The tiger shark breeds by internal fertilization. It is the only species in its family (mammals) gives birth to live young. The young are nourished inside the mothers body for up to 14 to 16 months, where the female can produce a litter ranging from 10 to 80 young. A newborn tiger shark is generally 51 centimetres (20 in) to 76 centimetres (30 in) long[2] and leaves its mother upon birth. It is unknown how long tiger sharks live, but it has been speculated to be 20 years Although shark attacks on humans are a relatively rare phenomenon, the tiger shark is responsible for a large percentage of the fatal attacks that do occur on humans, and is regarded as one of the most dangerous species of sharks. Tiger sharks reside in temperate and tropical waters. They are often found in river estuaries and harbors, as well as shallow water close to shore, where they are bound to come into contact with humans. Because of their curious nature of feeding it is expected that a tiger shark would normally attack a human if it came in contact with it. Tiger sharks are known to dwell in waters with runoff, such as where a river enters the ocean. Tiger sharks have become a recurring problem in Hawaii and are considered the most dangerous shark species in Hawaiian waters. They are considered to be sacred `aumakua` or ancestor spirits by the native Hawaiians, however between 1959 and 1976, 4,668 tiger sharks were hunted down in an effort to control what was proving to be detrimental to the tourism industry. Despite these numbers, little decrease was ever detected in the attacks on humans. It is illegal to feed sharks in Hawaii and any interaction with them such as cage diving is discouraged. While the tiger shark is not directly commercially fished, it is caught for its fins, flesh, liver, which is a valuable source of vitamin A used in the production of vitamin oils, and distinct skin, as well as by big game fishers. Tiger shark`s fins are known as Sea Tiger Fins in Chinese cuisine. It is used for making shark fin soup and is very popular among the affluent in China