UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



Charles F. Luce, Under Secretary 



Stanley A. Cain, Assistant Secretary for Fish and Wildlife and Parks 



PISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



Bureau of Commercial Fisheries, Harold E. Crowther, Acting Director 



Response of Migrating Adult Salmonids to 



Vertical and Horizontal Rectangular 



Orifices at Two Depths 



By 



CLARK S. THOMPSON, WILLIAM SPENCER DAVIS, 

 and EMIL SLATICK 



United States Fish and Wildlife Service 

 Special Scientific Report- -Fisheries No. 547 



Washington, D.C. 

 June 1967 



