United States Department of the Interior, Douglas McKay, Secretary 

 Fish and Wildlife Service, John L. Farley, Director 



STUDIES ON AN 

 ICHTHYOSPORIDIUM INFECTION IN FISH: 

 TRANSMISSION AND HOST SPECIFICITY 



By 



Paul V. Gustafson 



Department of Microbiology 



University of Washington 



and 



Robert R. Rucker 

 Fishery Research Biologist 

 Fish and Wildlife Service 



Special Scientific Report- -Fisheries No. 166 



Washington, D. C. 

 January 1956 



