Sunday, June 24, 2018

Sharkbanz - yes it's a total Scam!

Source.

Bingo.

Remember this post?
What followed were a Shark bite and then a devastating impromptu test - and yet the Garrisons and even more problematically, Craig O'Connell of questionable Shark Week fame have continued to defend the indefensible and conned the public (scroll down) into believing that the gizmos had been tested scientifically and proven to be effective, which they clearly never had.

But now those independent tests have been performed.
Bravo to Charlie, and big kudos to Andrew who continues to make GSD proud.

This is a great illustration of the test setup.


And this is the reaction of GWS' to the Shark Shield ( Ocean Guardian ) Freedom+ Surf which is actually the only repellent that worked, albeit only a measly 60% of the time which IMO just ain't quite good enough - or is it?



And the Banz?
And I cite,
Neither the SharkBanz bracelet nor leash affected the behaviour of white sharks or reduced the percentage of baits taken.
These products rely on permanent magnets (Grade C8 barium ferrite), which have previously been used to overwhelm the electromagnetic sense of sharks .....

However, the distance from which sharks reacted to magnets in those studies was small, typically less than 0.5 m  and the effectiveness of the magnets decreased with increasing shark motivation.
Barium-ferrite permanent magnets generate a flux that decreases at the inverse cube in relation to the distance from the magnet, from near 1000 G at the source to an amount comparable to the Earth’s magnetic field (0.25 – 0.65 G) at distances of 0.30 – 0.50 m, showing how rapidly the magnetic field decreases. Sharks would therefore need to be at less than 0.30 m for such magnets to act as real deterrents.
This suggests that magnets are unlikely to be effective at deterring sharks because they will only protect close to the magnet, limiting their applicability as personal deterrents...
Exactly what I said back then!
Incidentally, same same for the ludicrous Chillax wax!
Those of you who remember the episode of Mythbusters where Lemon Sharks were completely unfazed after ingesting balloons filled with mashed habaneros may remember that lacking that necessity, Sharks have simply not developed receptors for capsicain - so a concoction of eucalyptus, chilli, cloves, cayenne pepper, neem, tea tree oil, citronella, coconut, and beeswax was always gonna be a stretch. And it sure was.
Disappointed reaction here - and no, it just doesn't bloody work and sure ain't commonsense, either!

You can read the paper here, and here is a great synopsis by Corey.
Once again (re-read it!), this is not principally about the perpetrators that can (and should!) be taken to court. It's about the public as those things may actually lead to MORE Shark strikes because as Corey states
if a particular type of commercially available shark deterrent happens to be less effective (or completely ineffective) as advertised, it can give users a false sense of security, potentially encouraging some to put themselves at greater risk than is necessary. For example, some surfers and spearfishers probably ignore other mitigation measures, such as beach closures, because they ‘feel safe’ when wearing these products.
Exactly - so be careful people!
If it looks too good to be true, it usually is - so forget those gizmos and best use your common sense, and you should just be fine.

In diesem Sinne - enjoy the ocean!

1 comment:

Yannis said...

A minor point, but they also all assume shark magnetoreceprion is via electroreception which has never been shown and in fact there is evidence of magneto receptors.