ABSTRACT 



Violent epizootics among hatchery reared sockeye salmon finger Lings 

 ( Oncorhynchus nerka ) caused by a filterable agent have occurred. In 1954, 

 one source of this infectious, filterable agent was found to be adult sockeye 

 viscera used in the diet for the fingerlings. The results of observations on 

 an epizootic in 1958 indicate that the infection may be transmitted to finger- 

 lings from a water supply to which adult sockeye salmon have access. 



IV 



