Florida Red Tide and other Harmful Algal Blooms (HABs)

Florida Red Tide and other Harmful Algal Blooms (HABs) The Fish and Wildlife Research Institute (www.MyFWC.com) in conjuction with Mote Marine Laboratory (www.mote.org)

This page is a product of the FWRI-Mote Cooperative program, which aims to mitigate the adverse effects of Harmful Algal Blooms (HABs), specifically the Florida red tide, Karenia brevis, along the Florida Gulf coast. This continuing program promotes monitoring, research, and public education, which are of critical concern to the State of Florida.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
08/28/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables, regional maps, and an interactive Google Earth map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

Over the past week, the red tide organism, Karenia brevis, was observed in 13 samples from Florida’s East Coast. Bloom concentrations (>100,000 cells/liter) were present in one sample from Nassau County. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions. Imagery from August 27 revealed elevated chlorophyll levels in Nassau and Duval counties (see Statewide Red Tide Status map below).

Additional details follow.
• In Southwest Florida over the past week, K. brevis was not obeserved.
• In Northwest Florida over the past week, K. brevis was not observed.
• Along the Florida East Coast over the past week, K. brevis was observed at very low to medium concentrations in Nassau County, background to low concentrations in Duval County, and background to low concentrations in St. Johns County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict net northern movement of surface waters and variable transport of subsurface waters from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, September 4. View our Social Media Policy: https://bit.ly/3qsncNb
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On the left is a map of Florida showing locations of water samples collected August 20 through 27, and analyzed over the past week, as detailed in the Red Tide Status Reports dated August 28 on our Red Tide Current Status page. Map on the right is a zoomed in version showing sample locations from Nassau County to St. Johns County, overlaid on a map showing chlorophyll concentrations from satellite imagery dated August 27, 2026. Chlorophyll imagery provided by the Integrated Red Tide Information System.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
08/21/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables, regional maps, and an interactive Google Earth map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

Over the past week, the red tide organism, Karenia brevis, was observed in 25 samples from Florida’s East Coast and at background concentrations in two samples from offshore of Southwest Florida. Bloom concentrations (>100,000 cells/liter) were present in one sample from Nassau County. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions. Imagery from August 19 revealed elevated chlorophyll levels in Nassau and Duval counties (see the Statewide Red Tide Status Map below).

Additional details follow.
 In Southwest Florida over the past week, K. brevis was observed at background concentrations in two samples collected offshore of Pinellas County.
 In Northwest Florida over the past week, K. brevis was not observed.
 Along the Florida East Coast over the past week, K. brevis was observed at background to medium concentrations in Nassau County, background to low concentrations in Duval County, and background and very low concentrations in St. Johns County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict variable movement of surface and subsurface waters from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, August 28. View our Social Media Policy: https://bit.ly/3qsncNb
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On the left is a map of Florida showing locations of water samples collected August 13 through 20, and analyzed over the past week, as detailed in the Red Tide Status Report dated August 21 on our Red Tide Current Status page. Map on the right is a zoomed in version showing sample locations from Nassau County to St. Johns County, overlaid on a map showing chlorophyll concentrations from satellite imagery dated August 19, 2026. Chlorophyll imagery provided by the Integrated Red Tide Information System.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
08/14/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables, regional maps, and an interactive Google Earth map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

Over the past week, the red tide organism, Karenia brevis, was observed in 20 samples collected along Florida’s East Coast and at background concentrations in one sample from Northwest Florida. Bloom concentrations (>100,000 cells/liter) were present for the first time this season in two samples from Duval County. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

• In Southwest Florida over the past week, K. brevis was not observed.
• In Northwest Florida over the past week, K. brevis was observed at background concentrations in one sample from Pasco County.
• Along the Florida East Coast over the past week, K. brevis was observed at very low to low concentrations in Nassau County, very low to medium concentrations in Duval County, and very low concentrations in St. Johns County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict net southern movement of surface and subsurface waters in most areas from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, August 21. View our Social Media Policy: https://bit.ly/3qsncNb
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A map of Florida showing locations of water samples collected August 6 through 13, and analyzed over the past week, as detailed in the Red Tide Status Report dated August 14 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
08/07/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables, regional maps, and an interactive Google Earth map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

The red tide organism, Karenia brevis, was observed at background to low concentrations in 13 samples from Florida’s East Coast, and background concentrations in seven samples along Florida’s Gulf Coast. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

 In Southwest Florida over the past week, K. brevis was observed at background concentrations offshore of Hillsborough County, and in Manatee, Charlotte, and Collier counties.

 In Northwest Florida over the past week, K. brevis was observed at background concentrations in Wakulla County.

 Along the Florida East Coast over the past week, K. brevis observed at background to low concentrations in Nassau County and background to very low concentrations in Duval County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict northwestern movement of surface waters in most areas and variable transport of subsurface waters from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, August 14. View our Social Media Policy: https://bit.ly/3qsncNb
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A map of Florida showing locations of water samples collected July 30 through August 6, and analyzed over the past week, as detailed in the Red Tide Status Report dated August 7 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
07/31/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables, regional maps, and an interactive Google Earth map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

The red tide organism, Karenia brevis, was observed at background concentrations in one sample from Southwest Florida and five samples from Florida's East Coast. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

• In Southwest Florida over the past week, K. brevis was observed at background concentrations in one sample from Charlotte County.
• In Northwest Florida over the past week, K. brevis was not observed.
• Along the Florida East Coast over the past week, K. brevis was observed at low concentrations in one sample from Nassau County and background to very low concentrations in four samples from Duval County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict net southeastern movement of surface and subsurface waters in most areas from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, August 7. View our Social Media Policy: https://bit.ly/3qsncNb
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A map of Florida showing locations of water samples collected July 23 through 30, and analyzed over the past week, as detailed in the Red Tide Status Report dated July 31 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
07/24/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables and regional maps. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

The red tide organism, Karenia brevis, was observed at background concentrations in one sample collected offshore of Southwest Florida. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

• In Southwest Florida over the past week, K. brevis was observed at background concentrations in one sample from offshore of Sarasota County.
• In Northwest Florida over the past week, K. brevis was not observed.
• Along the Florida East Coast over the past week, K. brevis was not observed.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict variable movement of surface and subsurface waters from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, July 31. View our Social Media Policy: https://bit.ly/3qsncNb
________________________________
A map of Florida showing locations of water samples collected July 16 through 23, and analyzed over the past week, as detailed in the Red Tide Status Report dated July24 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
07/17/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables and regional maps. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

The red tide organism, Karenia brevis, was observed at background concentrations in one sample from Florida’s East Coast. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

• In Southwest Florida over the past week, K. brevis was not observed.
• In Northwest Florida over the past week, K. brevis was not observed.
• Along the Florida East Coast over the past week, K. brevis was observed at background concentrations in one sample from St. Johns County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict net southern to southeastern movement of surface and subsurface waters in most areas from Pinellas to northern Monroe counties.

The next status report will be issued on Friday, July 24.

View our Social Media Policy: https://bit.ly/3qsncNb
________________________________
A map of Florida showing locations of water samples collected July 9 through 16, and analyzed over the past week, as detailed in the Red Tide Status Report dated July 17 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
07/10/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables and regional maps. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

The red tide organism, Karenia brevis, was not observed in samples collected statewide over the past week. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict variable movement of surface and subsurface waters for Pinellas to northern Monroe counties.

The the next status report will be issued on Friday, July 17.

View our Social Media Policy: https://bit.ly/3qsncNb
________________________________
A map of Florida showing locations of water samples collected July 2 through 9, and analyzed over the past week, as detailed in the Red Tide Status Report dated July 10 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
07/01/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with a data table and statewide map. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

Over the past week, the red tide organism, Karenia brevis, was observed at background concentrations in two samples from Florida’s East Coast (Nassau County) and one sample from offshore of Southwest Florida (Monroe County). We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

No fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict variable movement of surface and subsurface waters from Pinellas to northern Monroe counties.

Due to the upcoming holiday, the next status report will be issued on Friday, July 10. View our Social Media Policy: https://bit.ly/3qsncNb
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A map of Florida showing locations of water samples collected June 23 through 30, and analyzed over the past week, as detailed in the Red Tide Statewide Table dated July 1 on our Red Tide Current Status page.

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), whic...
06/26/2026

For the most updated information on our sample results, please check our daily sampling map (MyFWC.com/redtidemap), which can be accessed via the online status report on our Red Tide Current Status page (https://myfwc.com/research/redtide/statewide/). Our online status report includes a full detailed Red Tide Report with data tables and regional maps. For more information on algal blooms and water quality, please visit Protecting Florida Together at https://protectingfloridatogether.gov.

Over the past week, the red tide organism, Karenia brevis, was observed at background concentrations in one sample from Florida’s East Coast. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions.

Additional details follow.

• In Southwest Florida over the past week, K. brevis was not observed.
• In Northwest Florida over the past week, K. brevis was not observed.
• Along the Florida East Coast over the past week, K. brevis was observed at background concentrations in one sample from Nassau County.

No Fish kills suspected to be related to red tide were reported to FWC's Fish Kill Hotline or other partners over the past week.

Respiratory Irritation suspected to be related to red tide was not reported over the past week in Florida. For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf Coast Harmful Algal Blooms Forecast.

Short-term (3.5 day) forecasts by the USF-FWC Collaboration for Prediction of Red Tides predict variable movement of surface and subsurface waters for Pinellas to northern Monroe counties.

Due to the upcoming holiday, the next status report will be issued on Wednesday, July 1.

View our Social Media Policy: https://bit.ly/3qsncNb
________________________________
A map of Florida showing locations of water samples collected June 18 through 25, and analyzed over the past week, as detailed in the Red Tide Status Report dated June 26 on our Red Tide Current Status page.

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