PREFACE 



This report is published to inform coastal engineers of the 

 ecological effects of coastal engineering activities. The results 

 of this 2-year study can serve as a guide in sampling Pismo clam 

 populations along the California coast; the density and distribution 

 of the clam in Monterey Bay, and knowledge of spawning times can aid 

 in project planning to avoid harming an important fishing resource. 

 The work was carried out under the coastal ecology research program 

 of the U.S. Army Coastal Engineering Research Center (CERC) . 



The report was prepared by Dr. James Nybakken and Mr. Mark 

 Stephenson, of Moss Landing Marine Laboratories, Moss Landing, 

 California, under CERC Contract No. DACW72-72-C-0016. 



Mr. R.M. Yancey, Chief, Ecology Branch, was the CERC contract 

 monitor for the report, under the general supervision of Mr. R.P. Savage, 

 Chief, Research Division. 



Comments on this publication are invited. 



Approved for publication in accordance with Public Law 166, 79th 

 Congress, approved 31 July 1945, as supplemented by Public Law 172, 

 88th Congress, approved 7 November 1963. 



JAMES L. TRA^^RS 



Colonel, Corps of Engineers 



Commander and Director 



