The “invisibility cloak” of deep-sea fish

  In the depths of the dark ocean, the fishes living there have no hiding place. Even in places out of the sun, they may still be caught by glowing predators. But recently, scientists have discovered that some fish have evolved new skills-using black “invisibility cloaks” to avoid natural enemies.
  Scientists collected 39 black-body fish from the 1.6-kilometer deep sea in the Monterey Bay and the Gulf of Mexico for research. They found that at least 16 deep-sea fish have evolved ultra-black skin and absorbed more than 99.5% of the radiation. The light on them makes their body color 20 times darker than the color of common black objects. Among them, the blackest is a miniature anglerfish, whose body color can absorb almost all light, which can be “stealth”. The “stealth” ability of this super black fish is so powerful that only the bird of paradise of Papua New Guinea with super black feathers can compare with it.
  Scientists observed through a microscope that the melanin in the skin of ordinary black fish was like tiny pearls with a certain gap between the melanin, while the melanin of super black fish was in the shape of a “well”, and the melanin was tightly arranged to form a piece of skin covering their body Melanin film. Scientists used computers to simulate fish skins with melanin in different shapes and sizes. Through comparison, scientists found that the shape and arrangement pattern of melanin in the skin of super black fish have the strongest light-absorbing ability. The “stealth” ability of super black fish is 6 times that of ordinary black fish. This “stealth” ability makes the super black fish neither easy to be found by prey nor by natural enemies, which is a survival advantage for them.
  This research may inspire scientists to study new light-harvesting materials.