Karenia brevis - Steidinger

Dead manatees on Sanibel Island, Florida, 1996. (Fish and Wildlife Research Institute (FWRI), Florida Fish and Wildlife Conservation Commission (FWC))

Dead fish from a Karenia brevis bloom in Texas. At high concentrations, toxins produced by this organism can cause massive fish kills. (Brazosports)

A Florida fish kill resulting from the toxic dinoflagellate Karenia brevis. (Fish and Wildlife Research Institute (FWRI), Florida Fish and Wildlife Conservation Commission (FWC)

Swimming manatee (Photo credit unknown)