One of the features of the habitat of deep-sea fish is the almost complete absence of light. Only blue and green color spectra penetrate here, to a depth of several kilometers. Recent studies by scientists have shown that fish at great depths begin to glow, transforming blue-green color into red.
The nature of color pigments is based on the absorption of some part of the light spectrum and reflection of the rest of it. For example, a yellow flower absorbs blue, green, and red and reflects the yellow that we see.
Fluorescence, however, has its own characteristics. Molecules responsible for absorbing a specific wavelength of light convert it to a longer wavelength. Many marine animals have colors that can only be seen with special filters.
So researchers of fluorescent corals believe that their rich color combinations help to minimize the harmful effects of sunlight. Another theory is that fluorescence gives marine animals a lot of freedom to choose their color, which is very important for networking and for creating natural camouflage.