(CNN) -- Thousands of dead fish and other marine life have been found at the mouth of the Mississippi River outlet into the Gulf of Mexico, according to the president of St. Bernard Parish in Louisiana.
"I'm talking about 5,000 to 15,000 dead fish," Craig Taffaro said of the Sunday discovery. Dead species included crabs, sting rays and a variety of fish.
According to Taffaro, there is some "recoverable oil" in the area but there also have been "oxygen issues," so officials don't know yet if the fish kill is related to the BP oil spill. Officials from the Louisiana Wildlife and Fisheries Department are investigating.
Taffaro said the discovery underscores the need "to continue to monitor our waters."