5 MIN. CONTROL 



89 



5 MIN.- 10.000 C.P.S. 



Figure 27.--Distribution of fish in pens, experiments 89 and 90. Both experiments started with 100 fish in each 

 pen. In control, gates between pens lifted for 5 minutes, then lowered. Test same, except sound of 10,000 

 cycles per second applied for 5 minutes at indicated location. Numbers and dark bars show distribution of 

 fish after gates lowered. 



26 



