A discoloration of seawater caused by a bloom of toxic red dinoflagellates.
- ‘Commonly known as red tides, harmful algae blooms choke shallow waters and narrow inlets, and kill tens of thousands of fish annually.’
- ‘But 96 were believed to be caused by red tide, a toxic bloom of algae in the water.’
- ‘It is possible that red tides don't occur during turbulent conditions because the turbulence prevents dinoflagellate populations from growing.’
- ‘On recent red tides that have been plaguing Victoria Harbour, the secretary said the cause was unknown.’
- ‘Scientists studying red tides previously believed that after an algal bloom, high concentrations of brevetoxins didn't last long in the marine environment.’