One theory is the deeper water on eastern side is saltier and tends to move up the bay - regardless of current. It also tends to be warmer then the fresher water near surface
I've noticed early season the Rock tend to be deeper on out going current.
Once we get some bait migrating near the surface - I'll bet the Rock move upwards - at least to feed.
I've seen them in late March on calm days just under the surface.
One old timer told me they are getting warmth from the sun - using their dark back as a heat exchanger. Not sure if that is the case or first foot or two is warmer due to sunny day.
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