Red tide, also known as algal bloom, is a phenomenon in which algae reproduce in large numbers in estuaries, seas or freshwater.
Depending on the type of algae, the surrounding seawater will be cloudy or turn pink, purple, red, black or blue.
Red tides are not necessarily red, but can also form many different colors (blue, black, pink, orange...). In particular, they are not related to tidal movements but are a form of algal bloom.
Natural red tides are algal blooms and are not related to tidal activity.
Causes of red tide
There are many causes of red tides. Here are the basic reasons:
How long do red tides last?
Red tides can last for several weeks or even longer than a year.
Red tides are caused by algal blooms and are highly dependent on physical and biological conditions such as sunlight, nutrients and salinity, as well as the speed and direction of wind and currents. The phenomenon may subside and then reappear.
Red tides usually occur close to shore, but can occur 10-40 miles (16-64 km) offshore.
The harmful effects of red tide
The appearance of red tides is a sign of abnormality that can greatly affect the lives of humans, animals and plants globally.
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