UNITED STATES DEPARTMENT OF THE INTERIOR, Douglas McKay, Secretary 

 FISH AND WILDLIFE SERVICE, John L. Farley, Director 



POPULATION HETEROGENEITY 

 IN THE PACIFIC PILCHARD 



By Frances E. Felin 



FISHERY BULLETIN 86 

 From Fishery Bulletin of the Fish and Wildlife Service 



VOLUME 54 



UNITED STATES GOVERNMENT PRINTING OFFICE • WASHINGTON : 1954 



For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C. 



Price 30 cents 



