UNITED STATES DEPARTMENT OF THE INTERIOR, Douglas McKay, Secretary 

 FISH AND WILDLIFE SERVICE, John L. Farley, Director 



BIOTIC INFLUENCES AFFECTING 



POPULATION GROWTH OF 



PLANKTONIC ALGAE 



By Theodore R. Rice 



FISHERY BULLETIN 87 



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 25 cents 



