When I lived in San Diego, I did a whole lot of tuna fishing. Those things would follow us out of the harbor for 100 miles. You would hook up a tuna and if one of those nasty things grabbed your tuna, all you got was a head. The captains used to try to run em over. One of em would shoot at em. He never shot at em but close enought to try to move em away.
They are nasty nasty animals. They can take your leg off with one bite. **** all over the place too. Just Nasty I tell ya!