I've seen parrotfish do this many times, and what comes out, of course, is sand. If you want to see what comes out when sharks do it, just check out this video here. When snorkeling or free-diving around anchored boats I always keep a close eye on any through-hulls I spy for exactly this reason.
  Marine biologists at the Woods Hole Oceanographic Institution have announced the discovery of a bizarre and extremely dangerous species of man-eating shark. Designated formally as Lamniforma Octopoda, the sharktopus, as it is referred to colloquially, has been cited in a number of lethal attacks on swimmers over the past month. Officials at WHOI have...



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