"Aerial of Scripps Pier taken from 450 meters (1,500 feet) during a Tetraselmis sp. bloom. This green flagellate is roughly 10 micrometers in size, and has been found in concentrations as dense as 15 million cells per liter of seawater. The foam became more prevalent at the end of July, though it has been observed off and on since the first week of July. Its patchy distribution makes it visible only at some beaches and the foam becomes more apparent in the afternoon when the wind and waves mix the surface waters. Tetraselmis has bloomed each summer since 2009 with blooms lasting from one week to several months. There are no documented health hazards with swimming or fishing in areas of Tetraselmis blooms."
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