided by time of collection in 

 hundredths of hours. 



Periods of abundance: Lampreys -were 

 most abundant in the winter and least 

 abundant from March to June. 



Comments: Lampreys are apparently 

 residents of the upper Yakinna. The 

 Pacific lamprey undoubtedly passes 

 through the entire river in its anad- 

 romous migration. 



Coho and chinook salmon (combined, 10) 



Normal range: Km. 153 to 281 (fig. 11, 

 table A.2). 



Periods of abundance: Salmon -were most 

 abundant from March to May and less 

 numerous from June to October. 



Comments: The Yakima River system 

 has runs of coho, spring chinook, and 

 fall chinook salmon (Bryant and Park- 

 hurst, 1950; Fulton, 1968). 



The life history of coho and spring 

 chinook salnnon in the Yakima River 

 is similar. They spawn in the area 

 above km. 250. Their progeny emerge 

 from the gravel about March, and the 



1 

 1 

 1 

 3 



3 



1 

 5 



