Distribution of HABs in the U.S.
Coastal waters of the United States are subject to most of the major HAB poisoning syndromes and impacts. These include paralytic shellfish poisoning (PSP), neurotoxic shellfish poisoning (NSP), amnesic shellfish poisoning (ASP), ciguatera fish poisoning (CFP), brown tides (BT), cyanoHABs and a number of other HAB phenomena such as fish kills, loss of submerged vegetation, shellfish mortalities, and widespread marine mammal mortalities.
Approximate areas of the U.S. coast affected by various HAB poisoning syndromes and other impacts. Note that cyanoHAB dots and golden alga dots portray geographically general representations
of outbreaks and may represent events occurring in more than one water
body within a state. Note also that not all HABs are depicted in this
generalized view of the U.S.
The following maps depict the frequency of specific HAB problems along the U.S. coast over the last ten years. These data are updated annually to generate a time series of the events.
Last updated: July 31, 2012
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The Harmful Algae Page is supported by a National Oceanic and Atmospheric Administration Center for
Sponsored Coastal Ocean Research Coastal Ocean Program (NOAA/CSCOR/COP) grant to the National Office for
Harmful Algal Blooms at Woods Hole Oceanographic Institution,
Dr. Don Anderson