5 MIN. CONTROL 



89 



5 MIN- 10,000 C.P.S. 



Figure 27. Distrlbuticai of fish In pens, experiments 89 and 90. Both experi- 

 ments started with ICO 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 locatlcn. Numbers and' dark bars 

 show distribution of fish after gates lowered. 



31 



