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OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY 



Figure 6. — Timing of migration of spring chinook salmon (age-groups O and I) frooi Eagle Creek to 

 Brownlee Reservoir in relation to water temijerature and flow, 1962-65 (x indicates i>eriods of no 

 data). 



catch — were taken each spring. These fish averaged 

 140 mm. (126-180 mm.) and were scattered 

 tliroughout the migration. 



Most hsli moved downstream past the louver at 

 night — between 6 and 12 p.m. Few fish were 

 caught through the rest of the 24:-hour period ex- 

 cept during higli flows and turbid water; at these 

 times fish moved downstream throughout the day 

 and night. 



Kokanee 



Kokanee sahnon from tlie Payette River system 

 appeared at the Snake River sampling site in 

 mid-June in 1963-65. The migration was evident 

 for 3 or 4 weeks, but most of the fish moved down- 

 stream during a 1-week period (fig. 7). Kokanee 

 averaged 118 to 120 mm. long through the 1964 

 migration and 93 to 108 mm. through the 1965 

 season (table 5). 



JUVENILE SALMON AND TROUT MIGRATION INTO BROWNLBE RESERVOIR 



209 



