Fipire 2U. Distribution of fish in pens, experiments 73-78. All experiaents 

 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 applied for indicated time at indicated location. Numbers 

 and dark bars show distribution of fish after gates lowered. 



28 



