CONTENTS 



Page 



Characteristics of sound and sound devices 1 



Equipment and methods. ...... 3 



"Water Hammer" - Electro-magnetic transducer 6 



Piezo-electric crystal transducer l8 



"Wampus" - Underwater turbine 20 



Electro-magnetic transducer. Bell (lK-2) 35 



Sumraary and Conclusions 35 



Literature cited 38 



ILLUSTRilTIONS 



Figure Page 



1. Rainbow trout used in the Leetovrn sonic experiments .... h 



2. Dry pond, trap structure completed, gates rigged and in 



place. . . ., 5 



3. Pond half filled 5 



h. Gates being held up as during a sound or a control run. . . 7 



5. Fish being counted out to check on their reaction to a 



sound frequency 7 



6. Audio speaker used to produce low frequency sound. (Here 



shown out of the water). . 8 



7. Povjer amplifiers and signal generator used to provide 



sound to the underwater speaker shown in figure 6 '8 



9, Distribution of fish in pens, experiments 1-6 10 



9. Distribution of fish in pens, experiments 7-12 11 



10. Distribution of fish in pens, exp'-=riments 13-18 ...... 12 



11. Distribution of fish in pens, experiments 19-2U 13 



12. Distribution of fish in pens, experiments 25-30 ih 



13. Distribution of fish in pens, experiments 31-36 ...... l5 



lii. Distribution of fish in pens, experiments 37-U2 ...... l6 



15. Distribution of fish in pens, experiments Ii3-Il6 17 



16. Distribution of fish in pens, experiments ii7-50 19 



17. Distribution of fish in pens, experiments 51-56 ...... 21 



18. Distribution of fish in pens, experiments 57-62 ,. 22 



19. Distribution of fish in pens, experiments 63-66 23 



20. Effect of conditioning on experimental fish 2li 



21. The "Wampus" in operation 26 



22. The water pump and air coraprcssor in position to operate 



the "Wampus" 26 



23. Distribution of fish in pens, experiments 67-72 27 



