What kind of energy does the angler deep sea fish use? and how does it work?

Question

the fish is a nasty looking one with an antenna hanging over its forehead with a light-bulb on it. I am curious how it can make light underneath the water. It must use some sort of energy. I am curious and am wondering if its possible to get energy from just water and stuff fish live on. If thats possible maybe we can sort of copy them somehow. If possible I will try to do something about it.

Answer 1

The lures of the female deep sea anglerfish (male anglerfish have no luminous organs) is much more elaborate than the lure of the shallow water species and in addition bioluminescence is used to attract the prey in the dark. The lures are modified dorsal fins and contain luminous bacteria which produce a bluish, greenish light. The light and movement of the lure attract the prey to within reach of the gaping jaws. The anglerfish Cryptopsaras can slide the rod part of the apparatus back into a groove, drawing the lure and prey closer to the mouth. It can rotate the lure tip and produce a flash from it as well as a glow. All this is controlled by enzymes and the contraction of chromatophores.