I don't have any scientific information but I do know anglers that swear in some bodies of water where the fish are heavily pressured (ice fishing) the sound made by the transducer seems to spook the fish.

I have no doubts they can hear the sound -- at least in shallow water -- as sound is amplified in water and I can hear it if I place my ear on a transducer.

It seems plausible that fish that are heavily pressured and have experienced some catch and release could associate the sound with danger.

Last edited by Cecil Baird1; 08/19/08 05:46 AM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.