It is more green on OBX than this. Wonder why, different species of plankton?
Never thought of walking through the wash at the tide line to see it, I always got in the water. You can see it in the waves, too.
Yes, I used to see it in the waves as they crested and crashed.
I tried keeping it in a glass in the house, but it dies; and has to be disturbed to light-up.
I guess there are many different kinds, in different places or under different conditions.