Red Tide Current Status

FWC reports on the current status of Karenia brevis blooms using tables, static maps, and interactive Google Earth maps. Archived status maps can be found in our Flickr gallery.

Red Tide Status (September 23, 2016)

A bloom of the red tide organism, Karenia brevis, has been observed in Southwest Florida along Manatee and Sarasota counties.

Karenia brevis was observed in Southwest Florida in background to very low concentrations in five samples collected from Pinellas County, background to high concentrations in forty-one samples collected from Manatee and Sarasota counties, background to very low concentrations in three samples collected from Charlotte County, background to low concentrations in five samples collected from Lee County, and background to very low concentrations in four samples collected from Collier County. One sample collected alongshore of Okaloosa County (Northwest Florida) contained very low concentrations of K. brevis.

Additional samples collected throughout Florida over the past week did not contain K. brevis.

Fish kills affecting multiple species, along with slight respiratory irritation, have been reported in Manatee and Sarasota counties since September 19th. Forecasts for Southwest Florida by the USF-FWC Collaboration for Prediction of Red TidesExternal Website show southern, alongshore movement of surface waters, and southern, onshore movement of bottom waters between southern Pinellas and Lee counties over the next 3 days.

Additional information regarding the current status of algal blooms in South Florida is being consolidated and posted on the DEP websiteExternal Website

Red Tide Status Map (September 23, 2016)

Statewide red tide counts September 15 - 23, 2016

View a larger map Adobe PDF (September 23, 2016)

Regional Status Reports and Maps Adobe PDF (September 23, 2016)

Southwest coast report and map
East coast report and map
Northwest coast report and map

To see detailed information on this week's samples, view the current Statewide Google Earth map for September 23, 2016.

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. External Website

The FWRI Red Tide Status Line is now available to callers throughout the state. FWRI updates the recording each Friday by 5 p.m. Red Tide Status Line: 866-300-9399 (toll-free inside Florida only); 727-552-2448 (outside Florida).

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.

Previous Regional Status Reports and Maps

September 16, 2016
Southwest coast report and map
East coast report and map
Northwest coast report and map
Google Earth map

September 9, 2016
Southwest coast report and map
East coast report and map
Northwest coast report and map
Google Earth map

September 2, 2016
Southwest coast report and map
East coast report and map
Northwest coast report and map
Google Earth map

Additional archived status maps can be found on Flickr

Key for Results

Description Karenia brevis cells/liter Possible Effects (K. brevis only)
NOT PRESENT - BACKGROUND background levels of 1,000 cells or less None anticipated
VERY LOW >1,000 to 10,000 Possible respiratory irritation; shellfish harvesting closures >  5,000 cells/L
LOW >10,000 to 100,000 Respiratory irritation, possible fish kills and bloom chlorophyll probably detected by satellites at upper limits
MEDIUM >100,000 to 1,000,000 Respiratory irritation and probable fish kills
HIGH >1,000,000

As above plus discoloration


Hotlines and Information Sources



FWC Facts:
It is common for closely related species such as bluegill (bream) and redear sunfish (shellcracker) to hybridize or spawn with each other.

Learn More at AskFWC