542 



MOSS, BOONYARATPALIN, AND SHELTON 



E. C. GASTON p, 

 STEAM PLANT--»^, 



Fig. 5 Plot of location of largemouth bass no. 8, Sept. 3 to 19, 

 1974. Dashed line connecting positions (O O) indicates contin- 

 uous tracking. 



was reversed. Within 1 hr she had passed through the thermal zone 

 again to a position 100 m downstream from the plant (position 8). 

 The next morning, Sept. 5, she was located a short distance further 

 downstream (position 9), and 4 to 5 hr later was located near the 

 point of release, where she apparently remained for the next 5 days 

 (position 10). On Sept. 10, the fish was located opposite the plant 

 (position 11), and the treinsmitted temperature indicated a water 

 temperature of 24.4°C. Movement past the plant was again recorded, 

 but she did not proceed as far upriver as previously observed before 

 returning (positions 12 and 13). The next morning the fish was ageiin 

 located opposite the plant (position 14). Subsequently, movement 

 was only slightly doviaistream along the east shore. Surface tempera- 

 tures averaged 30 to 32°C, and transmitted temperatures were 25 to 

 27°C. The fish was not located on Sept. 19. 



The movements of this fish indicate that passage was possible in 

 the period of maximum thermal development. The path of move- 

 ment and the estimated depths suggest that the fish avoided 



