Shawn-
I think your comments are valid, and that this is a multi-faceted phenomenon.
I agree with flatflyn that an approaching low causes the fishing to shut down until it passes. I've been become friends with several guides in the Carib., and during the slack time on the flats, we've discussed this occurance, and the possible reasons. They don't have an answer either, and could only guess that perhaps a fish's lateral line, which sense vibrations, may also sense pressure.
Bill
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