I don't know the answer, but I had a similar experience a few years ago at a place very much like the place you described. A very high tide was breaching over the sand into a tidal pond, where the outflow had been blocked with sand for a while.
I saw hundreds of blue crabs, I mean they were everywhere, they were leaving the pond and making thier way into the ocean, so many they were in layers. Didn't see any white coloration though. Maybe since the outflow was blocked they had to make it over the sand. Never saw it happen again but I think about it often, and wonder. Wish I had gotten a picture.
|