6. At two temperatures favorable for 

 trout propagation, kidney disease produces 

 greater losses at the lower temperature. The 



mechanism presumably involves a diminished 

 host response. 



I- 



lOO-i 



25- 



3 

 O 



EASTERN STRAIN 



WESTERN STRAIN 



7°C 



/ 



/ 



/ 



i^o ' 260 



TIME IN DAYS 



;j 



300 



Figure 1: --Response at 7° C. and at 12.5° C. of eastern brook trout to repeated 

 subdermal inoculations of an easuem and of a western strain of the fish 

 kidney disease bacterium . 



