Table 3. — Estimated length and numbers of kokanee that 

 entered Brownlee Reservoir, 1963-66 (from Krcma and 

 Raleigh, 1970) 



Kokanee populations that passed through 

 Brownlee Reservoir did not do well. The fish that 

 we observed did not leave their nursery area until 

 late spring. They arrived at Brownlee Reservoir 

 when the impoundment was filling or full, the 

 temperatures were rising, and spillway flow was 

 reduced. If they did not move through the reser- 

 voir, the harsh environment in late summer prob- 

 ably caused almost total mortality. Emigration 



estimates made by Sims (1970) suggested that 

 losses were large in 1964 and 1965. These fish ap- 

 parently were unable to survive through the sum- 

 mer — a few holdovere of the 1962 migration were 

 captured in 1963, but none were observed in later 

 years. 



DISTRIBUTION AND MOVEMENT OF 

 HATCHERY-REARED SALMON 



To bolster the dwindlmg numbers of native salm- 

 on and to observe the effect of the reservoir on 

 the passage of other salmon species, we placed 

 hatchery-reared fall chinook and coho salmon 

 juveniles in the Snake River about 120 km. above 

 the reservoir in 1964 and introduced hatchery- 

 reared sockeye and fall-chinook juvenile salmon 

 about 88 km. above the reservoir in 1965 (Krcma 

 and Raleigh, 1970). 



>■ 

 < 



O 



> 6 

 tc 

 iij 

 in 



iLl 



tE 4 



3 



5 2 



UJ 



S 8 



u. O ^ 



o > 6 



cr. 



z ^ 



if UJ . 



I- oc 4 



UJ > 



? o 



Q Q 2 



N=23 

 AVG. = 0.79 KM./ DAY 



N=34 

 AVG.: 0.56 KM. /DAY 



N= 15 

 AVG. = 1.35 KM. /DAY 



N = 60 

 AVG. = 2.65 KM. /DAY 



3-9 10-16 17-23 24-30 31-6 7-13 14-27 21-27 28-4 5-11 12-18 

 MARCH APRIL MAY 

 I*— PRESMOLTING SEAS0N-*|« SMOLTING SEASON *\ 



FlGUBE 15. — -Numbers of tagged juvenile chinook salmon holdovers recovered in Brownlee 

 Reservoir, March 3 to May 18, 1963, showing direction and rate of movement. 



JUVENILE SALMON DISTRIBUTION AND MOVEMENT IN BROWNLEE RESERVOIR 



237 



