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READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



t. REPORT NUMBER 



TP 77-3 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE fand SubHfleJ 



SUBLETHAL EFFECTS OF SUSPENDED SEDIMENTS ON 

 ESTUARINE FISH 



5. TYPE OF REPORT a PERIOD COVERED 



Technical Report 



6. PERFORMING ORG. REPORT NUMBER 



AUTHORfsJ 



J.M. O'Connor 

 D . A . Neumann 

 J. A. Sherk, Jr. 



8. CONTRACT OR GRANT NUMBERCs> 



DACW72-71-C-0003 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Natural Resources Institute 

 University of Maryland 

 College Park, Maryland 20742 



V04230 



II. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CERRE-CE) 



Kingman Building. Fort Belvoir. Virginia 22060 



12. REPORT DATE 



February 1977 



13. NUMBER OF PAGES 



90 



14. MONITORING AGENCY NAME a ADDRESSf// d/Horen( Irom Controlling Olllce) 



IS. SECURITY CLASS, fo/ this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT fo/ this Report) 



Approved for public release, distribution unlimited. 



17. DISTRIBUTION STATEMENT fo/ (he abstract entered In Block 20, II dltlerent Irom Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue c 



aary and identify by block number) 



Estuarine fish 

 Mineral solids 

 Natural sediments 



Patuxent River, Maryland 

 Sublethal effects 

 Suspended solids 



ABSTRACT (Continue on reverse aide If neceamary and Identity by block number) 



The objective of this study was to determine the effects, if any, of 

 sublethal concentrations of suspended materials on the fish in estuarine 

 systems. Experimental sediment suspensions reproduced the concentrations 

 frequently found during flooding and at dredging sites and dredged-material 

 disposal sites. The suspensions were of natural sediment, obtained from 

 the Patuxent River estuary, Maryland, or commercially available fuller's 

 earth. 

 (Continued) 



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