To communicate with members of its own species, flashlight fish uses a special type of morse code – oceanbites
Flashlight Fish by unigirl-cloudghost on DeviantArt
Flashlight fishes of the Pacific Ocean, they have two torch-like organs under their eyes which contains bioluminescent bacteria. They can turn this on and off simply by blinking. : r/ThatsInsane
Splitfin Flashlight Fish | Online Learning Center | Aquarium of the Pacific
Flashlight fish glow blue to aid schooling, study from Solomon Islands finds