2 minute read
Shark repellant
TECHNOLOGY
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What is shark repellant?
Learn about the clever technology being developed to keep sharks at bay
Shark repellant technology is still a work in progress to some extent, but there are two main proven methods to keep sharks at bay. These predatory fi sh will stay well clear of other dead sharks when they smell them, and scientists have isolated the chemical source of the odour to several compounds, like copper sulphate. There are also examples of prey taking advantage of the shark’s sensitivity to certain smells, such as the Moses sole, which produces a soap-like substance called pardaxin that sharks hate.
One of the most effective repellants so far, though, exploits the electric sensitivity of the ampullae of Lorenzini on the shark’s nose, which it uses to detect prey and navigate. The device creates a local elliptical electric fi eld that employs a particular waveform that all sharks are sensitive to. This causes uncomfortable (but not harmful) spasms in their snouts that intensify the closer they move to the source, intensify the closer they move to the source, ultimately forcing them to turn away. ultimately forcing them to turn away.
Shark repellant in action
See how surfers might benefi t from one of these anti-shark gizmos Surf’s up
Surfers, divers, kayakers and more are vulnerable to shark attack, but devices like this offer a humane way of keeping the fi sh away.
Electrode
Two electrodes must be submerged in the water for the repellant to work.
Deterrent
Sharks entering the range of the fi eld experience increased discomfort the closer they get to the source, so swim away.
Electric fi eld
The device emits an electric fi eld up to 8m (26ft) around the user.
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