1, Ankang fish, also known as toad fish, old fish, ugly girl, etc. Fish, Anchopoda, Anchoraceae. 2. The body of Ankang fish is soft and scaleless, and there are many cortical processes on the head and body edge. The front half of the body is flat, disc-shaped and the tail is small. Body length is more than 50 cm. The back is purple-brown, and the abdomen is light. Big head, wide mouth, sharp teeth, black and white stripes in the mouth. The pectoral fin is wide and arm-shaped. The first three spines of dorsal fin are separated, and there is a flap (also called cortical spine) at the top of the first spine. There are some luminous bacteria in the flap. Kangan fish has a big mouth, canine teeth and a fishing rod on its head. This fishing rod will glow from time to time to lure small fish. It is like a fishing rod with a bright lamp. Ankang is a fish near the bottom of the sea and often lurks. The flap of the first spine of dorsal fin is used as bait to trap those phototropic fish and shrimp. Ankang fish basically eats, and delicious food is always delivered to its mouth. 3. Ankang fish caught at sea are generally female fish, and generally male fish are not seen. This is because the male fish parasitized on the female fish at a very young age, and most of them have become an organic whole with the female fish, but the body shape of the male fish can still be distinguished by careful observation. It is rare for men and women to be so close in the animal kingdom. However, there are very few men living alone. It is said that the male Ankang caught in Iceland weighs only one thousandth of that of the female Ankang. 4. Ankang fish are distributed in the western part of the North Pacific Ocean and are found in the coastal areas of China. Other varieties of Ankang are Huang Ankang, with yellow-brown back, white mouth and no black spots, which are produced in the northern part of the East China Sea, the Yellow Sea and the Bohai Sea. Because Ankang fish head is large, small, with large organ ratio and low meat yield, it is generally disintegrated rather than frozen as a whole. There are also snapper, dragon head fish, naked eye fish, bald head fish and so on, a lot. Some sharks also glow. The light produced by horn sharks is a strong green phosphorescence, which is emitted by many luminous organs scattered in the skin. There is a kind of shark that can glow for hours after death. Some teleost fish have a more advanced luminous system, and there are several rows of luminous balls on both sides of their bodies. There is a fish with light eyes in the Indian Ocean. Under the eyes, there is a big light-emitting organ growing on a short movable handle, just like a lantern that can be carried around. When not in use, this "lamp" can be taken back and hidden in a bag under the eyes. There is also a kind of lantern fish, which has a small number of luminous organs, but it emits strong light, like dazzling gems and shining pearls, embedded in the abdomen. There are more than 700 luminous spots on the apes living on the coast of California, USA, which emit white light. All kinds of lightfish, different luminous groups and different luminous organs, emit different colors of light. These fish glow because they have luminous cells in their bodies, or luminous cells in the luminous body. There are many glowing fish in the world. This luminous fish can be divided into two categories, one is from light fish, and the other is from light fish. ? The bald fish in America comes from light fish. The back of its head is flat and covered with a pair of big lights, just like a "searchlight". The bald fish has no eyes, and the luminous body can play a visual role. Bald fish has a strange set of predation skills, which people call "strange fishermen". They often hide themselves, open their huge mouths and wait for opportunities. The filaments protruding from the fins slowly swing, and the luminous body at the end of the filaments is like a swimming shrimp. Curious and greedy little fish thought it was a delicious meal and chased it one after another. They were just about to eat, only to find that they had been cheated, and it was too late to get out. Instead, it became a delicious meal for bald fish. ? An American biologist once placed one of the most sensitive photometers 270 meters under the sea at night and found that the brightness of bald fish was much higher than that of white light. The flashing fish in the Red Sea and the Indian Ocean is "Talefish". The flashing fish is only seven or eight centimeters long, and its light is very bright. Divers can see the fish 10 meters underwater. Because the flash of this fish allows divers to see the time on the watch underwater, divers often catch it and put it in a transparent plastic bag for underwater lighting. ? Flash fish, also known as "smooth fish" and "light-eyed fish". It has a dark "eyelid" attached to the bottom of the luminous body, like a light switch, which is pulled up for a while to cover the luminous organ and turn off the light; Then pull it down, revealing the glowing organs, flashing. In fact, this fish does not glow by itself, but by thousands of special bacteria that breed in its head. On the one hand, these bacteria survive by absorbing nutrients and oxygen from fish blood, on the other hand, they emit light energy. So these bacteria can continue to glow even after the death of the flash fish. -In the marine world, there are all kinds of strange luminous creatures living on the boundless sea surface and the bottom of the 10,000-meter abyss. It is they who bring light to the deep sea without sunshine and the sea covered by night. In fact, at least 44% of the fish in the dark layer have their own luminous ability, which enables them to see other objects in the long night, which is convenient for hunting and finding companions and spouses. Some fish can emit light, such as hairtail and dragon head fish in the southeast coast of China, which are emitted by luminescent bacteria attached to their bodies, while more fish are emitted by their own luminous organs. Candlelight fish has rows of luminous bodies on its abdomen and ventral side, just like rows of candles, hence its name. The back of the head of the deep-sea bald fish is flat and covered by a pair of big luminous bodies, which may play a visual role. Fish luminescence is a special biochemical reaction caused by enzyme catalysis. Luminous fluorescein is catalyzed by luciferase, which absorbs energy and becomes oxidized fluorescein, releasing photons and emitting light. This is a special case of chemiluminescence, that is, it only emits light without heating. Some fish can emit white light and blue light, some fish can emit red light, yellow light, green light and ghost light, and some fish can emit several different colors at the same time. For example, a fish in the deep sea has a large luminous oral organ, which can emit blue light and light red light, while other tiny luminous points in the whole body emit yellow light. There are four biological meanings of fish luminescence: one is to trap food; Second, attract the opposite sex; Third, population contact; Fourth, confuse the enemy.