FOREWORD 



Oceanic volume reverberation can adversely affect the performance of Navy sonars. Small swimbladder- 

 bearing fish are the primary cause of this reverberation at ship sonar frequencies. This report describes a new 

 acoustic model of a swimbladder-bearing fish. This model is an improvement over previous models and should be 

 of value in future volume reverberation studies. 



This report was originally a dissertation submitted in partial fulfillment of the requirements for the Ph.D. degree 

 in acoustics at the Catholic University of America. 



CHARLES G. DARRELL 

 Captain, USN 

 Commanding Officer 

 NORDA 



oustic scattering 

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and Dev. Activity 



RETURNED 



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