63 



10 MIN. CONTROL 



64 



I 755 I 78" 



53 



42 



64 



10 MIN. -18,000 C.P.S. 



65 



m 



10 MIN.- CONTROL 



66 



Figure 19. Distribution of fish in pens, experiments 63-66. All experiments 

 started with 1,000 fish in pen No. 1 (far left). In controls, Rates between 

 pens lifted for indicated period, then lowered. Tests same, except sounds of 

 indicated durations and frequencies (cycles per second) applied at indicated 

 location while gates up. Numbers and dark bars show distribution of fish 

 after gates lowered. 



23 



