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NOAA NCCOS: New England Red Tide Research

Published by National Centers for Coastal Ocean Science | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: February 07, 2026 | Last Modified: 2009-01-01T00:00:00.000+00:00
Alexandrium blooms are one of several algal bloom types often called "red tides," but more correctly referred to as Harmful Algal Blooms (HABs). Alexandrium produces a potent toxin that accumulates in shellfish and can cause illness in humans who eat contaminated shellfish.

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