5 MIN.- 400 CP.S. 



5 MIN. CONTROL 



44 



10 MIN.- 400 CP.S. 



10 MIN.- 500 CP.S. 



Figure 15. Distribution of fish in pens, experiments U3-U6. All experiments 

 started with 1,000 fish in pen No. 1 (far left). In control, gates 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 amd dark bars show distribution of fish 

 after gates lowered. 



17 



