A toxic red tide is threatening tourism and endangered manatees as it has now spread along the Florida coast.

Karenia brevis, microscopic algae, can kill fish and marine mammals, pollute sea food and turn the water into dark, brown-red color.

The Florida Fish and Wildlife Conservation Commission announced the raised levels of the algae over last week and they have received information about thousands of dead fish and marine organisms. According to the FWC, images from the Optical Oceanography Laboratory at the University of South Florida show a bloom 60 miles wide and 90 miles long.

Beaches are not yet affected by it but respiratory irritation has been reported by boaters from the algae. It can cause skin and eye irritation if someone decides to swim in the water. If the toxins are blown onshore then Coughing, sneezing and watery eyes can happen, according to the Florida Department of Health.

Don Anderson, a senior scientist at the Woods Hole Oceanographic Institution, told NBC News that these types of blooms harm wildlife, people and tourism.

About 273 endangered manatees killed by a 2013 red tide, according to NBC reports. The toxic algae were eaten by the manatees when it got too close to shore and settled on sea grass. If the dolphins eat fish containing high amount of the toxins then they can also be killed. Many dolphins died from a red tide when red tide occurred in 1987 - 1988 and about 740 dolphins were found stranded on the coast, according to the FWC.

"In a couple of years, hopefully we will be able to get it down to individual beaches, so it will have less of an impact on tourism, because it really affects tourism", said Quay Dortch, an algal bloom researcher at the National Oceanographic and Atmospheric Administration (NOAA).

Algal blooms cost the United States $82 million each year, according to the NOAA.

Seafood lovers who like oysters, scallops and clams have to worry about neurotoxic shellfish poisoning, which is not fatal but there are chances of having symptoms like nausea, vomiting and dizziness.