Describe at least 3 functions of bioluminescence in deep-sea fishes.

Deep-sea fishes use bioluminescence for a variety of purposes. Some fishes that live in the mesopelagic realm may use bioluminescence as a means of countershading in order to prevent predation or to hide from prey. In dark waters, bright, sudden flashes of light may be used to startle predators and prey. Light may also be used as a means of attracting prey, as in the deep-sea angler fishes that use a light organ as a lure. Light organs may be useful in attracting mates in the dark deep sea where mates are few and far between. In this regard, producing light in a special pattern on one's body can be useful in species-specific identification as a means of discriminating between potential mates or finding members of one's own species for schooling purposes.