IMl llKAl.lll MANAGEMENT 



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FiGL RE 85. External lesions in trout infected u ith corynebacterial kidney disease. 

 (Courtesy National Fish Health Laboratory, Leetown, West Virginia.) 



recurred. All published accounts of treatment with sulfonamides report that 

 mortality from the infection recurred after treatment ceased. Sulfametha- 

 zine (registered by the Food and Drug Administration) fed at 2.0 grams 

 per 100 pounds of fish per day has been successfully used for prophylaxis 

 in Pacific salmon. To date, no sulfonamide-resistant strains of the kidney 

 disease bacterium have been reported. 



Figure 86. Smallmouth bass with severe external fungus infection. (Courtesy G. 

 L. Hoffman, Fish Farming Experimental Station, Stuttgart, Arkansas.) 



