Red Tide Current Status
Red Tide Mid-Week Update for February 24, 2021
The red tide organism, Karenia brevis, persists in Southwest Florida. K. brevis was detected in 21 samples collected over the past week. Bloom concentrations (>100,000 cells/liter) were observed in three samples from Lee County. Recent satellite imagery (2/23; NOAA, USF) indicates the presence of chlorophyll patches along and offshore of Lee, Collier, and Monroe counties. Additional details are provided below.
- In Southwest Florida over the past week, K. brevis was observed at background concentrations in Sarasota County (in one sample), very low concentrations in Charlotte County (in one sample), background to medium concentrations in Lee County (in 16 samples), and background to very low concentrations in Collier County (in three samples). Samples from Pinellas and Manatee counties did not contain red tide.
- 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.
Fish kills suspected to be related to red tide were reported over the past week in Southwest Florida in Lee County; a fish kill was also reported in Collier County. For more details, please visit: https://myfwc.com/research/saltwater/health/fish-kills-hotline.
Respiratory irritation was reported over the past week in Southwest Florida in Lee County. For current conditions, please visit: https://visitbeaches.org.
Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas to northern Monroe counties predict net western transport of surface waters and southeastern movement of subsurface waters in most areas over the next four days.
View a larger map (February 24, 2021).
The next complete status report will be issued on Friday, February 26th. 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|