(2) a tagged fish from the 1956 fall tagging 

 experiments at Rock Island was observed with 

 this group at Tumwater. 



Dolly Varden and whitefish . — The few 

 Dolly Varden that were counted at Tumwater 

 were recorded from June to September. Most 

 of them passed during the month of July. 

 Whitefish were recorded from July to Sep- 

 tember with most passing in July. 



spawners dying represent a factor difficult 

 to evaluate regardless of the frequency of 

 the spawning surveys. However, these counts 

 are of value in determining the area within 

 the streams utilized for spawning and the 

 duration of spawning. In addition, the 

 counts are valuable when compared directly 

 with counts for other streams and in compar- 

 ing counts of the same stream from year to 

 year providing they are made in the same 

 manner. 



AREA AND TIME OF SPAWNING 



Salmon stresims of the Wenatchee River 

 system were surveyed from 1955 through 1957 

 to determine the distribution of the spawn- 

 ing populations. Spawning- ground fish 

 counts represent only a part of the total 

 escapement to a stream. The surveyor is 

 unable to see all the fish present in a 

 stream even under ideal conditions. New 

 spawners coming onto a riffle and old 



Live salmon were counted while the 

 observers either floated down the stream in 

 rubber boats or walked the stream bed. Un- 

 attended redds or fish nests were also 

 counted on the chinook spawning streams to 

 aid in pinpointing the peak of spawning. 

 On boat surveys usually one man counted the 

 fish and one man maneuvered the boat. Two 

 and sometimes three boats were used in sur- 

 veying the Wenatchee River, eill floating 

 parallel down the river. This enabled a 



1955 



1956 



1957 



e 15 22 



JANUARY 



5 12 19 26 2 9 16 23 30 7 14 21 28 4 II 18 25 2 9 16 23 30 6 13 2027 3 10 17 24 I 8 15 2229 5 12 19 26 3 10 17 24 31 

 MARCH APRIL MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER 



Figure 5. — Weekly totals of steelhead trout. Tumwater Dam, 1955-1957. 



