Sharks take a range of adaptations that brand them perfectly suited to their surroundings. It'due south no wonder they've gained a reputation for being some of the near impressive and formidable predators on the planet!

SKELETON

Shark skeletons are made of cartilage. This is potent and durable, yet much more flexible and lighter than bone. Being lighter helps a shark to stay adrift and reduces the corporeality of energy they need to move most. The flexibility of cartilage also allows them to make tight turns quickly. Making them 1 of the virtually agile animals in the ocean.

Scientists tin tell the historic period of a shark by counting the rings on their backbone!

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Pare

Shark pare is covered with millions of tiny teeth called dermal denticles. These point backwards, reducing surface drag and helping the shark swim faster. Equally a shark grows they shed their denticles, replacing them with larger ones.

The hydrodynamic efficiency of shark skin has been replicated by swimming costume manufacturers. It'due south said that their costumes assistance better pond times. In fact they were so effective that they were labelled 'applied science doping' and banned from Olympic competition.

Denticles vary in shape according to the species and where they are on the trunk. Some are so big that the shark uses them equally defensive spines or shields!

TEETH

Made of enamel, shark teeth are strong and appear in huge numbers in the fossil record.

Sharks fend for themselves immediately after nascency, then they're built-in fully equipped. They have many rows of teeth which are constantly existence replaced. Ensuring they always accept a full fix of razor-precipitous pearly-white gnashers.

Sharks replace their teeth approximately every 2 weeks. Some species tin can lose 30,000 teeth in their lifetime!

We can tell what a shark eats by the shape of its teeth. Apartment crushing teeth are perfect for eating shellfish. Pointed teeth for gripping fish. And sharp serrated teeth for larger prey, such as seals.

A shark's teeth may change with historic period as the nutrition of a pup may differ to that of an adult.

FINS

Fins provide residue and stability in the water. Sharks have a large dorsal fin which provides balance. Unremarkably they'll likewise have a smaller dorsal fin farther back towards their tail. Their pectoral fins are used to steer and elevator themselves in the water. And their tails are used to propel themselves frontwards.

The size and shape of a shark's fins and tail can vary greatly.

Faster sharks (such as the Shortfin Mako) tend to accept shorter crescent shaped tails. Whereas slower moving sharks (such every bit the Bluntnose Sixgill Shark) have longer thinner tails.

Sadly, high need for shark fins has contributed to the decline of many shark species. Detect out more by visiting our Stop Shark Finning Campaign.

GILLS

To breathe many shark species have to remain in constant forrard movement. As they swim h2o is driven through their mouth and out over their gills. A process known as 'ram-ventilation'. As water passes over the gills, oxygen is captivated into tiny blood vessels and transported around the torso.

Still, some less agile sharks (such as Nurse Sharks and Zebra Sharks) have got effectually this problem. They're able to spend lots of fourth dimension lazing effectually by sucking water into their mouth and squeezing information technology over their gills.

SINK OR SWIM

To help continue them buoyant sharks rely on:

  • a light skeleton
  • the lift effect produced past their fins as they movement through the water
  • large livers that store low-density oils

In some sharks the liver makes upwardly 25% of their total body weight! In mammals this is only v%. Unfortunately there'south huge demand for shark liver oil, which is used in cosmetics. And then, this adaptation that'southward and so integral to their survival, too makes them vulnerable to homo exploitation.

Some sharks, such every bit the Whitetip Reef Shark, are able to residual on the seabed. To resume swimming they'll propel themselves forward with their tail.

The Sandtiger Shark tin can also hover motionlessly past gulping water at the surface, trapping air in their stomach. Often they tin can be seen letting bubbles out of their mouth. Or the other end...

MUSCLES

Sharks take 2 types of muscle - crimson and white. Red muscle works by breaking downwards the fat in the shark's body. It has a good blood supply and helps the shark swim for long periods of time. White muscle works past using energy from the breakdown of glycogen (sugars). Enabling sharks to make short fast sprints when communicable casualty or escaping danger.

Long bundles of muscle fibres run from the peak of a shark's head to the tip of its tail. When these contract a series of undulations are produced along the body. This enables the shark to propel itself through the water with its tail. More than pronounced muscle contractions produce faster speeds. But, to conserve energy, sharks will build up speed with a series of muscle contractions, so stiffen their body to cruise through the water.

TEMPERATURE Control

Near fish are cold-blooded, then their torso temperature fluctuates with their environment. But there's a grouping of sharks, known equally the mackerel sharks, who tin can warm their claret. This includes the White Shark, Porbeagle, Salmon Shark, Shortfin Mako and Longfin Mako. So, in either sense of the meaning, White Sharks are not the 'cold-blooded killers' they're fabricated out to be.

Retaining warmth makes them much more than efficient predators. A lot of heat is lost through a shark'south gills, where blood vessels are exposed to cooler h2o. To minimise oestrus loss mackerel sharks take a network of tiny capillaries which act as a heat exchange arrangement (known equally a rete mirabile). Claret vessels carrying warm deoxygenated blood to the gills pass alongside common cold oxygenated claret going to the body. Every bit they pass in reverse directions heat is exchanged and returned to the muscles.

Remarkably, the body temperature of mackerel sharks tin can be 10°C higher than the surrounding h2o.

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