Tiger shark Galeocerdo cuvier
Tiger sharks are named for the dark, vertical stripes found mainly on juveniles, and which fade with age. They roam tropical and sub-tropical waters worldwide, often close to the coast, but also in depths to 900 metres. Commonly growing to more three or four metres in length, the tiger shark is a solitary, agile, mostly night-time hunter of fish, seals, birds, smaller sharks, squid, turtles, sea snakes, and dolphins. They have excellent vision in low light and can detect electric fields and minute vibrations in the water. These adaptations allow the tiger shark to detect hidden prey. Tiger sharks are captured for their fins, flesh and liver and populations have declined where they have been heavily fished. Tiger sharks have been tagged at Ningaloo Reef, Western Australia, and Raine Island, Queensland, to study their movements.