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Algal Bloom -- A rapid growth of microscopic algae or cyanobacteria in water, often resulting in a coloured suds on the surface.

Red Tides -- A discoloration of seawater caused by a bloom of toxic red dinoflagellates.
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Red tides - very often red dinoflagellates undergo such rapid multiplication that they make the sea appear red.this is known as red tides.

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