GRAND ISLE, La. -- U.S. Fish and Wildlife Service agent Tom MacKenzie takes photos of a marsh-washing demonstration in Bay Jimmy, north of Grand Isle, La., August 21, 2010. The marsh-washing device is designed to wash oil residue from the marsh back into the water, where absorbent boom has been placed to soak it up. U.S. Coast Guard photo by Petty Officer 3rd Class Cory J. Mendenhall.