5 MIN- NO AIR / 150 LB. WATER 



AVERAGE 5 MINUTE CONTROL 



BELL TELEPHONE TRANSDUCER 



5 MIN.- CONTROL 



87 



5 MIN - 7,000 C.P.S. 



Fipira 26. Djstrlbutiai of fish In pens, experiments 85-88. All experiments 

 started with 100 fish in each pen. In controls, gates betweer pens lifted for 

 indicated period, then lowered. Tests same, except sounds under indicated 

 operatinp conditions or at indicated frequencies (cycles per second) applied 

 for indicated time at indicated location. Numbers and dark bars show distri- 

 bution of fish after gates lowered. 



30 



