Why do these sharks glow in the dark?

Creatures that dwell hundreds of meters below the ocean’s surface are notoriously strange and alluring, and the lanternshark is no exception. Mysterious fluorescent markings, called lateral photophores, flank both sides of the small, slender shark’s body, glowing vibrantly in waters that are otherwise black (pictured). Deep-sea researchers have struggled to understand why these markings exist; they don’t lure prey, they’re certainly not helpful for camouflage, and they don’t warn predators to stay away. So what are they for? Finding a mate... It can’t be easy attracting a partner in the dark; males and females glow from different parts of their bodies and scientists think that this helps them locate a mate. 
- Maybe they have got reflective skins ?-  :) :) :) Maybe...