Watch
out! Stay away from the water….are words of
horror screamed over one glimpse of these fast deadly 1.5m
bull sharks.
They
are only the kids of the sea but they hold the reputation
as the world’s most notorious shark.
Bull
sharks are extremely territorial predators that enjoy using
canals as their own personal playground.
Instead
of swings and play equipment these fascinating creatures cruise
from the nursing ground of the Nerang River to canals in Surfers
Paradise, Sea World and Broadbeach.
These
young sharks tend to favor areas which are deeper, darker
and populated by bait fish.
While small, these sharks can chow down between one and 10
per cent of their body weight weekly with favorites including
fish, other sharks, rays, dolphins, turtles, birds and crustaceans.
However there have been some incidences where the splashing
of a swimmer has been mistaken for a struggling fish and as
a result the hungry bull shark zooms in for a feed.
These
concerns are addressed in Sea world’s new exhibit Shark
Attack - Bull Sharks in our backyard.
Sea World Director of Marine Sciences Trevor Long says the
majority of attacks occur during low light at night or early
morning.
“Sharks have always been a creature of mystery and fear
and Shark Attack will explore the myths surrounding the sharks
while educating people on how to avoid having interactions
with these remarkable animals,” he says.
Trevor
adds that he would like to see some empathy towards bull sharks
with these creatures suffering at the hands of humans.
“What
follows after a shark incident is that people want to eradicate
them, we get people catching them on line and clubbing the
sharks with timbers,” he says.
“This
tells me is there is not enough value placed on these animals,
we need to understand their role and why we need them in our
water system.” |
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Indeed
before you start demonising these fascinating creatures it
is important to note they play an important part in keeping
the waterways healthy.
Previous
studies show that if you were to remove bull sharks from the
waterways the quality of the marine ecosystem would go into
decline.
Additionally
there is common misconception that thousands of bull sharks
are invading the canal system when in reality populations
of large marine predators are in dangerous decline.
It
took months to acquire nine bull sharks for the Shark Attack
exhibit as the canal system was not home to huge numbers of
these amazing creatures.
Griffith
University shark expert Jonathan Werry who has been monitoring
the bull sharks for the last four years and worked closely
with Seaworld to develop this new attraction says that bull
sharks make specific excursions into the canals looking for
food.
“They
move from one side of the canal system to another so they
know exactly where they are going,”
“They
move on a two-three week cycle, what people are seeing is
the same sharks over and over again.”
When
these kids grow up they head out to sea and start a family.
Studies
indicate that these creatures live for about 14 years and
prefer to breed in river mouths.
Surprisingly
the female bull shark is larger than the males winning the
battle of the sexes at about 2.9 metres long and weighing
about 200 kg.
The
males tend to be about 2.1 metres long and only weigh around
90 kg.
On
average the female tends to give birth to litters of one to
13 pups after carrying eggs in her womb for one year.
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