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  • Wildscreen Arkive – Greenland shark
  • WebMD – Secretin
  • Gulf of Maine analysis Institute – Greenland shark
  • Animal Diversity Online – Greenland shark
  • 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 vertebrate that is longest-living. The types is mainly based in the cold-water environments for the Arctic Ocean and North Atlantic, from Baffin Bay eastward to your Barents Sea, but its range additionally runs southward to your North Sea as well as the waters right beside the Eastern Seaboard of this usa. Bulky, with a curved snout, little fins in accordance with human body size, and grey to brown coloration, Greenland sharks are comparable to spiny dogfish (Squalus acanthias)

except which they lack a spine at the second dorsal fin and in most cases the only regarding the very very very first fin that is dorsal.

Normal history

The Greenland shark is among the biggest fishes that are cartilaginous. It could 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 legs). Minimal is well known, nevertheless, exactly how 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 reach. They have been ovoviviparous (this is certainly, eggs are retained inside the human anatomy until they hatch) and create on average 10 offspring at the same time. The sort, quantity, and period of parental care the young receive are unknown, but experts speculate that, like other shark types, Greenland sharks are separate from delivery. No other vertebrate known has a expected life provided that this species; radiocarbon relationship of isotopes in the shark’s eye-lens nuclei implies that the earliest Greenland sharks might be a lot more than 500 years old.

Greenland sharks are hardly ever experienced by people. They’ve been considered to choose colder, much much deeper surroundings but might be discovered ranging from the ocean area and depths of 2,200 meters (about 7,200 foot). Greenland sharks are slow-moving, typically swimming at prices of lower than 3 kilometer (about 1.9 kilometers) each hour. They truly are carnivorous, and their diet is oftentimes consists of many different kinds 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 for the types. Greenland sharks aren’t considered dangerous to people, to some extent since they are now living in areas where individuals usually do not typically swim; truly the only known report of a feasible assault by a Greenland shark on a person dates to 1859.

Preservation status

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

The types ended up being valued for the liver oil; about 114 litres (30 gallons) of liver oil can be acquired from a big specimen (see additionally fish oil). (even though flesh regarding the Greenland shark could be consumed, it really is toxic unless correctly washed and dried out or over and over over and over over repeatedly boiled just before 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 a nuisance that threatened other fisheries. Into the 1900s that are early numerous as 30,000 Greenland sharks had been caught per year. The annual take is far smaller; small-scale subsistence fisheries in the Arctic harvest fewer than 100 individuals annually, and roughly 1,200 are caught accidentally in fishing trawls in the present day.

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