"Devil fish" like to swim in groups, sometimes they dive on the bottom of the sea, and sometimes they rise to the surface in pairs. In the breeding season, manta rays sometimes beat the water with their double fins and leap into the air. It can jump out of the water and "glide" over the water. When falling into the water, the sound is like a cannon, which spreads for miles and is very spectacular.
Manta rays look daunting, but in fact they are very gentle and only feed on crustaceans or groups of small fish and shrimp. There are two fleshy feet on its head, and these are its head fins. The head fin is turned over and protrudes forward, and can rotate freely. Manta rays use this pair of head fins to drive away food and swallow it in their mouths.
Fish that can generate electricity and emit radio waves In the fish kingdom, there is a kind of fish that can generate electricity and emit radio waves. Their methods of hunting and defending the enemy are very ingenious.
There is a torpedo that can generate electricity in the vast ocean, and its generator is mutated from gill muscles. There is an oval honeycomb generator at the back of the torpedo's head and the inside and left and right of the pectoral fin on the shoulder. The most basic structure of each power generating organ is small plates-electric plates (fibrous tissue), and about 40 electric plates are overlapped up and down to form hexagonal columnar tubes with 600 tubes on each side, which are called electric function tubes. The electric function tube is filled with colloid, so it is translucent and milky white with naked eyes, which is obviously different from the surrounding pink muscles. One side of each plate with nerve endings is a negative electrode and the other side is a positive electrode. The current direction is from the abdomen to the back, and the discharge amount is 70 volts to 80 volts, sometimes reaching 100 volts, and the discharge is 150 times per second. When people dissect the torpedo, they find that there are complete eels, flounders and salmon in their stomachs. This is because the torpedo discharges the fish with strong activity and then swallows them. Therefore, the torpedo is known as the "underwater electric shock hand".
In addition to torpedo, Raya spinosa, Ray Star, Ray Ho and Ray China have weak power generation organs.
Most people think that fish are all dumb, which is obviously wrong. Many fish make all kinds of amazing sounds. For example, Kangji eel will make a "bark" sound; The sound of electric catfish is like a cat's anger; Box bream can make dog barks; The cry of the cockroach is sometimes like a pig, sometimes like a groan, and sometimes like a snore; The hippocampus will make a monotonous sound like a drum. Stonehead fish are famous for their good calls, such as rolling, drumming, flying of hummingbirds, meowing of cats and whistling. Their calls are particularly common during reproduction, aiming at clustering.
Most of the sounds made by fish are caused by bone friction and contraction of swim bladder, and some are by breathing or anal exhaust. Experienced fishermen can judge the number of fish according to the sound they make, so as to catch fish in the net.
Mandarin ducks in the sea-butterfly fish will be full of praise when people see butterflies flying on the land, and the reputation of butterfly fish is because it is similar to beautiful butterflies. If people want to choose beauty among coral reef fish, then the butterfly fish is the most colorful and thought-provoking one.
Butterfly fish, commonly known as tropical fish, is a small warm-water coral reef fish offshore, the largest of which can exceed 30 cm, such as butterfly fish with fine lines. Butterfly fish have a flat body and are suitable for shuttling back and forth among corals. They can quickly and quickly disappear into coral branches or cracks in rocks. Butterfly fish has a long snout and a small mouth, which is suitable for reaching into coral caves to catch invertebrates.
Butterfly fish live in colorful coral reefs and have a series of skills to adapt to the environment. The gorgeous body color of butterfly fish can change with the change of surrounding environment. There are a large number of pigment cells on the body surface of butterfly fish. Under the control of nervous system, pigment cells can expand or contract, thus making the body surface appear different colors. Usually it takes a few minutes for a butterfly fish to change its body color once, while some only take a few seconds.
Many butterfly fish have very clever camouflage. They often hide their real eyes in black stripes that pass through their heads, and leave a very striking false eye at the tail handle or behind the dorsal fin, which often confuses predators by mistaking it for their heads. When the enemy attacked its false eye, the butterfly fish flapped its fins and ran away.
Butterfly fish are loyal to love, and most of them are in pairs, like terrestrial mandarin ducks. They swim and play in coral reefs in pairs and are always inseparable. When one butterfly fish feeds, the other one is on the alert around it. Butterfly fish is favored by ornamental fish lovers in China because of its bright body color. They are kept in large numbers in aquariums around the coast.
Glowing Fish In the ocean world, there are all kinds of bizarre luminous creatures living on the vast sea surface and the bottom of the abyss. The sea world is like a wonderful underwater dragon palace, with fish lights and shrimps burning brightly all night. It is these luminous creatures that bring light to the deep sea without sunshine and the sea covered by night. In fact, at least 44% of fish in the dark layer have their own luminous ability, so that they can see other objects in the long night, which is convenient for predation and looking for companions and spouses. Some fish (such as hairtail and dragon head fish in the southeast coast of China) emit light from luminescent bacteria attached to their bodies, while more fish emit light from their own luminous organs.
Candlelight fish has rows of light emitters 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 large light emitters, which may play a visual role.
Fish luminescence is a biochemical reaction caused by the catalysis of a special enzyme. Luminous fluorescein is catalyzed by luciferase, which absorbs energy and becomes oxidized fluorescein, releasing photons and emitting light. This is a special example of chemiluminescence, that is, it only emits light without heating. Some fish can emit white light and blue light, others can emit red, yellow, green and ghostly light, and still others can emit several different colors of light at the same time. For example, a fish in the deep sea has a large luminous cheek organ, which can emit blue light and pale red light, while other tiny luminous spots all over the body emit yellow light.
There are four biological significance of fish luminescence: first, trapping food; second, attracting the opposite sex; third, population contact; fourth, confusing the enemy.
The mola fish with a strange shape looks very strange. Its body is short and flat, its dorsal fin and anal fin are relatively high, and its caudal fin is short, which looks as if it had been cut off by a knife. Therefore, its common name is also called head fish.
Molas swim slowly. It lives in the tropical sea, and many luminous animals are often attached around its body. As soon as it swims, the luminous animals on it will emit bright light, which looks like a bright moon from a distance, so it is also known as the "moon fish". Sunfish, a top-heavy body, is very suitable for diving. It often dives into the deep sea to catch deep-sea fish and shrimp for food.
Molas are clumsy and not good at swimming, and are often eaten by other fish and sea animals in the ocean. The reason why it is not extinct is its powerful fertility. A female fish can lay 300 million eggs at a time, and it can be called "the most fertile mother fish" in the ocean.
Molas are found all over the world, and there are three kinds of molas along the coast of China, namely, molas, molas with yellow tails and molas with spear tails.