53 



2 100 - 



1980 



1982 



1984 



1986 1988 

 Year of Spawning 



■1990 



1992 



1994 



Stray Fitness = 0.0 G Stray Fitness = 0.5 n Stray Fitness = 1.0 



1980 



1982 



1984 



1986 1988 

 Year of Spawning 



1990 



1992 



1994 



■ Stray Fitness = 0.0 Q Stray Fitness = 5 D Stray Fitness = 1.0 



Figure 14. Composition of the gene pool of the fall Chinook escapement past 

 Lower Granite Dam based on a simple dilution model with various 

 assumptions concerning fitness of strays. 



