Anglerfish, also known as squid, generally live in tropical and subtropical deep-sea waters, is a teleost fish, squid, squid family, is a world fish, the Atlantic, Pacific and Indian Oceans are distributed.
Above the head there is a fleshy protrusion, shaped like a small lantern, formed by the gradual upward extension of the first dorsal fin of the squid. The reason why the small lantern emits light is because it has glandular cells in the lantern that can secrete photons, which emit light by slow chemical oxidation with oxygen under the catalysis of photonase. Many fish in the deep sea have phototropism, so the small lantern becomes a weapon for the trout to lure food.
When the prey approaches its "little lantern", the trout expands its "blood basin mouth" at a very fast speed and eats it. Of course, in the mysterious deep-sea world, the trout also has its own natural enemies, so its small lanterns will also attract predators for it. But the trout seems to be able to distinguish whether it is the prey or the predator that is close to the small lantern, and if it is a predator, it will quickly take the small lantern into its mouth and hide the light source, thus making the predator lose its direction.
The male of the squid is the real "dick" in the animal kingdom, and from birth, the male anglerfish is labeled "useless". They are petite, very weak, and have little independent predatory ability. The male's only mission is to bite the female's body and parasitize the female, and its body involuntarily releases an enzyme that slowly merges the male's teeth into the female's skin. After that, its internal organs also slowly merged into the female fish, and the two anglerfish slowly merged into one. Eventually, the male fish transformed into a small pimple on the female's body, leaving only a pair of its testicles in case the female fish automatically fertilized when she ovulated. That is to say, when the male and the female mate, the male has been dead for a long time, and the only use of the male's short life is to reproduce.