mature male goblin sharks have been found to reach lengths ranching from 8.66 to 12.6 feet (2.6 to 3.8 meters) long. mature females have been found to reach lengths ranging from 11 to 12.2 feet (3.4 to 3.7 meters). the size at birth is not known, but the smallest specimen found was 3.51 feet (1.07 meters) long. the heaviest goblin shark found weighed 210 kg (460 pounds), and was 3.8 metres (12 feet) long.