United States Depeurtanent of the Interior, Fred A. Seaton, Secretary 

 Fleh and Wildlife Service, Amie J. Suomela, Commissioner 



SPAWNING ESCAPEMENT OF OKANOGAN RIVER 

 BLUEBACK SAIMON (ONCORHYNCHUS NERKA) , 1957 



by 



Donovan R. Crsuidock 

 Fishery Research Biologist 



Special Scientific Report--Fisheries No. 275 



Washington, D. C 

 December 1958 



