Red tides, which are massive algal blooms, can block sunlight from reaching the sea floor and release toxins into the water and air.
Toxic red tide is making Floridians sick — and angry
Human link to Red Tide highlights need for better water monitoring
Dead fish, birds, manatees, even a whale shark -- The worst Red
Low levels of red tide found off Broward County, but high levels
Red tide algae blooms no longer present near Texas City Dike
USF study: Water from deep in gulf may keep away red tide
Climate change raises pollution risks for Florida's fertilizer
Florida Manatee Feeding Program Winds Down
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Study Links Red Tide and Dead Zones off West Coast of Florida
Red tide endangers marine life in Persian Gulf - Ocean Sentry