WHEN SHARKS GET OLDER

Different species of shark reproduce in different ways; some lay eggs and others give birth to their pups (babies) alive.

Pups are born ready to swim and hunt. They have a full set of razor-sharp teeth from ‘day one’.

A baby shark and an egg case

Young sharks grow as fast as they can because the bigger you are, the safer you are. Lots of larger animals eat baby sharks. Predators include elephant seals, giant squid, big reef fish, and other sharks.

Sharks never stop growing throughout their lives. Bigger sharks do not grow as quickly as they did when they were young. Different species of sharks grow at different rates.

7 m and 2500 kg Great White wiki

Most sharks grow faster in summer than in winter and the change in growth rate leaves a mark in their vertebrae. Age can be determined by counting these rings like counting the growth rings in a tree.

Growth rings can be seen clearly using x-rays

Some sharks may not mature and start producing young until they are 30-40 years old.

Sharks keep growing new teeth throughout their life so they never run out of sharp eating equipment. Some sharks may grow 30,000 new teeth during their lifetime.

New teeth waiting to replace old ones.

Zoology UBC

There are about 440 species of sharks in the world but we only know how long some of them can live.

KIND OF SHARK	ESTIMATED MAXIMUM AGE
Great White Shark	Up to 100 years
Tiger Shark	Longer than 12 and perhaps 30 years
Nurse Shark	About 25 years
Bull Shark	About 25 years
Spiny Dogfish	Possibly up to 100 years
Basking Shark	Longer than 20 and perhaps 50 years
Whale Shark	From 70 to 100 years
Short-finned Mako Shark	From 15 to 25 years
White-tip Reef Shark	About 30 years

Record breaking tiger shark caught as a trophy

Diving with sharks on assignment

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WHAT DO TIGER SHARKS EAT?

Tiger Sharks have a bad reputation and are second only to the Great White Sharks in attacking humans.

Tiger sharks teeth are serrated with powerful jaws making them an ideal killing machine. They are able to bite through the shells of sea turtles.

Tiger Sharks will eat almost anything but dolphins are a favorite food. Studies have shown that 70% of wild dolphins have scars from shark bites (mostly as calves).

In sand tiger sharks, the biggest, strongest pups eat their brothers and sisters while still inside their mother’s body. This seems terrible but guarantees the birth of the most aggressive young.

A Tiger Shark’s teeth are not attached to the jaw, but grow in their flesh. In order to keep the biting equipment in order, teeth are constantly replaced throughout the shark's life.

In 1935, an Australian Tiger Shark spat out a human arm. Police discovered that the shark had not attacked anyone but had eaten the arm after a murder victim had been cut up and thrown into sea.

 


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SWIMMING WITH TIGER SHARKS

Mature tiger sharks can live 45-50 years and reach 6-7.5 metres long. They can weigh more than 900 kilograms.

Tiger Sharks get their name from the vertical stripes found on their bodies. These markings look like ripples of sunlight moving through the water and help them "blend in".

Photographing Tigers on assignment.

Most Tiger Sharks seem to be nomadic and cover long distances. One shark tagged in Hawaii was recaptured off the coast of South Africa. Others stay within a smaller range and may patrol a beach or bay.

Keep low and pay attention.

A Tiger Shark’s teeth make them dangerous to handle. One trick Reef Ninja uses is to roll them on to their backs. They seem to go to sleep (this is called tonic immobility).

Tiger Sharks can be unpredictable and divers must be very cautious. It is easy to believe that the sharks like our company and that they can be trusted.

Mature sharks have less pronounced strips compared to juveniles.

More people are struck by lightning than killed by sharks. You should be scuba diving instead of standing in the rain!

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