Ice fishing is the practice of fishing with lines and or spears through an opening in the ice on a frozen body of water. Ice Fisherman may fish in the open or in heated enclosures, some with bunks and amenities.
In North America, ice fishing is often a social activity. Some resorts have fish houses that are rented out by the day; often, shuttle service by Snow Track or other vehicles modified to drive on ice is provided. In North America, portable houses appear to create a city at locations where fishing is done.
Three main types of fishing occur. The first is using a small, light fishing rod with small, brightly coloured Fishing lures or Jigging with bait such as wax worms, fat heads or crappie or shiner . The angler sits at the hole in the ice and lifts the pole every now and then, producing the jig effect.
The second is using tip-ups, which are made of wood or plastic, and have a spool of line attached, with a thin piece of metal that goes from the spool to the flag. Black line is put on the spool and a swivel is placed at the end of the black line. Then a piece of fishing line with a hook is attached to the swivel. Worms, power bait, grub worms or small minnows are placed on the hook. The hook with bait is placed into the water under the ice. The depth that the bait is placed goes according to several theories. One theory is the bait is placed one meter under the ice. The second is that the bait is placed two to three metres under the ice. The third is that the bait is suspended one foot (30 cm) above the bottom of the lake. When the fish strikes the bait the flag is lifted which notifies the angler that a fish is on the hook. The angler pulls the line in and the fish fights. The angler will allow the line to slip through their hands during the struggle. Finally, when the angler can get the fish's head into the hole in the ice, the fish is quickly lifted onto the ice. This allows for less-intensive fishing.
The third method is Spearfishing fishing. A large hole is cut in the ice and may be deployed. The angler sits in a dark ice shanty called a dark house. The angler then peers into the water while holding a large spear which has four or five points. A line can be attached to the points. The fisher waits for fish to appear, then plunges the spear into the water. This method is often used for lake sturgeon fishing. In the United States many states allow only rough fish to be taken while spear fishing.
Becoming increasingly popular is the use of a flasher, similar to its summer cousin the fishfinder. This is a sonar system that provides depth information, as well as indicating the presence of fish or other objects. These flashers, unlike most typical fishfinders, display the movement of fish and other objects almost instantaneously. The bait being used can often be seen as a mark on the flasher, enabling the angler to position the bait right in front of the fish. Underwater cameras are also now available which allow the user to view the fish and observe their reaction to the lure presentation.
Clubbing is an old method seldom used today, mainly used on burbot, the fisher walks on clear ice in shallow water and sees a large fish through the ice and with a large club which they slam into the ice, the shockwave hits the fish and it is temporary paralyzed, which gives the fisher time to cut a hole in the ice to collect the fish.
Anglers can now use many available maps and surveys to help pinpoint lakes and areas within those lakes that make sense to try for specific fish, noting those locations in latitude and longitude coordinates. They are then able to use a handheld GPS receiver to aim them to those spots, usually with accuracy of less than 20 feet. Ice anglers then drill holes with whichever auger they have, checking the ice thickness for safety as they go. Most ice fishers advise checking that the ice is at least 4 inches thick. Using sonar, the angler can determine the depth of the water, bottom content, weed and structure cover, and even see if there are fish there. Also, by using sonar, they can place the bait according to where they think the fish are. If they are using "tip-ups" they can carpet the area at different depths and with different presentations (the number allowed being determined by local laws) and see what is the most productive. Modern ice anglers can also use modern reels mounted on shorter (18"-36"/45–90 cm long) fishing rods to actively fish by watching, by using their sonar, where their lure is relative to the fish, and jig accordingly to entice a bite.
Ice fishing can be done at any time of day, and is typically most active around dusk and dawn. Different fish are active at different times of day, so anglers need to fish for them accordingly. There are fish houses large enough and comfortable enough to spend many days in a row out on the lake, fishing the entire time. One can even fish in one's sleep, by using audible alarms on one's lines to tell when a fish is biting. There are also many lightweight and highly mobile portable shelters that mount on plastic sleds and collapse for transportation. These can vary from small, one-person shelters (commonly called "Fish Traps") to large and complex shelters able to fit up to 20 people at once.
Late-winter warm spells can destroy the texture of the ice, which, while still of the required thickness, will not adequately support weight. It is called "rotten ice" or soft ice and is exceedingly dangerous. Some ice anglers will continue to fish, since even with the bad ice normally 8 inches (20 cm) is more than enough. Ice anglers may carry a self-rescue device called an ″ice pick″ made of two spiked handles connected by a string to pull themselves out of the water and onto the ice.
Other risks associated with ice fishing include carbon monoxide poisoning from fish house heaters and frostbite due to prolonged exposure to wind and low temperatures, although most new houses are fitted with air exchange systems that allow air flow, preventing poisoning.
Although fatalities are somewhat rare, in the year of 2017, 56 people died while out on the ice in USA and Canada. Fatalities almost always occur from drowning after one has fallen into the ice, although a small number of victims died from blunt-force trauma ( e.g.: hitting one's head on the ice whilst falling in the water).
Currently, the world's largest contest, the Brainerd Jaycees Ice Fishing Extravaganza, is held on Gull Lake, north of Brainerd, Minnesota, in January of each year. The contest has over 15,000 anglers and drills over 20,000 holes for the contest. $152,232 in charity was raised in the 2016 contest, and donated to 41 local charities.
Lake Simcoe in Canada has abundant cold water fish such as lake trout, herring and whitefish. It is sometimes known as Canada's ice fishing capital, and every year it is host to a very large and well-organized contest.
In Hwacheon, South Korea, a large ice fishing festival is held every January. The Ice Festival draws nearly a million visitors every year, and thousands of people have taken part in a contest to catch fish in a frozen Hwacheoncheon (a tributary of the Han River).
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