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  • Canadian Shark Analysis Laboratory - Greenland Shark
  • Florida Museum of Natural History - Greenland shark

Greenland shark, (Somniosus microcephalus), person in the sleeper shark family Somniosidae (order Squaliformes, that also includes the dogfish household, Squalidae) that's the longest-living vertebrate known. The types is mainly based in the cold-water environments for the Arctic Ocean and North Atlantic, from Baffin Bay eastward into the Barents Sea, but its range additionally expands southward into the North Sea plus the waters next to the Eastern Seaboard of this united states of america. Bulky, with a curved snout, tiny fins in accordance with human anatomy size, and grey to brown coloration, Greenland sharks are comparable to spiny dogfish (Squalus acanthias)

except which they lack a back at the second dorsal fin and in most cases usually the one in the very very first fin that is dorsal.

Normal history

The Greenland shark is among the biggest fishes that are cartilaginous. It may achieve a size of 7 metres (23 legs) and a fat of 1,025 kg (2,260 pounds) whenever completely grown, but the majority are between 2 and 4 metres (6.5 and 13 foot). Minimal is well known, but, about how exactly the types reproduces. Females are believed to attain intimate readiness whenever they surpass the 4-metre (13-foot) mark in total, which does take approximately 150 years to obtain. They've been ovoviviparous (that is, eggs are retained inside the physical human anatomy until they hatch) and create on average 10 offspring at the same time. The sort, quantity, and extent of parental care the receive that is young unknown, but experts speculate that, like many shark types, Greenland sharks are separate from delivery. No other vertebrate known has an expected life provided that this species; radiocarbon relationship of isotopes in the shark’s eye-lens suggests that are nuclei the earliest Greenland sharks might be a lot more than 500 years of age.

Greenland sharks are hardly ever experienced by people. They have been considered to choose colder, much much much much much deeper surroundings but could be discovered ranging from the ocean area and depths of 2,200 meters (about 7,200 feet). Greenland sharks are slow-moving, typically swimming at rates of not as much as 3 kilometer (about 1.9 kilometers) each hour. They truly are carnivorous, and their diet is frequently consists of a number of different forms of fishes, including smaller sharks, eels, flounders, and sculpins. Crustaceans, seabirds, and carrion—as well as terrestrial animals (such as for example horses and reindeer) that probably dropped through the ice—have been present in belly analyses regarding the types. Greenland sharks aren't considered dangerous to people, to some extent since they reside in regions where individuals usually do not typically swim; truly the only known report of the feasible assault by a Greenland shark on a person dates to 1859.

Preservation status

Greenland sharks are thought to be always a near-threatened types by the Overseas Union for Conservation of Nature.

The types had been valued for the liver oil; about 114 litres (30 gallons) of liver oil can be acquired from a sizable specimen (see additionally fish oil). (even though flesh associated with Greenland shark could be consumed, it really is toxic unless correctly washed and dried out or over over and over over over over and over repeatedly boiled ahead of consumption.) Greenland sharks had been fished commercially through the century that is 19th 1960. Norway persecuted Greenland sharks through the 1970s, simply because they had been regarded as being a nuisance that threatened other fisheries. Into the 1900s that are early numerous as 30,000 Greenland sharks had been caught per year. In our day the yearly take is far smaller; small-scale subsistence fisheries in the Arctic harvest less than 100 people yearly, and approximately 1,200 are caught inadvertently in fishing trawls.

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