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Burbot

life science Maturity 5-7 Next article →

The burbot, known scientifically as Lota lota, is a unique species of coldwater ray-finned fish.

Lota lota GLERL 1
Lota lota GLERL 1

It is the only member of the genus Lota. It also stands alone as the only freshwater species in the order Gadiformes. This order includes many well-known marine fish. The burbot is closely related to the common ling and the cusk. These relatives belong to the family Lotidae, which are called rocklings. Because of its special place in biology, the burbot is a subject of great interest to scientists.

Burbot (51239920460)
Burbot (51239920460)

Physically, the burbot has a very distinct appearance. It has an elongated, serpent-like body that is laterally compressed. This means the body is somewhat flattened from side to side. Its head is also flattened, and it has single, tube-like projections for nostrils. One of its most famous features is a single barbel on its chin. A barbel is a fleshy whisker. The name "burbot" actually comes from the Latin word barba, which means beard.

Burbot (Batchawana B) 1
Burbot (Batchawana B) 1

The fish has a wide mouth filled with many small teeth. It possesses two soft dorsal fins on its back. The first is short and low, while the second is much longer. Its small fins suggest a benthic lifestyle. This means the fish lives on or near the bottom of the water. Because its fins are small relative to its body, it has low swimming endurance. It cannot easily withstand strong water currents.

Burbot have a circumpolar distribution in the subarctic regions of the Northern Hemisphere.

RangemapofLotalota
RangemapofLotalota

Their populations are continuous from France across Europe and through Russian Asia to the Bering Strait. In North America, they range from the Seward Peninsula in Alaska to New Brunswick on the Atlantic Coast. They are common in the Great Lakes, including Lake Erie. Some populations are even anadromous, meaning they live in the brackish waters of the Baltic Sea. However, the species may be in trouble in some places. In the United Kingdom, the burbot is possibly extinct. The last recorded capture was a specimen found in July 1970 by Stephen Mackinder. Scientists are currently investigating plans to reintroduce the fish to British waters.

Life for a burbot is defined by extreme cold. They prefer large, cold rivers, lakes, and reservoirs. During the summer, they stay in deep, cold water below the thermocline. In Lake Superior, they can live at depths below 100 meters. Unlike most fish, burbot spawn in mid to late winter. This usually happens between December and March. They often breed under ice in water temperatures between 1 and 4 degrees Celsius. During this time, they form a spawning ball. This occurs when many males gather around one or two females. They release sperm and eggs into the water at the same time.

Burbot (51239920460)
Burbot (51239920460)

The eggs are round and contain a large oil globule. Depending on the temperature, it can take 30 to 128 days for the eggs to hatch. A single female can produce a massive amount of eggs. Her fecundity, or egg-producing capacity, ranges from 63,000 to 3,478,000 eggs per clutch.

Burbot are slow-growing and long-lived animals. Their growth and maturity are closely tied to water temperature. In Alaska, it takes about 5 to 7 years for a burbot to reach 18 inches in length. They typically reach sexual maturity between 4 and 7 years of age. It is not uncommon to find individual fish that are over 20 years old. Adults usually reach an average length of about 24 inches. However, maximum lengths can reach up to 40 inches. They can also grow quite heavy, with weights ranging from 10 to 35 pounds. As they grow, they transition from a pelagic life in open water to a benthic life on the bottom.

As predators, burbot have a very diverse diet. Larvae and juveniles eat small invertebrates like copepods and amphipods. Once they become adults, they are primarily piscivores, which means they eat other fish. They prey on lamprey, whitefish, grayling, and even young northern pike. They have even been known to eat frogs, snakes, and birds.

British fresh water fishes (Plate- Burbot) BHL6175102
British fresh water fishes (Plate- Burbot) BHL6175102

This wide diet makes them very effective hunters. However, it can also cause problems in new environments. In Utah, biologists worry that burbot could harm trout populations by eating their eggs. Because of this, some areas have strict regulations for catching them.

Humans have found many uses for the burbot throughout history. The meat is edible and tastes similar to American lobster. This has earned the fish the nickname "poor man's lobster."

Burbot Liver Products Company 1940
Burbot Liver Products Company 1940

In the 1920s, Theodore and Joseph Rowell discovered the nutritional value of the fish. They noticed that feeding burbot to foxes improved the quality of the furs. They found that burbot liver is incredibly rich in vitamins. It contains three to four times the vitamin D of cod-liver oil. It also has four to 10 times the vitamin A. The liver makes up about 10% of the fish's total body weight. This discovery led to the creation of Rowell Laboratories, Inc. Today, the burbot remains a significant part of many local cultures and economies.

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🖼️ Images & Media (6)
File:RangemapofLotalota.jpg
RangemapofLotalota.jpg
File:Burbot (51239920460).jpg
Burbot (51239920460).jpg
File:Lota lota GLERL 1.jpg
Lota lota GLERL 1.jpg
File:British fresh water fishes (Plate- Burbot) BHL6175102.jpg
British fresh water fishes (Plate-...
File:Burbot Liver Products Company 1940.jpg
Burbot Liver Products Company 1940.jpg
File:Burbot (Batchawana B) 1.JPG
Burbot (Batchawana B) 1.JPG
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