I have seen a photo in a fishing mag of a mako jumping clear out of the water (not great white), the ajoining article sait that it was estimated that at its size it had to be doing 65km/h for it to leave the water. There a doco on great whites that leave the water in pursuit of seals, but that is apparentely only seen at one location in the world. So it believable that sharks jump, but to line up a deckie on a trawler would be doubtful. Although stranger thing have happened.