As reported by California Diver: Beginning August 27, a very large and potent red tide reached the shoreline areas of the Sonoma Coast. Since then, as a result of this phytoplankton bloom, tens of thousands of abalone have died and washed ashore, covering the beaches at the tideline. Divers are reporting dead or dying abalone just about everywhere along this stretch of coastline.
California Diver: Sonoma County Abalone Die-Off: Photos & Update