Megamouth Shark Photos (Megachasma pelagios). Theses still images were taken by Mark Dell’Aquila, on October 22, 1990, a day after the shark was caught by a fisherman. Mark then measured the shark and tagged him with electronic transmitters and released. The shark was then followed by scientist Dr. Donald Nelson and crew for more than two days collecting electronic data that to this day, remains priceless to scientists. See the video about this Megamouth and his cousins by clicking here.