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Biomimicry Week Sharks' Repellant
01 July 2013

Sharks' Repellant

Why don't sharks get covered in algae like most other marine animals? This question may seem trivial, but unlocking the big fish's secret has led to new materials that inhibit bacterial growth. Shark skin possesses tiny riblets arranged in a repeating diamond pattern, which makes it harder for organisms to hang on and establish colonies. Synthetic material that imitates this unique trait (right column) has a significantly reduced build-up of bacteria than a similar surface without the special ridges (left column). After three weeks (bottom row), bacteria are only beginning to establish themselves on the "shark skin", whereas the basic material has been completely engulfed. With antibiotic resistant bacteria – such as the superbug MSRA – becoming increasingly common, finding new ways to fight infection is a major challenge for the future. Medical equipment and implants imprinted with shark skin patterns offers a great way to bite back.

Written by Jan Piotrowski

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BPoD stands for Biomedical Picture of the Day. Managed by the MRC Laboratory of Medical Sciences until Jul 2023, it is now run independently by a dedicated team of scientists and writers. The website aims to engage everyone, young and old, in the wonders of biology, and its influence on medicine. The ever-growing archive of more than 4000 research images documents over a decade of progress. Explore the collection and see what you discover. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

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