Security Classification 
DOCUMENT CONTROL DATA - R&D 
(Security classification of title, body of abstract and indexing annotation must be entered when the overall report is classified) 
1. ORIGINATING ACTIVITY (Corporate author) 2a. REPORT SECURITY CLASSIFICATION 
Navy Electronics Laboratory U 
Califor 
3. REPORT TITLE 
Marine Biological Sound West of San Clemente Island 
4. DESCRIPTIVE NOTES (Type of report and inclusive dates) 
Research Report January 1964 to December 1964 
5. AUTHOR(S) (Last name, first name, initial) 
Thompson, P. O. 
6. REPORT DATE 7a. TOTAL NO. OF PAGES 76. NO. OF REFS 
24 May 1965 42 14 
8a. CONTRACT OR GRANT NO. 94. ORIGINATOR’S REPORT NUMBER(S) 
b. PRosEcTNO. SF OO] 03 16 
1290 
Task 8529 
9b. OTHER REPORT NO(S) (Any other numbers that may be assigned 
NEL Problem Eval 1 351 this report) 
10. AVAILABILITY/LIMITATION NOTICES 
Qualified Requesters May Obtain Copies of This Report From DDC 
11. SUPPLEMENTARY NOTES 12. SPONSORING MILITARY ACTIVITY 
Bureau of Ships 
Washington 
D.C. 20360 
13. ABSTRACT 
A survey was made of the biological sound present in a set of tape 
recordings obtained from a hydrophone at 60 fathoms and another 
at 450 fathoms, over an 8-day period. A variety of types of 
biological sound were distinguished and analyzed. They were 
shown to have significant influence on the ambient noise level. 
DD ioe 1473 0101-807-6800 U 
Security Classification 
