A fun way to eliminate hollow trees is to knock a small hole in the base, and build a fire in the bottom.
I'll keep that in mind for "next time". Would have worked pretty well in this situation. A group tried to take it down with ammo and given enough time along with the addition of an illegal automatic weapon they probably would have got the job done, but I think finances were depleted before results were obtained. They had some fun though.
Fire would have definitely reduced the amount of fish structure left.
