z 

 o 



UJ 



0. 



X 



o 

 o 



o 



40 



30 



20 



10 







40 



30 



20 



10 







40 



30 



20 



10 

 



1962 



1963 



1964 



1963 



1964 



Trout Migration 

 Temperature "C. 

 Flow C.M.S. 



30 

 20 



10 



H 

 d 







.,« , — a— ^ 1 1 r 



1965 



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



UJ 



302H30 



30 

 20 

 10 

 





a: 

 20^ 



UJ 



10 '-H 



UJ 



o 



Ui 



> 

 < 



' - 10 - 10 



203 



10 o 



UJ 



0^ 



30 

 20 



FiouEE 9. — Timiag of migratioii of juvenile rainbow trout to Brownlee Reservoir from Eagle Greek in 

 relation to water temperature and flow, 1962-65 (x indicates period of no data). 



opportunity to study the migration of a nonin- 

 digenous species. These fish were obtained from a 

 hatchery in the lower Columbia River, trans- 

 ported 120 km. above the resen'oir, and released 

 from March 15 to 30 in wat«r that averaged 9.4° 

 C. They did not appear in the Snake River trap 

 until mid- April (fig. 11). The run peaked in mid- 

 May and ended in early June. 



The mean lengths of trap samples of coho 

 salmon increased throughout the migration. Mi- 

 grants averaged 112 mm. (71-140 mm.) early in 

 the season; by the end of the migration period 

 they averaged 131 mm. (110-166 mm.). 



Sockeye Salmon 



About 473,000 sockeye salmon fingerlings were 

 released in 1965 in the Snake River 88 km. above 



212 



U.S. FISH AND WILDLIFE SERVICE 



