to be a boundary for the distribution of lam- 

 prey, salmon, trout, and sculpin, all of which 

 were absent in summer collections at sampling 

 sites downstream of km. 145. Because the 

 dams do not prevent downstream movements, 

 these species ^vere probably blocked by high 



Table 5. — Catch per vmit of effort of fish 

 taken downstream (km. 0-14-5) and upstream 

 (km. 153-281) of the Sunnyside and Wapato 

 irrigation diversions, by species, 1957-58 



Species 



Downstream 



the 

 diversions 



Upstream 



the 

 diversions-'- 



CPUE 



CPUE 



Lamprey 18 146 



Salmon 108 2,076 



Mountain whitef ish. . 958 2, 124- 



Cutthroat trout 6 



Rainbow trout 22 268 



Brown trout ID 20 



Brook trout 20 



Dolly Varden 2 



Chiselmouth 9, 624 2, 058 



Carp 2,550 16 



Peamou-th 2 



Northern squawf ish. . 4,320 1,560 



Longnose dace 346 384 



Leopard dace 238 68 



Speckled dace 2,084 712 



Redside shiner 2,098 4,090 



Bridgelip sucker.... 1,060 954 



Largescale sucker... 3,136 1,890 



Mountain sucker 34 194 



Black bullhead 104 



Sand roller ID 44 



fumpkinseed-bluegill 562 12 



Small mouth bass 830 



Largemouth bass 692 6 



Black crappie 1, 642 



Yellow perch 28 



Prickly sculpin 6 16 



Mottled sculpin 8 1,802 



Piute sculpin 804 



Torrent sculpin 30 2,566 



Hybrids ( -varioxos) ... 24 W 



•"• Catches in, and near, small streams at 

 km. 217 and 250 were not similar to adjacent 

 sampling sites, and are excluded from this 

 table. 



water temperatures or died from the effects 

 of high tennperatures. 



The composition of species downstream 

 of the irrigation diversions differed greatly 

 from the composition immediately upstream 

 (table 5). Mosf^ chiselmouth, carp, northern 

 squawfish, speckled dace, leopard dace, black 

 bullhead, pumpkinseed, bluegill, smallmouth 

 bass, largemouth bass, black crappie, and 

 yellow perch were taken at stations down- 

 stream of the diversions; most lamprey, 

 salnnon, mountain whitefish, cutthroat trout, 

 rainbow trout, brown trout, brook trout, red- 

 side shiner, mountain sucker, sand roller, 

 prickly sculpin, mottled sculpin, Piute sculpin, 

 and torrent sculpin were taken upstream of the 

 diversions. The species upstream are usually 

 indicative in Washington of cold water--with 

 the possible exception of redside shiner--and 



Table 6. — Relative temperature (cold or warm) 

 and velocity ( low or high) or water from 

 which most fish of each species were col- 

 lected in the main stem of the Yakima River 

 in 1957 and 1958 



Species 



Water 

 temperature 



Water 



velocity 



Cold Warm Low High 



Lamprey X 



Salmon X 



Mountain whitefish. X 

 Cutthroat trout. ... X 



Rainbow trout X 



Brown trout X 



Brook trout X 



Chisel mouth 



Carp 



Northern squawfish. 



Longnose dace 



Leopard dace 



Speckled dace 



Redside shiner 



Bridgelip sucker. . . 

 Largescale sucker. . ' 

 Mountain sucker. ... X 



Black bullhead 



Sand roller X 



Pumpkinseed- blue- 



gill - 



Small mouth bass. ... 

 Largemouth bass. ... 



Black crappie 



Yellow perch 



Prickly sculpin. ... X 

 Mottled sculpin. ... X 



Piute sculpin X 



Torrent sculpin. ... X 



X 

 X 

 X 

 X 

 X 



'Two-thirds, or more, of the total CPUE of the species. 



16 



