In general, most microorganisms are too small to be seen with the naked eye

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.

Photo Category: Coral Reefs
Photo Location: Caribbean Sea, Cayman Islands
Photo Date: 2007 May 25