In recent years, intense blooms of Karenia brevis red tide and Microcystis aeruginosa cyanobacteria, known commonly as blue-green algae, have plagued Florida waterways, impacting the state’s economy, environment and public health. Though notable in their duration and intensity, these harmful algal blooms, or HABs, are not uncommon. Florida experiences a variety of HABs in its marine and fresh waters. This webpage contains information and outreach materials about harmful algal blooms in Florida.

Red Tide Toolkit


Social Media Plan: Red Tide Info and Emergency Responses

HABs Infographics

HABs Response Infographics

HABs PowerPoints


Using Satellites To Detect & Forecast Harmful Algal Blooms


K. Brevis Red Tide Safety & FAQs


HABs Detection Video

HABs Liaison

Betty Staugler, Florida Sea Grant extension agent based in Charlotte County, was recently named Florida Sea Grant HAB liaison to National Oceanic and Atmospheric Administration’s National Centers for Coastal Ocean Science (NCCOS). The lab forecasts and models harmful algal blooms occurring in Florida and the Southeast. Betty will work with NCCOS researchers to create and distribute data, tools, and outreach materials to groups and individuals working to help Florida prepare for and weather blooms.

Harmful Algal Bloom State of the Science Symposium

UPDATE: A consensus document from the 2019 Harmful Algal Bloom State of the Science Symposium was published in February 2020. A pdf of the document can be downloaded here:

State of the Science for Harmful Algal Blooms in Florida: Karenia brevis and Microcystis spp.

In August 2019, Florida Sea Grant and University of Florida’s Institute of Food and Agricultural Sciences convened a meeting of more than 70 HABs experts at the U.S. Geological Survey offices in St. Petersburg to discuss the state of research on HABs in Florida.

Click on the link below to read more about the symposium and to access PDFs of the presentations and program book.

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The UF/IFAS Florida Sea Grant Harmful Algal Bloom State of the Science Symposium brought together researchers from around the state and across the country to discuss what is known about HABs, especially Karenia brevis red tide and Microcystis aeruginosa cyanobacteria — two main HABs impacting the state. The group was tasked with assessing the current state of the science and prioritizing research needs in the areas of:

• Initiation, development and termination of blooms
• Prediction and modeling
• Detection and monitoring
• Mitigation and control
• Public health

Download a PDF of the Florida HABSOS Symposium Program Book.

Plenary I

Session – Initiation, Development, and Termination

Session – Prediction & Modeling

Session – Detection & Monitoring

Session – Mitigation & Control

Session – Public Health

Session – Emerging Issues


Faculty and Staff