Seriously, the river was just full of moon jellies. I'm pretty sure they were moon jellies. (We don't say "jellyfish" any more; the fish biologists complained.)
This was in Boston, the pedestrian walkway under the Zakim bridge. No, it was the next bridge down -- we'd just walked across the Charles River Dam walkway and were under the Charlestown bridge. And the water was full of these white things, were they rocks? Garbage? No. They were jellies.
(Arguably garbage anyway. Wikipedia says "symptom of low dissolved oxygen".)
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