United States Department of the Interior 

 Oscar L« Chapman, Secretary 

 Fish and Wildlife Service 

 Albert M. Day, Director 



Special Scientific Report - Fisheries 

 No. 29 



INJURED AND DEAD FISH 

 IN THE VICINITT OF BONNEVILLE DAM 



By 



Harry A. Hanson, formerly Aquatic Biologist, Fish and 

 Wildlife Service, Paul D« Zimmer, Fishery Research 

 Biologist, Fish and Wildlife Service, and Ivan J. 

 Donaldson, Biologist, Corps of Engineers, U. S. Army 



CONTENTS 



Page 



Introduction •• ••• •..••....• 1 



Section !••• • 2 



Injured Fish Studies. .• 2 



Injuries observed at Bonneville Dam 2 



Injuries, 1943 2 



Net injuries, Chinook Salmon, 1946 2 



Injuries observed above and below Bonneville Dam ... 2 



Big White Salmon Hatchery 3 



Bonneville Hatchery. ................. 4 



Observations of fish passing through submerged 



openings in Bonneville fish ladder ...• 7 



Section II ...'12 



Adult fish mortality studies - 1946 -12 



Float experiment ••••• 12 



Observations of dead fish. 16 



Dead fish below Bonneville 16 



Dead fish above Bonneville ........••.••. 19 



Dead fish used by sturgeon fishermen 22 



SusTvoiary. •...'.22 



Conclusions ........24 



Appendix 



Table 1, River flow in cubic feet per second -Bonneville 

 Dam August 1 - September 15, 1946 • ' 25 



