Red Tide Current Status
Red Tide Mid-Week Update for May 5, 2021
The red tide organism, Karenia brevis, persists in Southwest Florida. Over the past week, K. brevis was detected in 48 samples, with bloom concentrations (>100,000 cells/liter) observed in three samples from Charlotte County and two samples from Collier County. Additional details are provided below.
- In Southwest Florida over the past week, K. brevis was observed at very low concentrations in Hillsborough County (in two samples), background to low concentrations in Manatee County (in 10 samples), background to low concentrations in Sarasota County (in 15 samples), low to medium concentrations in Charlotte County (in four samples), background to low concentrations in and offshore of Lee County (in 12 samples), and background to high concentrations in Collier County (in five samples). Samples from Pinellas County 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.
In Southwest Florida, patches of the marine cyanobacterium, Trichodesmium, have recently been reported in offshore, coastal, and nearshore waters. This alga blooms each year, has not been shown to be toxic in Florida’s waters, and often resembles sawdust but can change color as it decomposes. For more information, please see posts on our Facebook page (https://www.facebook.com/FLHABs) and information about Trichodesmium on our website (https://myfwc.com/research/redtide/general/trichodesmium/).
In Southwest Florida over the past week, fish kills suspected to be related to red tide were reported in Manatee, Sarasota, Charlotte, Lee, and Collier counties. 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 Manatee, Sarasota, Charlotte, Lee, and Collier counties. For current information, please visit: https://visitbeaches.org.
Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas to northern Monroe counties predict variable movement of surface and subsurface waters over the next four days with net northern transport.
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 (May 5, 2021).
The next complete status report will be issued on Friday, May 7th. 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|