Red tide threatens spring break on Tampa Bay's southern shores

• Manatee County has cleaned up around 3.5 tons of dead fish in the past two weeks, per the Bradenton Herald.
• Reports of respiratory irritation and dead fish have come from as far north as the Dunedin Causeway in Pinellas County, and south to Monroe County, as the enormous bloom lingering off the Southwest Florida coast grows bigger and its toxic fumes intensify.

Context: Red tide is a naturally occurring organism in the Gulf of Mexico that sometimes blooms to toxic levels.

• A bloom developed near Fort Myers last fall and hasn't subsided.

Between the lines: Research shows that nutrients from agriculture, lawns and septic tanks fuel red tide blooms close to shore.

• Scientists believe intense runoff from heavy Hurricane Ian rainfall has carried nutrients to feed the lingering bloom, making it explode in size and toxicity.

The latest: The Florida Fish and Wildlife Conservation Commission found Karenia brevis, the organism that causes red tide, in 157 water samples along Florida's west coast, per its most recent report.

• Beach and water businesses are already feeling the impact, with reports of cancellations.

What they're saying: "The legislative session is underway in March and it's time for Florida lawmakers to take action to stop these red tide outbreaks that hurt our environment, tourism and economy," said Jon Paul "J.P." Brooker, director of the Florida Conservation Program at Ocean Conservancy, via email.

What we're watching: The University of South Florida's short-term red tide forecast predicts that the upper water column will move offshore red tide to the east and south over the next few days.

For information on specific beaches:

• FWC's red tide status map, with info on fish kills, respiratory irritation and forecast.
• Visit St. Pete/Clearwater
• Mote Marine Lab's beach report