Ikiited States Department of the Interior, Fred A. Seaton, Secretary 

 Fish and Wildlife Service, Arnie J. Suomela, Commissioner 



PASSAGE OF SALMONOIDS THROUGH A DARKENED FISHWAY 



by 



Clifford W. Long 



Fishery Research Biologist 



Bureau of Commercial Fisheries 



United States Fish and Wildlife Service 

 Special Scientific Report — Fisheries No. 300 



Washington, D. C. 

 May 1959 



