The Coast Guard and local agencies are searching for a person in the water near Empire.
Officials say the man's name is Mark Matherne of Slidell.
Coast Guard Sector New Orleans received a report at 1:30 p.m. of a sunken vessel approximately six miles southwest of Empire.
Assisting in the search are the Louisiana Department of Wildlife and Fisheries and the Plaquemines Parish Sheriff's Office.
Anyone with information is asked to call the Sector New Orleans command center at 504-365-2544.