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Plastic water bottles can be used to attract sharks to your position, rather quickly evidently.
Yeah, right. And it promotes "unnatural behavior"! I had always considered it BS when humans fish out whatever they like from the sea and poison corals with excessive CO2, then talk about the importance of keeping survivors to their natural behavior and the integrity of food chains. Too late, cause all food chains in the oceans are broken now by overfishing and the corals are dying en masse, so such pseudoscientific puritanism causes nothing but harm.If you are talking about in Great Barrier Reef National Park - very illegal. Also, starts at the wrong place in the food chain (medium to large fish). Many of the sounds in the recording are shrimp, other invertebrates.