A fish of the Megalopidae family. The Atlantic tarpon (Megalops atlanticus) inhabits coastal waters, estuaries, lagoons, and rivers. Tarpons feed almost exclusively on schooling fish and, occasionally, on crabs. Tarpons are capable of filling their swim bladder with air, like a primitive lung. This gives tarpons a predatory advantage when oxygen levels in the water are low. Tarpons have been recorded at up to 250 centimetres (98 in) in length and weighing up to 161 kilograms (350 lb). Atlantic tarpons are also known as the silver king.