Red Tide Current Status
Red Tide Mid-Week Update for July 28, 2021
A bloom of the red tide organism, Karenia brevis, persists on the Florida Gulf Coast and in Tampa Bay. Conditions remain improved in most areas of Tampa Bay relative to prior weeks. Over the past week, K. brevis was detected in 109 samples. Bloom concentrations (>100,000 cells/liter) were observed in 59 samples: seven from Pasco County, 12 from Pinellas County, three from Hillsborough County, six from Manatee County, 27 from Sarasota County, two from Charlotte County, and two from Lee County. Additional details are provided below.
- In Southwest Florida over the past week, K. brevis was observed at background to high concentrations in and offshore of Pinellas County (in 23 samples), background to medium concentrations in Hillsborough County (in nine samples), background to high concentrations in Manatee County (in 13 samples), background to high concentrations in and offshore of Sarasota County (in 32 samples), background to high concentrations in Charlotte County (in seven samples), background to medium concentrations in and offshore of Lee County (in five samples), and background to very low concentrations in Collier County (in two samples). Samples collected from or offshore of Monroe County did not contain K. brevis.
- In Northwest Florida over the past week, K. brevis was observed at low concentrations offshore of Hernando County (in two samples) and background to medium concentrations in and offshore of Pasco County (in 16 samples). Samples collected from or offshore of Escambia, Santa Rosa, Walton, Bay, Gulf, Franklin, Dixie, Levy, or Citrus counties did not contain K. brevis.
- Along the Florida East Coast over the past week, K. brevis was not observed.
On Florida’s Gulf Coast, fish kills suspected to be related to red tide were reported in Pasco, Pinellas, Hillsborough, Manatee, Sarasota, Charlotte, and Lee counties over the past week. For more details, please visit: https://myfwc.com/research/saltwater/health/fish-kills-hotline/.
Respiratory irritation suspected to be related to red tide was reported over the past week on Florida’s Gulf coast in Pasco, Pinellas, Manatee, Sarasota, and Lee counties. For current information, please visit: https://visitbeaches.org.
Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Hernando to northern Monroe counties predict net southeastern movement of coastal surface and subsurface waters in most areas over the next 3.5 days.
Piney Point Updates
FWC-FWRI is working closely with the Florida Department of Environmental Protection (FDEP) and other partners on the Piney Point response effort. Status updates and results are posted on the Protecting Florida Together website (https://protectingfloridatogether.gov/PineyPointUpdate) and on the Tampa Bay Estuary Program website (https://shiny.tbep.org/piney-point/).
View a larger map (July 28, 2021).
The next complete status report will be issued on Friday, July 30th. Please check our daily sampling map which can be accessed from the top of this page.
Latest Red Tide Status Report Available by Phone
Call 866-300-9399 at any time from anywhere in Florida to hear a recording about red tide conditions throughout the state. Callers outside of Florida can dial 727-502-4952. Standard calling charges apply.
Reports are updated on Friday afternoon except during holidays, in which case the report will be released on the closest day. Additional information, if available, is provided on Wednesday afternoon. To receive an e-mail when the current status has been updated, visit our subscription area.
For additional information about red tide and the current red tide bloom, including information on how to report a fish kill or other wildlife effects, consult health authorities about human exposure, or locate other resources, visit our Red Tide-Related Hotlines and Information Sources article.
Blue-Green Algae Bloom Information
Additional information regarding the current status of algal blooms in South Florida is being consolidated and posted on the Florida Department of Environmental Protection’s website: https://floridadep.gov/dear/algal-bloom.
Key for Results
|Description||K. brevis abundance||Possible effects (K. brevis only)|
|NOT PRESENT- BACKGROUND||background levels of 1,000 cells or less||no effects anticipated|
|VERY LOW||> 1,000 - 10,000 cells/L||possible respiratory irritation; shellfish harvesting closures when cell abundance equals or exceeds 5,000 cells/L|
|LOW||> 10,000 - 100,000 cells/L||respiratory irritation; shellfish harvesting closures; possible fish kills; probable detection of chlorophyll by satellites at upper range of cell abundance|
|MEDIUM||> 100,000 - 1,000,000 cells/L||respiratory irritation; shellfish harvesting closures; probable fish kills; detection of surface chlorophyll by satellites|
|HIGH||> 1,000,000 cells/L||as above, plus water discoloration|