452 
Fishery Bulletin 109(4) 
Figure 9 
(A) American shad ( Alosa sapidissima) counts at Bonn- 
eville Dam (black bars) and Oregon Production Index 
(OPI) coho salmon smolt-to-adult survival rates (SARs) 
(gray bars) along with (B) yearly average deviations 
of the Pacific Decadal Oscillation (PDO) index for the 
same years 
ment of Fish and Game), L. Allen (Southern California 
Marine Institute), and S. Ralston and B. MacFarlane 
(Southwest Fisheries Science Center) for information. 
W. Wakefield, R. Brodeur, M. Parsley, and anonymous 
reviewers provided helpful comments on the manuscript. 
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