5 MIN.- 140 C.P.S. (INTERMITTENT) ONE SEC. INTERVALS 



►); 



i 



5 MIN. CONTROL 



26 



I 



5 MIN.- 70 TO 140 C.P.S. (SIREN EFFECT) 



>)? 



I 



5 MIN. CONTROL 



28 



I 



5 MIN.- 160 CP.S. 



>}: 



I 



5 MIN. CONTROL 



30 



I 



Figure 12. --Distribution offish in pens, experiments 25-30. All experiments started with 1,000 fish in pen No, 

 1 (far left). In controls, gates between pens lifted for indicated period, then lowered. Procedure same in 

 tests, except sounds of indicated duration and frequency (cycles per second) applied at indicated location 

 while gates up. Numbers and dark bars indicate distribution of fish after gates lowered. 



11 



