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I'm not sure what you mean by softer, but the Doppler effect refers to a
lowering of the frequency of sound, not a decrease in volume.

For those who haven't seen it, this bioluminescence in what I believe is
called La Baia dos Fosforos is really spectacular - this is not the piddly
glow we often think of as phosphorescence, nor even the light of massed
fireflies, but almost fireworks in the water.

Bill Silvert

----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, March 29, 2005 2:32 PM
Subject: squeaky door fish


> Kayakers observing bioluminescence (obviously at night) in a bay in
> eastern Puerto Rico are
> reporting fairly loud sounds they hear from their kayaks as "sounding like
> a squeaky door being
> opened and closed" that gets louder as the organism (presumably a fish or
> school of fish)
> approaches, and due to Doppler effects, softer after it passes by.

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