352 



ESCH AND HAZEN 



1975 



1976 



SEASON 



Fig. 11 Mean seasonal surface temperatures (composite for reser- 

 voir) and infection percentages among bass. 



35 



30 — 



Q 



L^ 25 

 u 



LU 



yr 20 



u 15 



^10 



• , Thermal 

 O, Ambient 



F W SP S F W SP S 



1974 1975 1976 



SEASON 



W SP 

 1977 



Fig. 12 Seasonal changes in infection percentages of bass from 

 ambient and thermal locations. 



