Red Tide Current Status
Red Tide Status Update for May 7, 2021
The red tide organism, Karenia brevis, persists in Southwest Florida. Over the past week, K. brevis was detected in 58 samples, with bloom concentrations (>100,000 cells/liter) observed in five samples from Charlotte County, three samples from Lee 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, background to low concentrations in both Manatee and Sarasota counties, background to high concentrations in Charlotte County, background to high concentrations in or offshore of Lee County, low to high concentrations in Collier County, and background concentrations in Monroe County. For additional information, view the Southwest Coast report and map.
- In Northwest Florida over the past week, K. brevis was not observed. For additional information, view the Northwest Coast report and map.
- Along the Florida East Coast over the past week, K. brevis was not observed. For additional information, view the East Coast report and map.
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/).
Fish kills suspected to be related to red tide were reported over the past week in Manatee, 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. Additional details are provided in the Southwest Coast report and 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 surface currents and southeastern net movement of subsurface waters in most areas over the next four 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 (May 7, 2021).
To see detailed information on this week's samples, view the current Statewide Google Earth map for May 7, 2021.
By using Google Earth, you can zoom in to specific locations and click on stations to see detailed information, including sample date and cell concentration. You must have Google Earth installed on your computer to view this map; the software can be downloaded from the Google Earth website.
The next complete status report will be issued on Friday, May 14th. 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|