Doug Nelson, of Franklin, who caught the leaping shark on video on Saturday, told New England Cable News it "gave us a pretty good scare."
His son Jack can be seen on the video jumping back as the shark breaches the water's surface.
The Atlantic White Shark Conservancy confirmed it was a great white, as did Marc Costa, captain of the Orleans-based Columbia Sportfishing vessel.
Costa said the boat was about three miles west of Great Island in Wellfleet when the shark made its leap.
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