Table 6. — Catches of juvenile salmon and rainbow-steelhead 

 trout by scoop traps below Brownlee Dam, May 1, 1963 to 

 August 31, 1966 ' 



Date Chinook Coho Sockeye Kokanee Rainbow- 



(year and salmon salmon salmon salmon steelhead 



month) t™u' 



1963: 



May 



June 



July 



August 



September.. 



October 



November.. 



December.. 

 1964: 



January. 



Number 

 2 

 194 

 62 

 82 

 16 

 8 

 49 

 101 



Number Number Number Number 



13 

 1 

 1 

 1 



247 



February 273 



--  370 



885 



506 



621 



56 



114 



25 



7 



8 



2 



March - 



Aprtl 



May 



June 



July 



August 



September.. 



October 



November.. 

 December. - 

 1965: 



January 



February.. - 



March 



AprU 



May 



June 



July 



August 



256 



262 



124 



84 



3 



2 



11 



90 



2 



1 



14 

 11 



28 



114 



79 



76 



61 



32 



3 



4 



4 



3 



Total 8,864 



729 



10,384 



3,466 



1,480 



' Catches by scoop trap reported by Graben, 1964 (see teit lootnote 1). 



Fall Chinook Salmon 



An estimated 54,800 native fall chinook salmon 

 from the Snake River left the reservoir in 1963 as 

 age-group and in 1964 as age-group I (table 7). 

 Of these fish, 2,700 were captured by the Idaho 

 Power Company barrier net in the forebay of the 

 reservoir and transported below Oxbow Dam and 

 released. Total emigration of the 1963 year class 

 was about 15 percent of established immigration 

 to the reservoir (table 7) . 



Age-group-0 fish from the 1963 year class first 

 appeared in the scoop traps below the dam in 

 May 1963 (fig. 3); peak migration was in June. 

 Except for one period in 1963 (late September to 

 early October), some fish moved past the dam 

 throughout the summer and fall. About 75 percent 

 of age-group I fish in 1964 (1963 year class) left 

 the reservoir in late January; a second peak ap- 

 peared in early April. 



Spring Chinook Salmon 



Emigration of juvenile spring chinook salmon 

 of the 1963 year class was 5,900 fish or about 16 

 percent of the estimated immigration from the 

 Weiser River and Eagle Creek to the reservoir 

 (table 8). A small number from Eagle Creek began 



«/) 

 o 



z 

 < 



o 



X 



I 



8- 



6- 



4- 



ul 3- 



OD 



2 



Z 



I- 



1 



I 1 l-p-. - ^   I I I I r-jJ 1-'-^- 



V^u 



.rft,. 



MAY JUN. JUL. AUG. SEP. OCT. NOV. DEC. JAN. FEB. MAR.APR. MAY JUN. JUL, 

 1963 1964 



Figure 3. — Estimated emigration from Brownlee Reservoir of juvenile native fall chinook salmon (1963 

 year class), from the Snake River, May 1963 to August 1964. 



250 



U.S. FISH AND WILDLIFE SERVICE 



