Jellies beach party !i
An amazing spectacle was seen in Japan.
Surf washed up on shore thousands of jellyfish that normally live at great depths, and only during the breeding are lifted to the surface.
How and why do jellyfish «light up» ?
Many types of jellies can produce light, known as bioluminescence. This process is a chemical reaction that produces a blue-colored light when one type of chemical (known as luciferin) is oxidized by the action of another chemical (luciferinase). In jellies these are combined to form a photoprotein. Some hydrozoan jellies also possess another protein known as green fluorescent protein, which takes the blue light and shifts it to a green color. Light production typically happens after a jelly is touched, perhaps by a predator seeking a meal. Not all parts of a bioluminescent jelly have these light producing substances.
There are lots of reasons for marine organisms to produce light. Since jellies don’t have vision they don’t produce light as a way to recognize each other like some fish. Instead it probably helps to scare away predators that might try to eat a jellyfish. If a fish, for example, tries to eat a jellyfish which lights up when attacked, the fish may be startled and swim away. Also, since it is completely dark where deep-water jellyfish live, producing light when under attack by a fish or some other predator may result in the attacker being visible to other nearby potential predators. Just imagine trying to pick up something that lights up in the dark when you touch it. Your presence will be advertised to anyone else in the area, which is not a good thing if you want to hide.
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