OCTOMITUS SALMONIS, A PARASITIC FLAGELLATE OF TROUT 
25 
8. While the parasites are ordinarily most abundant in fish less than one year 
old, small numbers are usually present in the older fish, which become carriers of the 
disease. 
9. It is believed that control of the disease must be based primarily on pro- 
phylactic measures. This can best be accomplished by keeping the fish under as 
favorable environmental conditions as possible. 
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