Recently, the Monterey Bay Aquarium Research Institute in California, USA, photographed a rare tube-eye fish with a transparent head and tube-shaped eyes during a deep-sea observation mission.
In the video, you can clearly see two green orb-like eyes wrapped in transparent tissue on the head, which look very strange.
It is understood that the tube-eye fish is a deep-sea fish adapted to the dark environment of the seabed. It usually lives in the deep sea at about 600 meters to 800 meters, and it is difficult for sunlight to shine in. They use their very sensitive tube-like eyes to search for prey targets that are vaguely outlined above their heads.
Its eyes look upward most of the time, and the green pigment in its eyes is said to filter out sunlight directly from the sea, helping it spot jellyfish and other glowing creatures directly above it. When it spots prey, it rotates its eyes forward and swims upward, entering hunting mode.
This fish has only been discovered nine times so far. The first time it was discovered was in 1939. Biologists know that the special eye structure of this fish can collect light well, but the tube-shaped eyes cause them to have a narrow field of vision.