In general, most microorganisms are too small to be seen with the naked eye. However, these tufts of filamentous cyanobacteria form large accumulations of individual microscopic cells that are visible. Cyanobacteria often form large aggregations that produce toxins and are detrimental to marine organisms and humans, collectively called harmful algal blooms. Images Courtesy of the Twilight Zone Expedition Team 2007, NOAA-OE.
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Cayman Islands Twilight Zone 2007
