Claire Corlett

Fish Food, Fish Tanks, and More
Shark deterrent research revealed

Shark deterrent research revealed


Over the last three years we’ve been
funded by the state government through the Applied Research shark mitigation
program it’s allowed us to test existing shark
deterrent devices currently on the market to provide the public with some
assurance that they actually work the Sharks are adorned with a very
sensitive electroreceptors system so the shark shield would produce a very strong
electric field which would over stimulate the electro receptors and of
course deter the sharks at the same time and we
suspended the the shark shield on a mid-water rig so we suspended this in
the water column and we attracted great white sharks with a bait canister and we
used to control to assess the effectiveness of an active shark shield
vs. and inactive shark shield one of the reasons that we were drawn to Mozzle Bay in South Africa was the existence of a large seal colony within the by this is
the view that scene by the stereo cameras you can see the white white box
there which attracts them to come towards the the rig and the device we
can see here that the visibility is low as it always is in South Africa but can
also see the great whites coming in but are being deterred by the active shark
shield they’re coming within about one point
three metres or so but they’re always changing their behavior away from the
strong electric field emanating from the shark shield as you can see here this is
a large four metre long great white approaching an inactive shark shield
where it’s attracted by the bait and is in fact mouthing the the inactive shark shield this was one of over 300 encounters
and one of 40 individual great white sharks that we were able to monitor during the study. In this
research allowed us to very accurately determine the proximity of which sharks
would approach and we found with this that when the device was active sharks
upon their initial approach would only approach to approximately 1.3 meters
from the device now over subsequent encounters the Sharks would actually
approached slightly closer each time so they would habituate to the device
over time and so there was an overall deterrent effect from the device however it’s important to note that this
is not a hundred percent and so there was one occasion during the testing
where a shark did actually interact with the device while it was active although this was certainly a reduced
interaction compared to when the device was inactive so this was more just the
sharp bumping the device as opposed to actually biting during the control
testing when the device was inactive so with the results of this test and we now
know specifically the electric field characteristics that will deter a white
shark it’s important to note that although the
shaft seal freedom 7 was shown to be very effective in deterring white sharks this result would not necessarily
translate to other electric deterrents. Research was important to us to use
their knowledge of the sensory systems of sharks and their relatives to try and
develop novel deterrence and test existing deterrence this device is no
guarantee of avoiding shark attack unfortunately these are large and rather
unpredictable animals I would hesitate to say that no
deterrent currently on the market and probably entering the market in the future we’ll
be able to one hundred percent guarantee safety but with the this device and
our work the shark shield under the conditions
we’ve tested it certainly is the most effective shark to deterrent device
currently on the market.

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