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  • Wildscreen Arkive – Greenland shark
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  • 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 http://datingrating.net/pagan-dating includes the dogfish household, Squalidae) that’s the longest-living vertebrate known. The types is mainly based in the cold-water environments associated with the Arctic Ocean and North Atlantic, from Baffin Bay eastward towards the Barents Sea, but its range additionally expands southward to your North Sea in addition to waters right beside the Eastern Seaboard for the united states of america. Bulky, by having a curved snout, little 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 the only regarding the very very very first fin that is dorsal.

Normal history

The Greenland shark is among the biggest cartilaginous fishes. 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, nevertheless, 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 attain. These are generally ovoviviparous (this is certainly, eggs are retained inside the human body until they hatch) and create on average 10 offspring at the same time. The kind, 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 nuclei shows that the earliest Greenland sharks can be a lot more than 500 years of age.

Greenland sharks are hardly ever experienced by people. They’ve been considered to prefer 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 not as much as 3 kilometer (about 1.9 kilometers) each hour. They’re carnivorous, and their diet is generally comprised of many 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 for the types. Greenland sharks aren’t considered dangerous to people, to some extent simply because they reside in regions where individuals don’t typically swim; truly the only known report of the feasible assault by a Greenland shark for a person dates to 1859.

Preservation status

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

The types had been valued because of its liver oil; about 114 litres (30 gallons) of liver oil can be had from a big specimen (see additionally fish oil). (even though the flesh of this Greenland shark could be consumed, its toxic unless correctly washed and dried out or over over and over repeatedly boiled just before consumption.) Greenland sharks had been fished commercially through the nineteenth century until 1960. Norway persecuted Greenland sharks through the 1970s, simply because they were regarded as a nuisance that threatened other fisheries. Within the very early 1900s since 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 unintentionally in fishing trawls.

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