Mr.

Moss Landing Harbor, Moss Landing, CA. Harbor full of Vellela, also the first half mile of Elkhorn Slough which drains into the harbor. This was around 11am PT, on a falling tide. Light West winds. My guess is they washed into the harbor and Slough on rising tide, which peaked around 8:30am, and were in the process of washing back out. The outbound current was fairly slow at 11am, and was countered by the wind, so they weren't moving much.