I think it's very clear they can hear it in shallow water. I would never, ever risk that they would be spooked by the sound.
But then again, plenty of smart people (I sometimes and used to fish with) also don't think twice about rattling an anchor chain, putting the trolling motor on high, dragging an ice chest, slamming a storage compartment, stomping their feet to get rid of a horsefly, it goes on and on and on.
Plenty of people wonder why they never catch many fish, too.
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