the same date for both seasons and the 

 abundance of young salmon dropped to a very 

 low level prior to the time high waters 

 prevented trapping. 



A few blueback were caught during 

 October 1955; however, these fish followed 

 by a few days the release of hatchery 

 reared fish into Lake Wenatchee. More than 

 likely these were hatchery fish moving 

 downstream and do not represent a normal 

 migration for this species. 



Chinook salmon . — Young chinook salmon 

 were taken at Turawater Dam continuously 

 during the trapping season from early spring 

 until late fall. The daily abundance in 

 the spring of 1955, as measured by 7-12 p.m. 

 counts, is given in figure 13. The single 

 Ijirge peak occurred on May 2, the same day 

 as for the blueback. The graph indicates 

 periodic peaks of abundance occurring during 

 the migration in the spring season. This 

 may indicate a downstream movement in schools, 

 or possibly may be due to an accumulation of 

 fish in the forebay before they pass on 

 downstream. The pattern of abundance was 



19 21 23 25 27 29 I 3 5 7 9 II 13 15 17 19 

 4PRIL MAY 



Figure I3. --Spring 1955 downstream migra- 

 tion - Chinook salmon, Tuuiwater Dam. 

 Counts from 7 p.m. to 12 midnight. 



J^ 



n 



n 



t: 



I 



n 



r 



h 



^^ 



\\ 



{[ 



^ 



- "L 



~I5 20 25 30 5 io 15 20 25 50 5 io H 20 is 30 5 io i^ 20 25 30 5 io 15 20~ 



JULY AUGUST SEPTEMBER OCTOBER NOVEMBER 



Figure ll+. --Summer and fall downstream migration - chinook salmon, Turawater Dam. 

 Counts from 2k hour days. 



11 



