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Sorry for the lare post but I just saw the question. Those are glowing polychete worms (segmented worms). Or more correctly they are the reproductive segments of polychete worms. The worms live in burrows in the bay mud and cannot leave thier holes to spawn so each year they grow extra segments that hold the sperm and eggs. They cut these segments, called epitokes, loose at certain moon phases. The epitokes rise to the surface and whirl around to mix the eggs and sperm. Why they glow I don't think any one knows. Many marine polychete reproduce this way and in some south Pacific Islands the epitokes, called palolo worms, are collected and concidered a delicacy. Mike
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