Florida has an algae problem, and it’s big. This year, an overgrowth in the waters off the state’s southwestern coast is killing wildlife and making some beaches noxious.

The toxic algal bloom, known as a red tide, is not unusual. Red tides appear off the state’s coast almost every year. But this one, still going strong after roughly nine months, is the longest since 2006, when blooms that originated in 2004 finally abated after 17 months.

The blooms can poison marine animals like sea turtles and manatees, while waves and ocean spray can carry toxins into the air and cause respiratory problems in people.

They can also hit the local tourism industry hard.

“We’re all being really devastated,” said Rachel Wells, 24, who manages an ecotourism business in Englewood, Fla., that runs catamaran tours in the Gulf of Mexico. “Business is just being hurt because we can’t conscientiously suggest for our guests to come out.”