Humans primarily see bioluminescence triggered by a physical disturbance, such as waves or a moving boat hull, that gets the animal to show their light off, but often animals light up in response to an attack or in order to attract a mate.
Bioluminescent organisms live throughout the water column, from the surface to the seafloor, from near the coast to the open ocean.
In the deep sea, bioluminescence is extremely common, and because the deep sea is so vast, bioluminescence may be the most common form of communication on the planet!
Source
Bioluminescent organisms live throughout the water column, from the surface to the seafloor, from near the coast to the open ocean.
In the deep sea, bioluminescence is extremely common, and because the deep sea is so vast, bioluminescence may be the most common form of communication on the planet!
Source