SUMMARY 



1. Total Rock Islcind Dam count of salmon 

 and steelhead in 1965 was 85,107, about 30,000 

 less than in 1964. 



2. The Chinook count of 36,407 (jacks in- 

 cluded) was 3,544 less than in 1964, more than 

 two-thirds the peak year of 1 957, and exceeded 

 the 32-yr. average by about 18,300 fish. In 

 1 965, 17,113 jacks were recorded, representing 

 about 47 percent of the total chinook counted. 

 In 1964, jacks represented about 36 percent of 

 the Chinook run. 



3. The sockeye count of 42,379 ixi 1965 was 

 less than the 1964 count by 27,032 fish and was 

 less than the 32-yr. average of 52,159. 



4. The coho count of 258 in 1965 was more 

 than three times greater than the 32-yr. aver- 

 age of 80 fish and was about 35 percent of the 

 peak year 1962 when 737 were counted. 



5. The steelhead count of 6,063 in 1965 was 

 1,047 more than the 1964 count of 5,016 and 

 2,557 more than the 32-yr. average of 3,506. 



6. In 1965, as in previous years, a greater 

 percentage of salmon and steelhead used the 



left bank fish ladder than either of the other 

 ladders, 



7. Counting began May 1 and ended October 

 15. From May 1 through August 31, fish were 

 counted 16 hr. each day; from September 1 

 through October 15, counting was reduced to 

 14 hr. each day, 6 a.m. to 8 p.m. to conform 

 to the hours of available daylight. 



8. In 1965, maximum number of salmonids 

 counted in 1 day (3,340) occurred on July 16, 

 as compared to 6,866 on July 27, 1964. 



9. Season's total fish other than salmonand 

 steelhead passing Rock Island Dann in 1965 

 was 115,045, composed of the following: 

 sucker, 71,662; squawfish, 28,317, whitefish, 

 4,961; chub, 4,982; carp, 444; lamprey, 4,475; 

 Dolly Varden and rainbow trout, 204. 



10. Of the 85,107 salmon and steelhead 

 examined, on the top and one side only as they 

 passed over the counting boards, about 4.5 

 percent had injuries of some type either on the 

 body or about the head. Most injuries were 

 observed in July and August, and were more 

 numerous among the larger chinook and sock- 

 eye. 



MS #1543 



24 



OU. S. GOVERNMENT PRINTING OFFICE : 1966 O - 231-270 



