FOLLOWING TEST NO. 7 NUMEROUS EXPERIMENTAL SIGNALS 

 WERE TRIED; SIREN, INTERMITTENT AND STEADY, COVERING 

 THE RANGE 67 C.RS. TO 3,000 C.RS. NO REACTIONS 

 WERE INDICATED 



2 MIN.- 3.000 C.P.S. 



ALL FISH CHANGED TO PREVENT TRAINING 

 5 MIN.- 70 C.PS. 



I 



I 



5 MIN. CONTROLS 



iai2 



■9961 



I 



NO MOVEMENT 



Figure 9.- -Distribution of fish in pens, experiments 7-12. Experiment No. 7 started with 100 fish in each 

 pen, and sound was applied at indicated location and frequency (in cycles per second) while gates between 

 pens were open for indicated period. Experiments 8-12 were started with 1,000 fish in pen No. 10 (far 

 right). Procedure was as above, except that for tests sounds of indicated frequencies and durations were 

 applied at indicated locations while gates up. Numbers and dark bars indicate number of fish in each pen 

 after gates lowered. 



