Red tide refers to a harmful algal bloom (HAB) characterized by the proliferation of certain types of microalgae, particularly dinoflagellates, in coastal waters. These blooms can produce toxins that are harmful to marine life, humans, and the environment. The term "red tide" comes from the reddish or brownish color that the water can take on when these algae are present in high concentrations, although the water may not always appear red.
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