Figure 14.--Distribution of fish in pens, experiments 37-42. Experiments 37, 38, 42 started with 1,000 fish in 

 pen No. 1 (far left); 39, 40 with 500 fish each in pens 5 and 6 (from left) and 41 with 1,000 in pen No. 10 (far 

 right). In controls, gates between pens lifted for indicated period, then lowered. Procedure same in tests, 

 except sounds of indicated duration and frequency (cycles per second) applied at indicated location while 

 gates up. Numbers and dark bars indicate distribution of fish after gates lowered. 



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