32 



34 



5 MIN.- 160 C.P.S. (INTERMITTENT) ONE SEC. INTERVALS 



5 MIN. CONTROL 



5 MIN.- 140 TO 200 C.P.S. (SIREN EFFECT) 



10 MIN. CONTROL 



23 



10 MIN.- 700 C.P.S. 



I 



36 



20 MIN. CONTROL 



36 



63 



48 



Figure 13. Distributicsi of fish in pens, experiments 31-36. All experiments 

 started with 1,000 fish in pen No. 1 (far left). In cwitrols, 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 locaticn while gates up. Numbers and dark bars indicate distri- 

 bution of fish after gates Iciwered. 



15 



