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‘Red Tide’ Brings Night Light Show To San Diego Beaches

September 29, 2011 6:14 p.m.

Red tide is a common name for a phenomenon also known as an algal bloom, in which large concentrations of aquatic microorganisms, such as phytoplankton, accumulate rapidly in the water, causing discoloration at the surface.

Related Story: 'Red Tide' Brings Night Light Show To San Diego Beaches