Skip to content

Harmful Algal Blooms threaten human and ecosystem health, and disrupt aquaculture and wild fisheries, tourism, and other resources in marine and freshwater systems.

What are Harmful Algal Blooms (HABs)?

Marine and fresh waters teem with life, much of it microscopic and most of it beneficial and harmless. There are, however, some species of algae and cyanobacteria that cause harm, either through the production of potent toxins or through the accumulated biomass during their “blooms”. Impacts include human and wildlife illness and mortality, ecosystem disruption, and economic losses to coastal communities.

HAB Species

Learn about different toxic or harmful algal species, and the poisoning syndromes they cause


See where harmful algae are distributed in the U.S. and around the world


Discover how harmful algal blooms impact human health and coastal economies, wildlife, ecosystems, and more


Learn about the national and international research programs focused on understanding, managing, and preventing harmful algal blooms


Major programmatic and informational resources regarding harmful algal blooms, as well as fact sheets and hotlines


Programs and activities focused on prediction, control, mitigation, and HAB event response

News and Announcements

Fall Edition of Great Lakes HABs Newsletter Now Available

November 23, 2020

Published quarterly, the HABs Collaborative Newsletter provides updates on the current work being conducted by the Collaborative and its members. The Fall Edition of the Newsletter is now available HERE.

Read More

Small Business Innovation Research (SBIR) Program Call for Proposals

October 21, 2020

The NOAA Small Business Innovation Research (SBIR) Program is soliciting proposals for Phase 1 applications, due on January 13, 2021.  This opportunity is open to small businesses involved in research and development.  HABs are specified in two of the topic areas: “Omics in Monitoring and Detection” and “Uncrewed Systems”.  Information about this opportunity is available…

Read More

65th Issue of Harmful Algae News Released

September 29, 2020

A collaboration between the IOC and UNESCO, Harmful Algae News is a free newsletter describing recent updates in the global study of HABs, as well as publicizing networking and training opportunities for professionals. The newsletter can be found here.

Read More

Conferences, meetings, workshops, and other events

June 2, 2020

A timeline of upcoming conferences, meetings, workshops, and other events of interest to the HAB community is available under the “Resources” menu of this website. Information regarding events that have been rescheduled due to COVID-19 will be posted as it becomes available. Click here for more information.

Read More

Be SMAAT! Join the Social Media Action Alert Team!

May 12, 2020

Are you active on social media? Do you want to engage your networks to help with HAB-related legislative action items? If so, contact Holly Bowers to be added to the team ( A few times per year members are provided with ready-to-post messaging and hashtags to share on Facebook, Twitter, Instagram and LinkedIn. Your small…

Read More

New article collection for the Algal Research Community: Algal Research and Harmful Algae Partner with Data in Brief

March 26, 2020

Data in Brief is partnering with Algal Research and Harmful Algae to publish an ongoing article collection of data announcements called  “Algal Announcements,” which will include: (1) announcements of harmful algal blooms, and (2) announcements of new algal strains; objective is to provide freely available info benefiting researchers, policymakers, entrepreneurs, water managers, engineers, etc. Additional…

Read More

Additional article categories in Harmful Algae

March 26, 2020

The journal Harmful Algae has recently expanded the types of articles it is soliciting to include several short communication categories: Policy Analysis; Mini-Reviews; Perspectives (for detailed descriptions, see link here), in addition to original research articles, review papers, and book reviews.

Read More

Northeast Algal Symposium 2020 – Postponed

March 6, 2020

The 59th Annual Northeast Algal Symposium has been postponed until 2021.  This conference will now be held April 9-11, 2021 in Burlington, Vermont. Please visit the Northeast Algal Society’s website for more information:

Read More

IFHAB Workshop – Postponed

February 3, 2020

In response to the COVID-19 pandemic, this year’s workshop has been cancelled, and will be rescheduled for 2021.  Additional information will be posted as it becomes available.

Read More

2020 Course on Identification of US HABs – cancelled

January 16, 2020

The Provasoli-Guillard National Center for Marine Algae and Microbiota (NCMA) has cancelled the 5th U.S. training course on the identification of harmful algae in the U.S. marine waters, which was to be offered from August 19-29, 2020. Information about the course can be found HERE. We will post an update when the course has been rescheduled.

Read More