Clubbing is an old method seldom used today, mainly used on , the fisherman walks on clear ice in shallow water and sees a large fish through the ice and with a large club which he or she slams into the ice, the shockwave hits the fish and it is temporary paralyzed, which gives the fisherman time to cut a hole in the ice to collect the fish.
Some anglers use stoves and heaters in their shanty to keep warm. Others use small burners outside on the ice to warm their hands or to keep them warm as they sit to fish. As always, use caution with any heater. Sometimes shanties can be left on a lake most of the winter and people group together in a "shanty town." Late in the season, portable shelters can be used but they must be removed daily. Be sure and check your current fishing regulations for ice shanty rules.