A leatherback turtle has been freed after becoming caught in fishing nets off Rhode Island. The Mystic Aquarium said Monday that its marine animal rescue team and a Coast Guard crew had rescued the male turtle, which weighed between 600 and 700 pounds, on Thursday after it was spotted by a local fisherman 3 or 4 miles south of Charlestown. A statement from the aquarium said the turtle was badly entangled and would have died if rescuers had not intervened. Once freed, the turtle swam out to sea. Leatherbacks are the largest species of sea turtle alive today and are protected by the Endangered Species Act.