CONTENTS 



Page 



Characteristics of sound and sound devices. . . . 



Equipment and nnethods 



"Water hammer" - Electromagnetic transducer. 



Piezo-electric crystal transducer 



"Wampus" - Underwater turbine 



Electromagnetic transducer. Bell (lK-2) 



Summary and conclusions 



Literature cited 



1 



2 



3 



6 



16 



28 



29 



30 



9. 

 10. 

 II. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27. 

 28. 



FIGURES 



Rainbow trout used in the Leetown sonic experiments 



Dry pond, trap structure completed, gates rigged and in place 



Pond half filled 



Gates being held up as during a sound or a control run 



Fish being counted out to check on their reaction to a sound frequency 



Audio speaker used to produce low frequency sound. (Here shown out of the water.) . . 

 Power amplifiers and signal generator usedto provide so\ind to the underwater speaker 



shown in figure 6 



Distribution of fish in pens, experiments 1-6 



Distribution of fish in pens, experiments 7-12 



Distribution of fish in pens, experiments 13-18 



Distribut 

 Distr ibut 

 Distribut 



on of fish in pens, experiments 19-24 

 on of fish in pens, experiments 25-30 

 on of fish in pens, experiments 31-36 



Distribution of fish in pens, experiments 37-42 



Distribut 



Distribut 



on of fish in pens, experiments 43-46 



on of fish in pens, experiments 47-50 



Distribution of fish in pens, experiments 51-56 



Distribution of fish in pens, experiments 57-62 



Distribution of fish in pens, experiments 63-66 



Effect of conditioning on experimental fish 



The "wampus" in operation 



The water pump and air compressor in position to operate the 



Distribution of fish in pens, experiments 67-72 



Distribution of fish in pens, experiments 73-78 



Distribution of fish in pens, experiments 79-84 



Distribution of fish in pens, experiments 85-88 



Distribution of fish in pens, experiments 89 and 90 



The Bell Telephone transducer, frequency 200 c.p.s. to 10,000 c.p.s 



wampus 



3 

 3 

 4 

 4 



5 

 5 



5 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 

 15 

 17 

 18 

 19 

 20 

 21 

 21 

 22 

 23 

 24 

 25 

 26 

 29 



