THERMAL ECOLOGY AND STRESS 



343 



HEATED EFFLUENT 



1 km 



Fig. 5 Map of Par Pond showing entry of thermal effluent. Shading 

 represents the area with elevated temperature; all other locations in 

 reservoir have ambient temperatures. Bass in thermal areas were 

 mostly taken within 1 km of the point of entry of thermal effluent. 

 Bass in ambient locations were mostly taken from sites marked 1,2, 

 and 3. 



disease. Rogers (1971) stated that Epistylis induces scale erosion, 

 permitting secondary infection by A. hydrophila, but Lorn (1973) 

 indicated that there was no evidence to suggest that Epistylis could 

 produce the histolytic enzymes required to cause scale erosion. In 

 our study of the problem, we found three lines of evidence to suggest 

 that A. hydrophila is the etiological agent for red-sore disease. 



First, examination by scanning electron microscopy (Fig. 7) of 

 the site of attachment by Epistylis to a lesion on the surface of a 

 largemouth bass {Microptems salmoides) does not suggest that the 



