tagging them, and returning them to the river, them, and added them to the population of car- 

 we acquired carcasses from other sources, tagged casses already in the river. 



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z 



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 q: < 

 o Q 



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 _l o 

 _j a: 



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4 

 ZS 



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T r 



100 100 200 



i DOWNSTREAM I UPSTREAM 



DISTANCE FROM BONNEVILLE DAM (KILOMETERS) 



Figure 4. — Distribution of floaters observed in 8-km. sections of Co- 

 lumbia River between Longview, Wash., and McNary Dam (320 km.), 

 July 16 to September 17, 1954. 



CHINOOK SALMON MORTALITY IN COLUMBIA RIVER NEAR BONNEVILLE DAM 



469 



