Follow CBSMIAMI.COM: Facebook | Twitter

ST. PETERSBURG (CBSMiami/AP) — A major environmental problem in Florida is growing.

READ MORE: Florida Bar Exam To Be Held Online In July

It appears that a noxious red tide algal bloom has reached one of Florida’s main metropolitan areas.

The Tampa Bay Times reported Sunday that hundreds of thousands of dead fish have been found on and near roughly 20 miles of beaches located in Pinellas County on the Gulf Coast. Pinellas County is in the Tampa Bay area.

READ MORE: Passing Asteroid Lights Up South Florida Sky

County and city crews cleaned up fish that washed up on the shore. A Pinellas County environmental official told the newspaper that she expects the clean-up to run through the weekend and into next week.

Red tide is a natural occurrence that happens due to the presence of nutrients in salt water and an organism called a dinoflagellate. This bloom started in November and has been lingering in southwest Florida for weeks.

MORE NEWS: CDC And FDA Recommend Pausing Johnson & Johnson's COVID-19 Vaccine Over Blood Clot Concerns

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)