5 MIN- 67 C.P.S. 



FOLLOWING TEST NO. 7 NUMEROUS EXPERIMENTAL SIGNALS 

 WERE TRIED; SIREN, INTERMITTENT AND STEADY, COVERING 

 THE RANGE 67 C.P.S. TO 3,000 C.P.S. NO REACTIONS 

 WERE INDICATED 



2 MIN.- 3,000 C.PS. 



174 129 74 39 7 6 2 87 7 525 



ALL FISH CHANGED TO PREVENT TRAINING 

 5 MIN.- 70 C.PS. 



I 



5 MIN. CONTROLS 



Iiai2 



NO MOVEMENT 



Figure 9. Distribution of fish in pens, experiments 7-12. Experiment No. 7 

 started with 100 fish in each pen, and sound wsis 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 nunber of fish in each pen after gates lowered. 



11 



