13 



5 MIN. CONTROL 



►a 



5 MIN -70 C.P.S. 



>l 



5 MIN -70 TO 700 C.P.S. (ONE SEC. INTERVALS) 



5 MIN. -80 C.P.S. 



'J. 



5 MIN. -90 C.RS. 



5 MIN.- 100 C.RS. 



Figure 10. Distribution of fish In pens, experiments 13-18. Each experiment 

 started with 1,000 fish in pen Ko. 1 (far left). In control, gates between 

 pens were lifted for Indicated period, then lowered. In tests, procedure was 

 the same, except that sounds of indicated frequencies (cycles per second) and 

 durations were applied at indicated location while gates up. Dark bars show 

 number of fish after gates lowered. 



12 



