I am really, really skeptical when it comes to most shark deterrents. For the most part, the studies that are done are done by the companies that are selling the deterrent, and they’ve got a pretty obvious reason for skewing the results. But how to know whether they’re all just selling snake oil? It sucks to find out the hard way when the hard way is getting attacked by a shark. If you’ve got some time, have a look at an extensive (if very sarcastic) list of different options that may or may not be snake oil. But recently a company that makes those goofy looking “shark-deterring” zebra wetsuits did a study that they claim proves their patterned suits work.
According to the Shark Mitigation Systems, an Australian company that makes a variety of shark deterring products, their patterns do indeed work. When they put a regular black suit in the water beside one of their wetsuits, the regular one took 90 seconds to get attacked while it took about 5 minutes before a shark hit the patterned one.