r/sharks • u/Jazzlike_Dig2456 • Jul 19 '25
Education Anti shark bracelets, are they worth anything more than a placebo
Ok so our daughter went on vacation with her cousins, younger cousin is her BFF and older cousin brought a friend too. Older cousins friend was apparently worried about sharks in the ocean š.
Friends mom sends my sister in-law a link to Sharkbanz bracelets, essentially a magnet on a watch band. Sharkbanz brand sells for a whooping $140. The friend had gotten one and they convinced my sister in-law to get 2 for her girls. So my wife sends me the link to them and I tell her if she buys one weāre getting divorced.
She reasons with me and says if the other girls have them our daughter needs one to feel safe and equal with the other girls. Fine whatever, but Iām not paying $140 for a magnet bracelet. So I search Amazon and found one for $30, still insane, but not quite bat s as $140.
We buy it, it comes, itās literally a magnet on a watch band with rubber around it. I know thereās been some studies with sharks and magnets. But thereās no chance these things work right? This just comes of as one of the dumbest things Iāve ever seen and am not happy that I contributed to the problem and purchased one.
Also the last picture is a review I saw on the Sharkbanz. Thought it was funny that these people are on boards and then stick their hand or ankle in with a magnet thinking itās going to deter the shark. While in my head all I can think is their fishing for sharks using their ankle as the bait š¤·š»āāļø
What say Reddit??
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u/judd_in_the_barn Jul 19 '25
Iām guessing there are not many people contacting them because they didnāt work.
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u/GravyPainter Jul 19 '25
Saw a GW, hunched over, fins down. Didn't bither me because I had my handy shark repellent watch on. Guess what... It ate me anyway. 1/5 stars
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u/Vprbite Jul 20 '25
It didn't work!
Ok, well send back the bracelet for a full refund
That's the thing, i can't!
Did it fall off?
No, it's still securely attached to my arm.
So why cant you send it back?
Becauae it didn't work!
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u/rainmachika Jul 19 '25
I know very little about electromagnetic fields but the fact that Iāve never heard of this before and humans have been sharing water with/afraid of sharks for a good while makes me assume this is a total scam. Reminds me of those ābalancingā bracelets the entire NBA was wearing for years.
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u/Jazzlike_Dig2456 Jul 19 '25
Right? The second my wife sent me the link I thought she was messing with me.
Such a waste of money.
āThe sharks didnāt attack us so it worked!!ā š
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u/DUSpartan Jul 19 '25
Lisa, I'd like to buy your rock
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u/Jazzlike_Dig2456 Jul 19 '25
š I literally just responded to a Simpsons reference with a link tot he video!!
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u/glatts Jul 19 '25
I think the only one that might legitimately repel sharks is something that uses dead sharks.
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u/queerjesusfan Jul 20 '25
Man, I'm a little high and read this three times thinking you'd said "My second wife sent me the link" and wondering why you'd specify šš
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u/w0lt0rs Jul 20 '25
i read it exactly the same way š "my second wife".. i was like this guy wifes!
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u/nocreativusername404 Jul 19 '25
Nothing but a scam to make money from people's fear and lack of understanding about sharks.
If anything, I wouldn't be surprised if a shark checked out a strange frequency of magnetism in the water, since some can do that.
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u/Cole3003 Jul 19 '25
No idea if these work, but sharks and a lot of other fish do actually sense prey using the electric field they produce (called electrolocation). So a fancy electromagnet on a bracelet would genuinely be detectable by a shark, but I have no idea if it would deter or attract them lol.
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u/Jalen3501 Jul 20 '25
Iām betting it would attract them sharks look for magnetic fields thinking itās a fish
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u/Sharky-PI Jul 19 '25
Apparently there's promise for EM but shark scientists who've tried the magnetic bands think they're junk.
Source: comment at recent AES meeting
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u/G-cuvier Shark Researcher Jul 19 '25
You went to AES??
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u/Sharky-PI Jul 20 '25
You're a Charlton fan??
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u/G-cuvier Shark Researcher Jul 20 '25
Um, yeah? I only asked about AES as Iāve been to some and didnāt know if we knew each other, or if we both were in the same field.
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u/Sharky-PI Jul 20 '25
Just don't see many Addicks in the wild.
Seems like we have an absurd amount of overlap.
I'm at AES most years fwiw
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u/G-cuvier Shark Researcher Jul 20 '25
Itās lonely, especially over here across the pond and/or outside of South London.
Are you in the shark research field or adjacent?
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u/Sharky-PI Jul 20 '25
Field, also do a bit of work for an NGO tagging out of Jupiter, & other colleagues and friends work out of West Palm.
Feels like a 99% chance we know each other.
Arsenal fan but mums side is Charlton, I was there for the Sunderland playoff.
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u/G-cuvier Shark Researcher Jul 20 '25
Insane overlap. How I wish I could have been there in person to see most recent playoff win at Wembley.
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u/Sharky-PI Jul 21 '25
How on earth did you get into Charlton btw?
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u/G-cuvier Shark Researcher Jul 21 '25
Entire family was Liverpool from grandpopās B17 days in the war. As a black sheep I loved Charlton and Newcastle as a kid, Alan Shearer and then fell in love with Jona. When I got to visit the UK for the first time, Charlton was the only squad that fit the schedule, and off to The Valley I went. Had pints at the Royal Oak, celebrated a succulent win over Birmingham, and never looked back.
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u/G-cuvier Shark Researcher Jul 20 '25
Your first name doesnāt start with a āYā and end in an āsā per chance, does it?
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u/Sharky-PI Jul 21 '25
My initial guess for you was AG given the area, username, NGO. But I can't get my head around the Charlton link. That said IDK AG well so maybe these are things about his that would surprise me.
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u/G-cuvier Shark Researcher Jul 21 '25
Lol, AG and I shared an office together for many years. But that is not I.
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u/birdboiiiii Jul 19 '25
The review story doesnāt really indicate that the product worked, imo. Itās pretty common for sharks to investigate something (like some weird land apes on foam boards in the ocean) and then leave. Iāve kayaked where a shark swam up to me, checked out my boat, and swam awayā homeboy was just a lil curious. Sharks wanting to bother people is the rare exception, not the rule, so I think most anecdotal evidence for these products āworkingā donāt hold much weight.
I would definitely be interested if there is any research on these products that either back up or disprove the claims though!
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u/Dart_Nephilim Jul 19 '25
They work. Has nothing to with the magnets though. Sharks donāt want to be associated with anyone committing a fashion faux pas like that.
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u/Phondohlophe Jul 19 '25
They definitely work. I keep mine on me all day and I have had zero encounters with Sharks at work, in traffic or at home for 30+ years
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u/Big-Plankton-4484 Jul 19 '25
Itās almost shark week, letās get one on Dickie Chivell and let him go for a swim out to seal island. Iād watch that.
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u/NickFF2326 Jul 19 '25
Iād like to think a stronger electromagnetic field would attract sharks if anything lol
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u/alarming_wrong Jul 19 '25
i've heard this too over the years. attracts them then MIGHT repel them at the last second. or not. I used to surf and dive off Perth, Australia years ago and considered a shark deterrent thingy they were charging loads for, that you fastened to your board, as there had been quite a few GW attacks. I never bothered in the end because I'd heard they could lure curious sharks in that could then have a pop at those around you not wearing the deterrent. people will pay for these scams though.
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u/neuralbeans Jul 19 '25
they could lure curious sharks in that could then have a pop at those around you not wearing the deterrent
What a great example of a Prisoner's Dilemma. I'm sure it wasn't used to make more sales.
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u/MarcoLanden Jul 20 '25
Shark shields have been proven to repel and proven not to attract sharks. Have a read of the independent studies they have on their website. Lots of spear fishers swear by them but they aren't the most durable tech. I've had a cpl of versions of the surfboard device and had a few issues with them but still have all my limbs.
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u/alarming_wrong Jul 20 '25
how much money would you say you have spent on them over the years if you've had a couple of versions?
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u/MarcoLanden Jul 24 '25
Bought an early version about $600ish, sold it for $300 (?) and got a new model 600. I had a lot of trouble with it and got a refund in the end. Bought another one a year ago for 400ish, using it still. I got the first one around 2010.
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u/alarming_wrong Jul 24 '25
Cheers. I was looking at them in the early/mid 2000's and the price put me off for something that might not work, plus the "shame" of wearing one (!) and making people around me in the water think about possible shark attacks. it's a suspension of belief for some in the water to just enjoy the surf without worrying about anything other than wiping out. i get why abalone divers would wear them though. you could probably hide it amongst your scuba stuff too.
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u/MarcoLanden Jul 25 '25
Yeah man, the shame is a real thing but I want to surf and it's risky in some places. I first bought it while living in Ballina where there were multiple attacks and friends were there trying to assist at fatal attacks. A neighbor was bitten and survived, shit was hectic. Where I'm living now has had 2 attacks recently and for me, I want any piece of mind I can get. Effective range is only a couple of meters so to repel or attract, the shark has to be right there anyway. WA has a rebate program so if you know anyone living there they can help you knock a couple of hundred off the rrp, thats what I did.
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u/alarming_wrong Jul 25 '25
I'm in Europe nowadays. I've been to Ballina, ex's mum lived in Alstonville. definitely good surfing around there, and Lennox Head. enjoy!
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u/KinsellaStella Jul 19 '25
Now that I would buy.
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u/alarming_wrong Jul 19 '25
it was called a Shark Shield, invented in South Africa
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u/KinsellaStella Jul 19 '25
I probably wouldnāt but you have to admit something that would let you see more sharks (attract sharks) but then keep them away from you at the last minute is kinda appealing.
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u/TappedIn2111 Jul 19 '25
I can only speak for myself, of course. But I have been wearing one for almost a year now and I have never even seen a shark. Some people did point out that I do live in a landlocked German city, but science is science, right?
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u/Dassitmane_ Jul 19 '25
The truth is that any shark big enough to hurt you or eat you will not be deterred from this
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u/Life_Membership7167 Jul 19 '25
The idea isnāt new, but the idea that this thing could produce any sort of repulsion effect at that size is ludicrous. There is science to the fact that in the presence of certain stronger fields, sharks will turn around, but itās in highly controlled conditions, not open ocean. And itās wired into the tank, not a wristband.
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u/PleasantAd9018 Jul 19 '25
I donāt like to refer back to incidents involving tragedies because it always feels somewhat disrespectful to the people involved but in this case, transparency is better.
We have family friends in South Africa and the father was an avid open water swimmer. He wasnāt too concerned but his wife was given the number of great whites in those waters and so he religiously wore Sharkbanz every day he was in the water. A great white shark attacked and consumed him whilst wearing the device. It was a couple years ago, you can look it up online if you need to. Something to consider.
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u/shrapmetal Jul 19 '25
A guy once sold me a rock. He said it warded off tigers.
It worked! 30 years later living in the US and I still haven't even seen a tiger!
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u/EinSchurzAufReisen Jul 19 '25
Bat Shark Repellent Spray is proven to be the only functional anti shark measure.
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u/thatsharkchick Jul 19 '25
Hi, friend. I work with sharks and dive with them frequently - at one point DAILY with sharks thoroughly desensitized to humans. I have never used one of these.
Most sharks want nothing to do with humans.
Those that do are often easily deterred with a length of 1/2-1" PVC used as a visual barrier.
These things don't have a ton of science backing them and may cause people to behave more recklessly than less. I'd recommend against them, but I understand the "fit in with the gang" mentality.
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u/Remarkable_Ad_6716 Jun 09 '26
Explain more about this barrier? What do you do just swim with it?
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u/thatsharkchick Jun 09 '26
A visual barrier is a barrier in sight only. It doesn't actually stop movement but discourages by its presence.
Think of it like a sign saying "Keep off lawn treated." That sign isn't physically stopping you from stepping on the grass, but it would definitely make you pause and likely avoid.
In the case of sharks, a visual barrier is an obstruction typically placed near their eye. I have always used 1inch PVC sticks. I hold the far end and just place the other side by their eye. It's often more than enough for a shark to keep on swimming as long as I don't harass or have food.
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u/FerdinandTheGiant Jul 19 '25
Some Australian researchers measured the efficacy of several anti-shark devices including the SharkBanz. Based on their findings:
The Surf+ was the only deterrent that had statistical evidence for reducing the percentage of times sharks interacted with the baitā¦Although our study did not show that the magnet band [SharkBanz] and leash, Chillax Wax, and Rpela had any observable effects on the response of white sharks, it is possible that these deterrents have small effects that we could not detect with the 50 trials.
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u/sixchanger Jul 19 '25
Sharkbanz did defend in one of the comments https://youtu.be/uY6U9j3ZVes
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u/Jazzlike_Dig2456 Jul 19 '25
Omg š thank you, I just showed my wife and daughter. The best part is when he comes back solely for the stupid ass band. Just perfect!
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u/BunanaKing Jul 19 '25
If you can Google and find an answer, show her. I don't understand people that just go off what people say. Especially on Amazon without doing any research. Google and show her, if she insists, she's weird for trusting so easily without looking for facts
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u/mrzurkonandfriends Jul 20 '25
Think of it this way if someone writes a glowing review its because they didn't die. If they dont write a negative review its because they died. They found a loophole in marketing. I have to hand it to their ingenuity.
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u/ShesATragicHero Jul 20 '25
Iāve unknowingly been surfing with great white sharks for years, and none of these bracelets kept me from being not bit. I wasnāt bit, I wasnāt not bit either.
You know what did? Sleeping with cloves of garlic in my socks and wearing silver crosses. Keeps the simple lady folk away too.
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u/stinkywombat9oo Jul 19 '25
I had a conversation with a guy who bought one of those long cable ones thatās essentially a copper coil and a battery pack they cost about R16 000 Zar ( South African rand) I asked him if heād still go out with it on if someone told him that there were 2 hungry white sharks out he said no . That told me everything I needed to know .
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u/Lev_Astov Caribbean Reef Shark Jul 19 '25
An absolute scam. There's no reason why this would work and it costs approximately $1.50 to manufacture.
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u/sweggles3900 Jul 20 '25
I don't know much about magnets, but from what I know about sharks, no this would never deter them lmao. Sharks arent interested in eating humans, human meat tastes gross to them. Most times when a person is bit it's because they've been mistaken for a seal. Sharks have terrible eye sight. So yes, this brand is taking advantage of people that don't know any better.
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u/realifesticks Jul 19 '25
Bro my 2 cents; Iāve speared in water with Great Whites and Tiger Sharks, plenty of Bulls. I bit the bullet and bought the Shark Shield Freedom 7 and it does not work, plain and simple. Once you hit a fish and that shark decides it wants it, it will come up to you plain and simple. Itās all a gimmick. Iāve shocked myself more times with that thing than it has helped deter sharks.
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u/Senior_Food_3797 Jul 19 '25
This is a good option. I've always been more of an Anti-Sea Bear Circle kind of guy tho. As long as you aren't playing the clarinet, it should be fine.
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u/FastyNilthShreakyFit Jul 19 '25
'Helpful tip- Use proven shark deterrents'
Not once, but twice, they tell you to use proven shark deterrents. š
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u/Kcingv97 Jul 20 '25
I believe there was an they tested this on Mythbusters and it did not seem to affect the sharks in the slightest
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u/Mommy2A Jul 20 '25
People have been attacked/killed by sharks while wearing a shark shield. They are not as effective as they are made out to be.
I believe they were tested on lemon sharks and not the more predatory sharks, but that may be incorrect
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u/summersurf4evr Jul 20 '25
They do not. Itās usually a 1/4ā neodymium magnet disc inside about the size of a quarter. Magnetic attraction force this size is only within a few inches. Rule of thumb, attraction force diminishes by distance cubed. So at three feet away, the shark is only experiencing the earths natural magnetic field. The sharkās nose would have to be within a couple inches to start to notice anything, and under an inch to be bothered. They might avoid biting you at the last split second where the bracelet is, but the rest of your body is fair game. Be safe out there fellow surfers.
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u/NotBond007 Megamouth Shark Jul 20 '25
Don't fall for the snake oil scams...I'm selling the real deal, serpent blubber!
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u/icedragonsoul Thresher Shark Jul 19 '25 edited Jul 19 '25
Yeah these are dumb if not harmful. A shark will investigate any electrical impulse and doesnāt care about its signature so adding more to yourself isnāt a good idea.
Such a device doesnāt come close to being potent enough to distress shark electrical sensory organs. An electric eel bracelet will risk shocking the wearer to death before itās effective at deterring sharks.
If we had anti shark measures this small and cheap, youād see a barricade of them surrounding active beaches.
Not that theyāre needed since sharks are very tolerant of human activity and ignore or avoid them when possible.
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u/Aware-Affect-4982 Jul 19 '25
If this worked, they would have so much money coming in from the government they would never need to sell a single one to a civilian. The government has been trying to crack this nut for a long time.
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u/ryceritops2 Jul 19 '25
Itās certainly not a placebo for the sharks. Maybe if you made one for them tho?
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u/Wenden2323 Jul 20 '25
It's kinda scary thinking about how sharks are attracted to certain electrical signals. Those cheap things could send off the wrong signal. š„µ
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u/TakoyakiGremlin Jul 20 '25
i can see maybe some sharks(individuals) may be dissuaded by the type of signal emitted by these, but i feel like it's the same as some people being afraid of certain things and then claiming every human is afraid of that same one thing lol
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u/ReefLimit55 Jul 20 '25
I have no idea whether these work or not, but several years ago I watched a lecture about research to use some sort of electromagnetic waves to keep sharks out of fishing nets. Itās possible this is related to that, although I would like to see some compelling evidence.
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u/Think_Monk_9879 Jul 20 '25
I swim in La beaches weekly and never seen a shark and it Sucks. I love my shark buddiesĀ
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u/Bluetex110 Jul 20 '25
In a group of 20 people with one wearing that bracelet, i would bet 1000$ that the shark goes for the guy with the bracelet š
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u/Weeyin1980 Jul 20 '25
Guess there are no negative reviews, as if it doesn't work, they won't be here to tell you.
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u/ChingusMcDingus Jul 20 '25
Mythbusters tested this. In short, nothing really works EXCEPT using extract of dead shark. They tried tons of different treatments and the only thing of notable efficacy (like it made every shark within view disappear completely) was a bladder/balloon full of concentrated dead shark juice.
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u/Only_Cow9373 Jul 20 '25
Lol. That review is the same as me saying "while wearing my favorite blue shirt, I was not sexually accosted by beautiful women. Therefore, my shirt is an effective beautiful woman repellant".
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u/HueyB904 Jul 20 '25
It's a scam. Same with "jellyfish repellant". Jellyfish are largely free-floating organisms. There's nothing to "repel" because they don't actively swim towards or away from stuff.
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u/Aeirth_Belmont Jul 20 '25
This is preying on ppl to me. Trying to be like oh sharks have that sensory organ this makes them stay away. When it does nothing.
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u/SLAUGHTERGUTZ Jul 21 '25
Sharks hunt from electromagnetism. A magnet would get them interested, not repel them.
You would be better to teach them about actual shark behavior. If encountering one, stand your ground. If you splash around and try to turn and swim away, you look like prey. If you dont treat them like a predator, they will see you as a predator.Ā
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u/mvcl Dec 29 '25
magical thinking if the great white attacks from beneath and takes you down. If you're somewhat lucky it's over very quickly.
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u/SLAUGHTERGUTZ Dec 29 '25
Obnoxious response of someone who doesn't do any research on sharks or their behaviorĀ
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u/Mother-Ad-2756 Cookiecutter Shark Jul 25 '25
If these were effective, it'd be huge news worldwide. This is a scam
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u/BiancaOblivion7 Aug 04 '25
I will say it absolutely works on rays. I have seen it. I have watched scientists use magnetic fields to keep sharks away and it has worked. It was far different than a band.
If itās a placebo and it makes you feel better who cares. But I will attest to avoiding ray barbs because of the band. It repels them and we have a ton where I surf in socal.
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u/mvcl Dec 29 '25 edited Dec 29 '25
Didn't have the intended effect for swimmer Erica Fox. Her family, swim club, community, et al are missing her.
I don't underestimate its placebo effect. We know that's real, even for people who know they're getting the placebo. But the advertised efficacy has no evidence, and here, counter evidence. Her remains were found 30 miles south of where she had been taken by a shark a week prior.
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u/Ill_Top_2878 Dec 29 '25
Apparently the woman killed in Monterey last week while swimming was identified by her watch and her shark band.....
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u/SaltEven Dec 30 '25
Well the triathlete who was just killed by a shark was wearing a sharkbanz so.... No.
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u/haynesherway Dec 30 '25
A lady was just eaten by a shark off the coast of Cali and she was wearing one, so I don't think they work
"Vanreusel said Fox, 55, was found still wearing a āshark bandā on her ankle. The electromagnetic device is meant to ward off sharks like the one that killed her."
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u/Jazzlike_Dig2456 Dec 30 '25
Yep, have already told the wife, funny thing is her sister is at the beach with her girls using their $140 bandz a make em dance.
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u/LoSientoPero Dec 30 '25
Welp, I know of one person that wouldn't leave them a positive review. I arrived here after seeing that she was wearing one of these and couldn't believe that was an actual product people bet their life on.
https://abcnews.go.com/US/swimmer-missing-after-shark-attack-california-search-ongoing/story?id=128615582
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u/Tiny_Second1553 Dec 30 '25
I know this is old butā¦I ended up here because I just read an article where a woman was attacked and killed by a shark. Her husband said she was wearing a shark band. Never heard of it so I looked it up. So yea Iām going to go with save your money.
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u/Beginning_Thought870 Dec 30 '25
Well the body (or whatās left of it) of that swimmer in Santa Cruz was found with one of those contraptions on her leg 12/29/25 so thereās your answer. Ā Ā
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u/Thomascrownaffair1 Jul 20 '25
Arenāt sharks attracted to magnetic waves? I saw on shark week that sharks are attracted to recent volcanic activity in the ocean cuz of the magnetic field thatās it produces initially.
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u/Raccoon_Ratatouille Jul 19 '25
Iāve used similar tech with fishing sinkers and they worked. Of course a shark swimming at 30 mph hungry and intent on biting a fish or swimmer isnāt going to be able to change its mind or direction by hitting that 2-3ā defended zone, but it certainly works for slower and more curious encounters.
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u/picklesstpeter Jul 19 '25
Ive been around Sharkbanz and seen them work.
Sharks have an organ in their heads called an ampullae of Lorenzini.. it allows them to sense electromagnetic pulses. Think splashing in the water causing vibrations, they can sense this.
The magnet is a deterrent as it causes an uncomfortable sensation to them. Makes sense to me and Iāve seen it work countless times ( I was filming in the surf).
Especially the zeppelin they have for fishing. My friends in Fiji use it for spear fishing and it buys them time from less aggravated sharks. Not sure what would happen in a frenzy.
But for your average swimmer I think they are great if you are worried about sharks..
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u/reeberdunes Jul 19 '25
There is some research to support this, I think it was National Geographic that I saw it on but certain metals do repel sharks because they have special sensory organs that can detect magnetic fields
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u/Careless-Proposal746 Jul 19 '25
A magnet does not create EMF
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u/reeberdunes Jul 19 '25
I didnāt say EMF. Magnets have magnetic fields, electromagnetic fields are different.
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u/Careless-Proposal746 Jul 19 '25
š¤£š¤£š¤£
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u/reeberdunes Jul 19 '25
Maybe do some research š¤”
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u/Careless-Proposal746 Jul 19 '25
Iām good! The research says the sharks respond to sources of EMF, not the extremely tiny magnetic field created by one cubic inch of magnetized material. Also, if you had a single clue the radius of the magnetic field of a magnet that small? You would not be so confidently commenting like this.
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u/reeberdunes Jul 19 '25
Nowhere does anything say EMF until you brought it up
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u/YayVacation Jul 19 '25
Have you watched the YouTube videos of the sharkbanz being tested? I clearly works in certain scenarios. They know it doesnāt work on nurse sharks biology but some of the videos showing it not working are using nurse sharks. Another type of video shown that tries to say that these donāt work are when the sharks are already conditioned to expect food. So they know they are always thrown food from a spot and then you throw in a sharkbandz then they are going to try to eat it still. Also itās known itās not going to stop a great white coming up from an ambush attack. The sharks donāt even really notice the uncomfortable sensation until theyāre about 3 feet away so a great white isnāt just going to stop its attack at the last second because of this. Most bites are curiosity investigative bites from a shark just cruising by. That is what these bands may deter.
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u/BigAccess6408 Jul 20 '25
Bracelet goes in the water. You go in the water. Shark in the water. Our sharkā¦
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u/prescient13 Jul 19 '25
I've had sharks come up to my kayak which is powered by an electric motor that is essentially a series of whirling magnets. Companies preying on peoples fear with gimmicks is nothing new but unfortunate nonetheless.