What is the red tide
The red tide is a natural phenomenon that is characterized by producing a change in the color of seas, lakes, rivers or other bodies of water. This is due to the presence of certain species of marine microalgae. The technical name for this phenomenon is Harmful Algal Bloom (or FAN for short).
The name of red tide is old. But this phenomenon was so designated only when it occurred with red algae.
Nowadays, however, it is used applied to any massive proliferation of microalgae, regardless of its color, which can be green, brown, yellow, orange or even not present any color. An example of this is in the previous image, where you can see a greenish coloration.
Many causes favor the appearance of microalgae that produce red tides. Among them we find the availability of sunlight and nutrients, the absence of winds, high temperatures, or the alterations produced by man in their environment as a result of their activities.
The red tide is potentially toxic for humans as well as for various marine species. This is due to the fact that these microalgae are capable of producing certain toxins (amnesic, paralyzing, gastric, etc.) which, by accumulating in the body of mollusks and crustaceans, make their consumption dangerous.
In this way, the red tide can be the cause of poisoning due to the ingestion of mollusks or crustaceans. It should be noted that it is life threatening. In fact, the toxin produced by these microalgae is the most powerful known.
For this reason, it is inadvisable to eat this type of food before thirty days have passed after the red tide has disappeared.
Red tides can have a disastrous impact not only on fishing, but on all economic activities related to the sea.