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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 active element uses that sensitivity against them harmlessly and naturally. It’s kryptonite for sharks!

Some Shark Science

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. 


The Science of Shark OFF®

Shark OFF® turns those very senses against the shark – and overstimulates 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.

Shark Defense Technologies

NONE of this would be possible without the groundbreaking discovery and continued research of Dr. Eric Stroud and Dr. Patrick Rice at SharkDefense Technologies LLC. While working diligently to save millions of sharks from incidental death, they gave birth to a technology that will help millions experience the ocean with less fear. You would literally not be reading this right now if they had not dedicated their careers to saving millions of sharks accidentally killed by long-line fishing every year.

Shark OFF® is proud and blessed to be the sole licensee of  SharkDefense Technologies LLC’s electrochemical patent 8,951,544 B2 and to have their full support and incredible knowledge backing our work. Check out their website for all the information you could ever want to read on electrochemical, magnetic and chemical shark repellents.

The Bimini Shark Lab

There is no better place in the world for field research on sharks than the Bimini Biological Field Station Foundation. Fact check me. I double dog dare you. Our dearly-departed friend, Dr. Samuel “Doc” Gruber founded the station and fostered an enduring crew of top notch researchers, PHDs, graduate students, staff and dedicated volunteers down in the Bahamas. You will find no shark authority more respected than Doc was. We miss you, Doc.

Science Backed by The World's Leading Researchers

Exhaustive research has been done into the myriad elasmobranch sensory systems. For the purposes of our research Hueter et al 2004 – Sensory Biology of Elasmobranchs summed up those abilities and offered a relatively simple yet comprehensive explanation of our focus – the ampullae of Lorenzini.

As the PBS special indicated, these rare earth elements caused strong reactions in elasmobranchs (sharks and rays) using their ampullae of Lorenzini against them. Since this discovery many experiments have been conducted. The studies cited below tested differing lanthanide alloys in a wide variety of water temperatures, locations, depths, species, captive animals, wild animals, tanks, pens, baits, and methods. These present strong evidence showing the efficacy of electropositive metals as a deterrent, especially in the environments we see our products most being used – shallower, warmer and lower-visibility waters.

Compliments You Won't Have to Fish For.

Our shark repellent is something you’ll want to wear at the beach, grocery store, and even on a night out. Oh, and you look great!


Robert E. Hueter, David A. Mann, Karen P. Maruska, Joseph A. Sisneros, Leo S. Demski

2004 – Biology of Sharks and Their Relatives​

Allan W. Stoner, Stephen M. Kaimmer

2008 – Reducing elasmobranch bycatch: Laboratory investigation of rare earth metal and magnetic deterrents with spiny dogfish and Pacific halibut​

Eric Stroud, Patrick Rice, Shark Defense Technologies, LLC

2008 – NOAA Shark Deterrent and Incidental Capture Workshop – A Small Demonstration of Rare Earth Galvanic Cell

Brill, R., Bushnell, P., Smith, L., Speaks, C., Sundaram, R., Stroud, E., Wang, J.,

2009 – The repulsive and feeding-deterrent effects of lanthanide metals on juvenile sandbar sharks (Carcharhinus plumbeus).

Tallack, S. M. L., Mandelman, J. W.

2009 – Do rare-earth metals deter spiny dogfish? A feasibility study on the use of electropositive “mischmetal” to reduce the bycatch of Squalus…

M.R. Hutchinson, J.H. Wang, K. Holland, Y. Swimmer, S. Kohin H. Dewar, J. Wraith, R. Vetter, C. Heberer, J. Martinez

2010 – The effects of electropositive metals on shark catch rates and behavior​

W.D. Robbins, V.M. Peddemors, S.J. Kennelly

2011 – Assessment of permanent magnets and electropositive metals to reduce the line-based capture of Galapagos sharks, Carcharhinus galapagensis

Shark Jewelry Repellent
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Family On Lilo Relaxing On The Beach
Two Brothers Are Walking On The Beach
Cute Dog Of Dachshund, Black And Tan, Wearing Red Sunglasses, Having Relax And Enjoying Buried In The Sand At The Beach Ocean On Summer Vacation Holidays
Shark Off Repellent Beach

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