Red Tide Current Status
Red Tide Status Update for November 21, 2023
The red tide organism, Karenia brevis, was observed at background concentrations in one sample collected offshore of Southwest Florida over the past week. Other samples collected statewide did not contain K. brevis. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions. Additional details are provided below.
- In Southwest Florida over the past week, K. brevis was observed at background concentrations in one sample collected 36 miles offshore of Monroe 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.
Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas County to northern Monroe County predict variable movement of surface waters and minimal net transport of subsurface waters in most areas over the next 3.5 days.
View a larger map (November 21, 2023).
Due to the holiday this week, the next status report will be issued on Friday, December 1st. 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 to hear a recording about red tide conditions throughout the state. 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|