Shark hunters find 420m-year-old 'extinct' four-legged fossil fish alive in ocean Their re-emergence is partly because of fishermen using gillnets on shark-hunting expeditions. and are able to reach where the fish which gather beneath the surface of the ocean. Updated Shark hunters have found a 420m year-old 'extinct' four-legged fossil fish alive in ocean The Daily Star's FREE newsletter is spectacular! Sign up today for the best stories straight to your inboxInvalid EmailSomething went wrong, please try again later. Sign up today! When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice.