red tide, the common name for ‘algal bloom’, is caused by high levels of phytoplankton accumulating to form dense, visible clouds near the surface of the water. due to the varying colouring of the phytoplankton’s pigments, these algae blooms range in colour too. although aesthetically stunning, this naturally occuring phenomena sometimes results in a high death rate amongst certain marine life due to an increase in karenia brevis algae.
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