UNCLASSIFIED 
SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) 
REPORT DOCUMENTATION PAGE 
1. REPORT NUMBER 2. GOVT ACCESSION NO.) 3. RECIPIENT’S CATALOG NUMBER 
TP 76-20 
4. TITLE (and Subtitle) 5. TYPE OF REPORT & PERIOD COVERED 
LETHAL EFFECTS OF SUSPENDED SEDIMENTS ON 
ESTUARINE FISH 
Technical Paper 
6. PERFORMING ORG. REPORT NUMBER 
8. CONTRACT OR GRANT NUMBER(S, 
- AUTHOR(s) 
J.M. O'Connor 
D.A. Neumann 
J.A. Sherk, Jr. 
- PERFORMING ORGANIZATION NAME AND ADDRESS 
DACW72-71-C-0003 
10. PROGRAM ELEMENT, PROJECT, TASK 
AREA & WORK UNIT NUMBERS 
Natural Resources Institute 
University of Maryland 
e Park, Maryland 20742 
- CONTROLLING OFFICE NAME AND ADDRESS 
Department of the Army 
V04230 
12. REPORT DATE 
December 1976 
15. SECURITY CLASS. (of this report) 
UNCLASSIFIED 
15a, DECL ASSIFICATION/ DOWNGRADING 
SCHEDULE 
DISTRIBUTION STATEMENT (of this Report) 
Approved for public release; distribution unlimited. 
. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 
- SUPPLEMENTARY NOTES 
- KEY WORDS (Continue on reverse side if necessary and identify by block number) 
Estuarine fish Mineral solids 
Natural sediments Patuxent River, Maryland 
Lethal effects Suspended solids 
ABSTRACT (Continue on reverse side if necesaary and identify by block number) 
A 3-year laboratory study identified certain estuarine fish sensitive 
to the effects of particle size and concentration of (a) suspended mineral 
solids similar in size to sediments likely to be found in estuarine systems 
in concentrations typically found during flooding, dredging, and disposal 
of dredged material, and (b) natural sediments in identical experiments. 
Significant mortality of estuarine fish was demonstrated at these suspended 
mineral solid concentrations. Estuarine fish were classified, using static 
Continued 
DD , FORM 1473 EDITION OF T NOV 65 IS OBSOLETE 
Heat) UNCLASSIFIED 
ee 
SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) 
