The Greenland Shark Essay Research Paper Sharks

The Greenland Shark Essay, Research Paper

Sharks live in almost every part of the oceans, from coastal environments to deep-sea habitats. They also live in the warm waters of the tropics to the cold frigid waters of

the polar region. The Greenland shark, also known as ?somniousus Microcephalus,? lives in the dark, cold waters of the North Atlantic (I 65). The Greenland shark belongs to the order Squaliforms, more usually known as dogfish sharks. There are 70 species in this order, which includes the spied sharks, spiny dogfish, Sleeper sharks and lantern fish (I 50).

Greenland Shark Classification:

Kingdom: Anamalia

Phylum: Cordates (possessing a notochord)

Sub Phylum: Vertebrates (possessing a back bone)

Super Class: Gnathostomata (jawed vertebrates)

Class: Chondrichthyes (cartilaginous skeleton)

Subclass: Elasmobranchas (ribbon like gills)

Super Order: Selachii or Selachimopha (shark shaped)

Order: Sqauliforms

Family: Sqaulidea

Species: somniousus Microcephalus

(I 185)

The shark?s habitat largely depends on the water temperature this allows its

habitat that ranges from the Polar latitudes to the North Sea in the east and the St. Lawrence River in the West. The Greenland shark has also wonders south as far as the

waters off Cape Hatteras and has also been found in the Gulf of Maine. The shark usually lives in cool water ranging from 2-7deg Celsius (II 63). However the sharks has also been found in the waters in the Artic Circle. (I 65) Typically the Greenland sharks live at extreme depths. In the winter months the Greenland sharks can be found at the surface and at the edges of ice burgs and glaciers. The sharks will also enter fjords during these months. However in the warmer months of summer, the sharks dives back to depths and lives at an average depth of 100-400 fathoms and has been caught in water as deep as 600 fathoms (II 63). Depending on season and water temperature, the shark?s habitat moves.

The diet of a Greenland will eat almost anything that it will come across. With its

slow swimming body plan, it includes bottom living shellfish, but it also hunts seals,

porpoises and other small whales and sea birds at the surface in its diet (I 65). These sharks also eats many kinds of fish, such as capelin, char, herring, halibut, lumpfish and even salmon. There has even been fast swimming fish found with its tail bitten off inside the shark?s stomach (II 63). A bizarre delicacy for a Greenland shark is reindeer. Some sharks have been found with whole reindeer in their stomachs (IV 55). As you can see the Greenland shark has a wide-ranging diet, however there are no documented attacks on humans, however there are Eskimo legends of these sharks attacking people in kayaks.

Many sharks have developed streamline bodies for speed or flat bodies to rest on

he bottom. However the Green land sharks does not do either of these, so a rounded

flabby body fits them well. This adaptation is due to the high pressures of the deep. The

pressures on the body supports and contains it. The skin does not need to restrain body

parts, just holds them in. When a Green land shark is brought to the surface, it is extremely sluggish and flimsy in the low pressure (I 119). Generally these sharks are very large with 2 spineless dorsal fins equal in size. The upper teeth are long and pointed cusps with smooth edges and the bottom teeth are overlapped and usually larger. The Eskimos who hunt this shark use its extremely sharp teeth for knives and spears. The average size Greenland shark is between 11ft and 21 ft and weigh about 630lbs to 2,250lbs (II 62). The longest Greenland shark recorded is 24ft and weighed 1 ton (IV 55). The color of the shark may be brown, black or a purplish gray on its dorsal and ventral sides. On its sides, maybe violet and bands of scattered white and black spots (II 62).

For such large shark, Eskimos in the area of the Greenland shark have been fishing and using them for centuries. Some Eskimos are ashamed for fishing for them because they are such a good target. Eskimos in the area say that a single Eskimo can haul up a Greenland shark in a small kayak. They sometimes use a piece of wood for bait and pull it across the surface to entice a shark to attack it (IV 55). People mainly fish the Greenland shark for its liver oil and flesh used as food and dog food, however they also hunt it because they sometimes enters fjords in the autumn and tear apart the fishnets set up there. A person can get about 30 gallons of oil from one large Greenland shark. Not everyone who fishes for Greenlands from a kayak. Instead of wood, mainly salted seal blubber is set on hooks and lowered. Most sharks are caught between 160-220 fathoms. In the winter they can be attacked to the surface with lights. Once at the surface, the sharks are very sluggish and offer little resistance (II 63). During the early 1900s about 30,000 Greenland sharks were caught every year for their oil (III Vol 5 472). These sharks are still-hunted today for their oil and meat.

These sharks are very elusive and are extremely hard to study in the natural environment, in fact not until a few years ago, someone videotaped the first and last video of a Greenland shark in its natura

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