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. 



Figure 26.— Distribution of fish in pens, experiments 85-88. AH experiments started with 100 fish in each 

 pen. In controls, gates between pens lifted for indicated period, then lowered. Tests same, except sounds 

 under indicated operating conditions or at indicated frequencies (cycles per second) applied for indicated 

 time at indicated location. Numbers and dark bars show distribution of fish after gates lowered. 



25 



