Just curious here. To what extent might tide travelling crabs become vulnerable to fish predation? Do all sizes of blue crabs do this, or are only those basically too big to likely be swallowed engaging in an otherwise risky behavior?
I don't live near the salt, and have over the years had limited ops to observe what all goes on there, but when I have had the chance have only seen adult crabs scuttling along just below the surface of the water. Doesn't mean smaller specimens don't do the same, of course. I suppose that after the biggest stripers depart the bay for points north, a different size-class of crab can more or less safely ride the tide?