Harmful Algal Blooms

Harmful Algal Blooms, or HABs, are large accumulations of toxic algae in marine and freshwater environments. They are caused by certain species of algae, such as Karenia brevis, that produce powerful neurotoxins causing mechanical damage and death.

Karenia brevis causes HABs along the Gulf Coast, frequently blooming along Florida coastal waters. It is a cause of red tide, causing the water to take on a reddish color when it is in high concentrations. Karenia brevis and other harmful species of algae cost the U.S. $75 million a year.

One way humans can help to prevent HABs is by not dumping waste into water. Dumping waste into the water makes it too rich in certain nutrients, increasing algal blooms.