The regs book say not to lift a big fish by the gills, it damages the spine and seperates the ligaments which will eventually kill the fish. The reccomended way is to realease the fish in the hole if possible. But with a big fish in a small hole that is hard to do, especially with a lot of ice. I would say ease the fish to through the hole and lay it on the ice, then for handling purposes put one hand in the gill plate and one under the belly. There is also no need to gaff a pike unless your are going to keep it. Once you get a pikes head in the hole he isn't gonna go in reverse and get outta dodge.