Red Tide Update 10-2-2025

Published on October 02, 2025

Below are the most recent sample results. No reports of respiratory irritation or fish kills have been received.

To view current Health Alerts issued by the Collier County Department of Health, please visit the Collier County Health Alerts.

No red tide impacts are expected at this time. To get the red tide respiratory forecast, please visit the Gulf Coast Red Tide Respiratory Forecast. To get the current beach conditions, please visit the Mote Beach Conditions Reporting System.

October 6, 2025. Results may be available late Tuesday, October 7, 2025.

**KEY TO RED TIDE LEVELS-Table provided by Florida Wildlife Research Institute (FWRI)***
Description	Karenia breviscells/L	Possible Effects (Karenia brevis only)
NOT PRESENT-BACKGROUND	0-1,000	None anticipated
VERY LOW	>1,000-10,000	Possible respiratory irritation; shellfish harvesting closures ≥ 5,000 cells/L
LOW	>10,000-100,000	Respiratory irritation; possible fish kills and bloom chlorophyll probably detected by satellites at upper range
MEDIUM	>100,000-1,000,000	Respiratory irritation and probable fish kills
HIGH	>1,000,000	As above plus discoloration