A Port Jackson shark after laying an egg during winter breeding season. A new study has found embryonic sharks 'play dead' in their eggs to avoid predators. Source: PerthNow
A SHARK repellent may be one step closer, with a potential key found in the unique behaviour of the creatures while they are still eggs.
Researchers at the University of WA Oceans Institute today released their study on the reactions of sharks still developing in their egg cases.
The study discovered that shark embryos could sense danger and avoid being detected by 'playing dead' or staying completely still.
Lead author and marine neuroecologist, Ryan Kempster, said the young sharks could sense predators' electric fields and respond by reducing their own movement.
"Despite being confined to a very small space within an egg case where they are vulnerable to predators, embryonic sharks are able to recognise dangerous stimuli and react with an innate avoidance response," he said.
"This knowledge may help us to develop effective shark repellents."
The research found while adult sharks use highly sensitive receptors to detect electric fields from potential prey, embryos of some shark species use a similar method to detect potential predators and avoid being eaten.
The scientists conducted their study on brown-banded bamboo shark embryos and a three-minute film Survival of the Stillest: Bamboo Sharks by Ryan Kempster demonstrating the research, was screened last year at the Beneath the Waves Film Festival in the United States of America.
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