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Alan, The point I think he was really making, and it is a very valid one, is that the ocean is a very unpredictable place and therein is contained all manner of noising making aquatic life. If in addition to these noise sources, you add but a simple rain squall, the effects on a passive listening device could be equally unpredictable as to its performance. There are just so many variables to contend with in the broadband spectrum of sound. David Bartsch From: alanjames@xtra.co.nz To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] revelation Date: Mon, 22 Feb 2010 09:19:15 +1300 Hi Jay,
There are round 700 fish species in NZ waters. About 97% of these you would never come across in your
life time. I checked with a freind who is 7x NZ casting champion & repairs fishing reels for a living;
he'd never heard of a croaker fish in NZ. I used to draw fish & memorize their scientific names, but
haven't come across a Croaker fish. We have a gurnard that "barks" when you land it. But it's nothing
like a Croaker.
Interesting "The sounds are produced by the beating of abdominal muscles against the swim bladder"
Maybe we could exploit the fact that the submarine is similar to a large swim bladder.
Alan
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