Three more stranded spinner dolphins were rescued Monday north of Islamorada.
The Dolphin Plus Marine Mammal Responder team rescued the dolphins in Florida Bay at the Everglades National Park.
The dolphins were taken to Key Largo and examined by a marine mammal veterinarian. All three were found in grave condition.
Officials determined the three dolphins had to be euthanized.
Rescuers believe Hurricane Hermine might be the reason for several dolphins found stranded off the coast of the Florida Keys.
Five other dolphins were rescued Saturday. Only one remains alive and is is critical condition.