34 



Adulc Fall Chinook Counted 

 Over Ice Harbor Dam and 

 Removed Cor Brood Stock 

 Year Counted Removed % Removed 



% Passage Brood 

 Allowed Stock 

 Past lower Adjust. 

 Dams Factor 



Adult Fall Chinook 



Natural Escapements 



Past Lower Granite Dam 



Unadjusted Adjusted 



1992 4,636 



1993 2,805 



1994 2,087. 



256': 



129^ 







100* 

 100% 

 100% 



1.00 

 1.00 

 1.00 



549 

 742 

 441 



549 

 742 



441 



^ Brood stock removal in 1976 took place at Little Goose Dam rather than Ice 

 Harbor Dam; 430 adults counted, 162 removed (38%) . 



2 Removal of fall Chinook for Lyons Ferry brood stock from 1991 through 1994 

 has been selective; only fish with missing adipose fins (coded wire tagged) 

 have been removed; and hence, there has been no effect on upstream passage 

 rate of "natural" fish spawning above Lower Granite Dam. 



Table 2. 



N'umber cf fall Chinook associated with the Saal^.'S ?.iver egg ba.-.!- 

 program from 1975-1983 and with the Lyons Ferry Hatchery from 1S34- 

 1994. •'■ 



NOTE: Since 1990, brood stock used at Lyons Ferry Hatchery have been screened 

 (CWTs examined) and those found not to be of Snake River origin have 

 been shipped to the Klickitat Hatchery in an effort to protect the 

 genetic integrity of the Lyons Ferry brood stock. The estimated portion 

 of Columbia River strays entering the Lyons Ferry brood stock was 4%, 

 18%, 39%, and 25% in 1987, 1988, 1989, and 1990, respectively (Waples et 

 al 1991). All juvenile progeny from adults spawned in 1989 were marked 

 prior to release amd returns from this year class are being prevented 

 from entering the brood stock in future years. Thus the entry of 

 Columbia River strays into the Lyons Ferry brood stock have been 

 effectively prevented from the 1989 brood year forward. 



^ Source: Waples et al (1991) and Mundy (1994) . 



^ Collected at Little Goose Dam (Waples et al 1991) . 



Source for 1994' data: Larrie LaVoy (personal communication). 



