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.
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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