Ice fishing is the practice of catching fish with lines and fish hooks or spears through an opening in the ice on a frozen body of water. Ice fishers may fish in the open or in heated enclosures, some with bunks and amenities. Ice fishing gear is highly specialized. An ice saw, ice auger or chisel is used to cut a circular or rectangular hole in the ice. The size of the hole depends on the type of fish sought, generally suggested is 8 inches (20 cm). Power augers are sometimes used. If these tools are not available, an axe may be used to chop the hole. A skimmer, a large metal spoon with holes in it, is used to remove new ice as it forms and to clear slush left from making the hole. During colder periods most ice anglers choose to carry a heater of some type. The heater is not only for warmth but also for keeping an angler's fishing hole from freezing. When temperatures fall to -20 °F (-29 °C) or colder it becomes very hard to keep a fishing hole open. (Source: Wikipedia.org, CC BY-SA)