Red tides are also known as algal blooms
- sudden influxes of massive amounts of colored single-cell algae
that can convert entire areas of an ocean or beach into a blood red color.
While some of these can be relatively harmless,
others can be harbingers of deadly toxins
that cause the deaths of fish, birds and marine mammals.
In some cases, even humans have been harmed by red tides
though no human exposure are known to have been fatal.
While they can be fatal, the constituent phytoplankton in ride tides are not harmful in small numbers.
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