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The burbot (Lota lota) or bubbot is the only gadiform (cod-like) freshwater fish. Also known as mariah, the lawyer, and (misleadingly) eelpout, the burbot is closely related to the marine common ling and the cusk. It is the only member of the genus Lota.
The name burbot comes from the Latin word barba, meaning beard, referring to its single chin whisker, or barbel. The genus and species name "lota" comes from the old French lotte fish named also "barbot" in this language. The Inuktitut–Iñupiaq word for burbot was also used to name the recently discovered extinct transitional species Tiktaalik.
With an appearance like a cross between a catfish and an eel, the burbot has a serpent-like body, but it is easily distinguished by a single barbel on the chin. The body is elongated and laterally compressed, with a flattened head and single tube-like projection for each nostril. The mouth is wide, with both upper and lower jaws consisting of many small teeth. Burbot have two soft dorsal fins; he first being low and short, the second being much longer. The anal fin is low and almost as long as the dorsal fin. The caudal fin is rounded, the pectoral fins are fan-shaped, and pelvic fins are narrow with an elongated second fin ray. Having such small fins relative to body size indicates a benthic lifestyle with low swimming endurance, unable to withstand strong currents. The circular or cycloid scales are very small, making it difficult to accurately age, and thus even more challenging to manage.
Burbot have circumpolar distribution above 40°N. Populations are continuous from the British Isles eastward across Europe and Asia to the Bering Strait. On the North American side, burbot range eastward from the Seward Peninsula in Alaska to New Brunswick along the Atlantic coast. Burbot are most common in streams and lakes of North America and Europe. They are fairly common in Lake Erie, but are also found in the other Great Lakes. Recent genetic analysis suggests the geographic pattern of burbot may indicate multiple species or subspecies, making this single taxon somewhat misleading.
In Britain, the burbot is possibly an extinct fish, as no catches of the species have been documented since the 1970s.  If the burbot does still survive in the UK, the counties of Cambridgeshire and Yorkshire (particularly the River Derwent or River Ouse) seem to be the strongest candidates for areas in which the species might yet survive. Plans to reintroduce this freshwater member of the cod family back into British waters have been made, but these have yet to occur.
Burbot live in large, cold rivers, lakes, and reservoirs, primarily preferring freshwater habitats, but able to thrive in brackish environments for spawning. During the summer, they are typically found in the colder water below the thermocline. In Lake Superior, burbot can live at depths below 300 m (980 ft). As benthic fish, they tolerate an array of substrate types, including mud, sand, rubble, boulder, silt, and gravel, for feeding. Adults construct extensive burrows in the substrate for shelter during the day. Burbot are active crepuscular hunters. Burbot populations are adfluvial during the winter months, and they migrate to near-shore reefs and shoals to spawn, preferring spawning grounds of sand or gravel.
Burbot reach sexual maturity between four and seven years of age. Spawning season typically occurs between December and March, often under ice at extremely low temperatures ranging between 1 and 4°C. Though a relatively short season lasting from two to three weeks, burbot will spawn multiple times, but not every year.
As broadcast spawners, burbot do not have an explicit nesting site, but rather release eggs and sperm into the water column to drift and settle. When spawning, many male burbot will gather around one or two females, forming a spawning ball. Writhing in the open water, males and females will simultaneous release sperm and eggs. Depending on water temperatures, the incubation period of the eggs lasts from 30 to 128 days. Fertilized eggs will then drift until they settle into cracks and voids in the substrate.
Depending on body size, female burbot fecundity ranges from 63,000 to 3,478,000 eggs for each batch. Rate of growth, longevity, and age of sexual maturity of burbot are strongly correlated of with water temperature: large, older individuals produce more eggs than small, younger individuals. Eggs are round with a large oil globule, approximately 1 mm (0.039 in) in diameter and have an optimal incubation range between 1 and 7°C (34 and 45°F).
Newly hatched burbot larvae are pelagic, passively drifting in the open water. Habitats about 12°C (54°F) are known to be intolerable for larval burbot. By night, juveniles are active, taking shelter during the day under rocks and other debris. Growing rapidly in their first year, burbot reach between 11 and 12 cm (4.3 and 4.7 in) in total length by late fall. During the second year of life, burbot on average will grow another 10 centimetres (3.9 in).
Burbot transition from pelagic habitats to benthic environments as they reach adulthood, around five years old. Average length of burbot by maturity is about 40 cm (16 in), with slight sexual dimorphism. Maximum length ranges between 30 and 120 cm (12 and 47 in), and weight ranges from 1 to 12 kg (2.2 to 26.5 lb).
At the larval stage, month-old burbot begin exogenous feeding, consuming food through the mouth and digesting in the intestines. Burbot at the larval stage and into the juvenile stage feed on invertebrates based on size. Under 1 cm, burbot eat copepods and cladocerans, and above 1 and 2 cm, zooplankton and amphipods. As adults, they are primarily piscivores, preying on lamprey, whitefish, grayling, young northern pike, suckers, stickleback, trout, and perch. At times, burbot will also eat insects and other macroinvertebrates, and have been known to eat frogs, snakes, and birds. Having such a wide diet is also correlated to their tendency to bite lures, making them very easy to catch. Burbot are preyed upon by northern pike, muskellunge, and some lamprey species.
The burbot is edible. In Finland, its roe is sold as caviar.An annual spearfishing tournament is held near Roblin, Manitoba. One of the highlights of the tournament is the fish-fry, where the day's catch is served up deep-fried. When cooked, burbot meat tastes very similar to American lobster, leading to the burbot's nickname of "poor man's lobster".
In the 1920s, Minnesota druggist Theodore "Ted" H. Rowell and his father, Joseph Rowell, a commercial fisherman on Lake of the Woods, were using the burbot as feed for the foxes on Joe’s blue-fox farm. They discovered the burbot contained something that improved the quality of the foxes’ furs; this was confirmed by the fur buyers, who commented that these furs were superior to other furs they were seeing. Ted Rowell felt it was something in the burbot, so he extracted some oil and sent it away to be assayed. The result of the assay was that the liver of the burbot has three to four times the potency in vitamin D, and four to 10 times in vitamin A, than “good grades” of cod-liver oil. Their vitamin content varies from lake to lake, where their diets may have some variation. Additionally, liver makes up about 10% of the fish's total body weight, and its liver is six times the size of those of freshwater fish of comparable size. The oil is lower in viscosity, and more rapidly digested and assimilated than most other fish liver oils. Rowell went on to found the Burbot Liver Products Company, which later became Rowell Laboratories, Inc., of Baudette, Minnesota, and is today a subsidiary of Solvay Pharmaceuticals of Brussels, Belgium.
Evelyn C. Smith researched and developed of the use of livers from the freshwater burbot for fish oil strong in vitamin A and D. She started during the Great Depression (1929) by offering free burbot oil to the poor and grew to commercializing the oil until the sale of the production equipment to the Rowell Fish Company in 1940.
The burbot is a tenacious predator, which will sometimes attack other fish of almost the same size, and as such, can be a nuisance fish in waters where it is not native. Recent discoveries of burbot in the Green River at Flaming Gorge Reservoir in Utah have concerned wildlife biologists, who fear the burbot could decimate the sport fish population in what is recognized as one of the world's top brown trout fisheries, because it often feeds on the eggs of other fish in the lake like sockeye salmon. The Utah Division of Fish and Game has instituted a "no release" "catch and kill" regulation for the burbot in Utah waterways.
The town of Walker, Minnesota, holds an International Eelpout Festival every winter on Leech Lake. The festival received national attention on March 4, 2011, when a correspondent from The Tonight Show with Jay Leno did a segment on the event.
Burbot populations are difficult to study, due to their deep habitats and reproduction under ice. Although burbot global distribution is widespread and abundant, many populations have been threatened or extirpated. Lacking popularity in commercial fishing, many regions do not even consider management plans. Pollution and habitat change, such as river damming, appear to be the primary causes for riverine burbot population declines, while pollution and the adverse effects of invasive species have the greatest influence on lacustrine populations. Management of burbot is on low priority, being nonexistent in some regions.