Shark OFF at Shark Lab

Lose the Fear

Love the Ocean

                 Deet you

         know that bug

      repellents are

   effective for

 keeping bugs

away but are  bad

for sharks?


The Science - Do Shark Repellents Really Work?


You know sharks have superpowers, right? You’ve heard they can smell blood in the water for long distances. It’s true. But did you also know sharks (and rays) can feel the teeniest amount of electricity imaginable? Our patented, non-magnetic active element uses that sensitivity against them harmlessly and naturally.

It’s kryptonite for sharks!

Shark OFF - How it Works

Shark OFF - How it Works

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Want to Know How Shark Repellents Work?

Over 450 million years of evolution have created one awesome apex predator (sharks!). You may have heard that sharks can smell blood from long distances, which is true, but did you also know that they can sense the most minute electrical impulses? Using sensors called the ampullae of Lorenzini (elasmobranchs like sharks and rays have them), they can pick up ridiculously tiny electric signals. 5/1,000,000,000ths of a volt in fact (yes, that’s billionths). This sense is so fine that sharks can detect the heartbeat of another fish. Scientists suspect the ampullae of Lorenzini may be used for hunting – finding other fish in distress, or in murky waters, or even hiding under sand. 

Shark Sensory System Diagram
Shark Snout

Shark OFF turns those very senses against the shark – and over stimulates them. While a super low voltage field (like the rapidly beating heart of an injured fish) may attract sharks, Shark OFF’s higher voltage field repels them. Our patented active element gives off enough voltage to make the shark jerk away from it but it is imperceptible to us. The proprietary alloy that makes up the active element emits an electric field in water of about 1.5 volts – billions of times stronger (literally) than what the shark’s ampullae of Lorenzini can feel. The effect on the sharks is absolutely blinding – but you don’t feel a thing.


Still Not Convinced?

Let's start from the beginning... Shark OFF was born in bed. No, it’s not a bad joke. The founders of Shark OFF, Shea & Geoff Geist, were in bed watching TV one night. Along came a PBS NOVA program (yup, that’s a plug for public TV) called Hunting The Elements - kryptonite for Sharks. David Pogue of NOVA was interviewing one of the scientists that discovered the technology used in Shark OFF. 

As David and Dr. Patrick Rice discussed the shark repellent properties of rare earth elements, we were totally blown away. We were amazed that we had never seen a product using this technology. Why was this not in beach shops EVERYWHERE? 

After pursuing it further, we found that this research was dedicated to the reduction of shark bycatch in commercial fishing and not as a deterrent against human interaction. Inspired by Shea’s debilitating fear of the ocean and the vision of this unmet need, we dived in to bring this amazing technology to beachgoers around the world. 

So, here we are. We love to help people overcome their misguided fears and allow them to better enjoy the peace and beauty of the oceans – all while providing education about sharks, the extremely limited risk of shark attack, and their important role in the ecosystem.

Our commitment to