Fifteen of the 406 dolphins that have washed ashore in the last 14 months had oil on their bodies, National Oceanic and Atmospheric Administration scientists said during a conference call with reporters.
The oil found on eight of those dolphins has been linked to the April 2010 BP oil spill in the Gulf of Mexico, scientists said.
"It is significant that even a year after the oil spill we are finding oil on the dolphins, the latest just two weeks ago," said Blair Mase, southeast marine mammal stranding coordinator for NOAA Fisheries.
Since mid-March, 87 dead sea turtles have also been found, although no visible traces of oil have been discovered on the carcasses, said Barbara Schroeder, NOAA Fisheries national sea turtle coordinator.
"But we do not have very much information about how oil products find their way into turtles," she added.
The Gulf is home to five species of sea turtles, all of which are considered at risk of extinction.
In February, NOAA declared "an unusual mortality event" after a spike in the number of dead dolphins washing up in Louisiana, Mississippi, Alabama and Florida.
There have been 153 deaths this year, 65 of them newly born or stillborn calves, NOAA officials said on Thursday. Read More
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