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GeorgeyG said..
Works well for stopping bull and whites but the opposite effect on tigers
I think the real question we should ask ourselves is:a) is the shark attack on human a case of mistaken identity for the seal
because shark did not use vision as the primary sense receptor but vibration, hearing, electroreceptors, lateral line due to murky water?
or
b)
was really relaying on vision ?
I encourage you to first examine how the sharks detect their prayer (or competition as GeorgeyG may be pointing at above).dlnr.hawaii.gov/sharks/about-sharks/senses/I personally have observed how Shark Cousins and Manta Ray Cousin called "Chimaeras" the "Spotted Rat Fish" detect crustaceans hiding in the mud by their heartbeat and pound precisely.
Here is more details on my website:
mareksk.smugmug.com/Underwater-Photography/Puget-Sound-Critters/Fish/Sharks-their-cousins/Spotted-Ratfish/Fortunately in Puget Sound / Salish Sea (Western USA/ Canada) even some of the largest Sharks: Six Gill Sharks are not interested in humans (scuba divers can swim along). There is a documentary about it:
www.pbs.org/video/kcts-9-documentaries-searching-mystery-sharks-seattle/For me personally even swimming or windsurfing with any sharks is fine.
There are much more intimidating creatures even for the Mature Great White Sharks. You would be surprised. I am not talking about Killer Whales / Orcas. I am talking about Mature Steller Sea Lions:
More reading on that:
www.dailymail.co.uk/news/article-2442406/Sea-lion-taunts-GREAT-WHITE-SHARK-biting-tail.htmlSteller Sea Lions can be protective of their harems, haulouts, I have personal story, photos and research about them:
I posted more for Windsurfers on NW Windtalk:
groups.io/g/nw-windtalk/message/69488and also NWDiveClub with pictures & more research:
Bizarre encounters with Steller Sea Lion at Possession Pt Pk Oct 23rd 2014www.nwdiveclub.com/viewtopic.php?f=11&t=23569