What is the slowest shark in the ocean?

The Greenland shark, also known as the gurry shark, grey shark, or Eqalussuaq, it's a large shark of the family Somniosidae, closely related to the Pacific and Southern sleeper sharks.

Greenland sharks are among the largest sharks in the world, comparable in size to great whites. They have been known to grow as long as 21 feet and as heavy as 2,100 pounds, though the typical Greenland shark weighs around 880 pounds and is about 18 to 15.7 feet.

Greenland shark meat can cause symptoms in humans similar to severe inebriation, and the neurotoxins in their flesh can even be incapacitating to sled dogs. This toxicity is due to trimethylamine oxide in the tissue of Greenland shark flesh, which helps the fish stabilise their enzymes and structural proteins against the debilitating effects of severe cold and high water pressure. Nonetheless, Greenland shark meat can be prepared in a fermentation process that removes the TMAO, resulting in a much-enjoyed national dish of Iceland. This dish, known as Hákarl or kæstur hákarl, is prepared by hanging the meat of the Greenland shark up for four to five months, thus removing the adverse effects of the neurotoxins.

Greenland sharks do not attack humans.There are some early Inuit legends that claim Greenland sharks have attacked numerous kayaks, but the reality is that there is not one documented case of such an encounter. Greenland sharks are large and strong enough to easily injure or kill a human if they feel threatened.