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On Nov 15, 2003, at 7:47 AM, Keith Williams wrote:

> To clarify - I have only heard this noise when I have been down below
> in
> a boat. The noise appears to come from all parts of the hull below

I heard the noise best when inside the boat.  I thought it was the teak
walls expanding when our air conditioning had been running at first.  I
would open the saloon door out to the aft deck and could not hear the
sound, but later in the evening I stood upon the dock next to our
vessel and could very clearly hear the sounds, almost as well as when I
was inside the vessel.  I think therefore that the area under the docks
was also being effected by the krill as well as the hull of the vessel.
  The sounds had more of a scraping component to them than what the gas
bubbles of a school of herring would have (I think).

The captain of our vessel said that he stayed one night at anchor at
Dragon Point (Indian Harbor Beach, FL, ICW mile 914) a year or two ago
when the noise was so loud that they could not sleep as a result.  The
noise was so bad that he considered not staying at the same place
again, but we needed to stay there again for this trip -- and of course
there was no noise at all there this time. My observations were at the
St. Augustine city marina.

   

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