There is an animal like a cucumber at the bottom of the sea rich in algae. They are covered with brown or light green coats and have many prominent thorns. This is the "ginseng" in the sea-sea cucumber. Sea cucumber is a rare sea treasure among echinoderms. There are more than 20 kinds of edible sea cucumbers in China Sea, some of which are expensive, such as Stichopus japonicus, Mume, Pleurotus ostreatus and so on.

On the coast of Shandong Peninsula and Liaodong Peninsula in China, there is a kind of sea cucumber called Stichopus japonicus, whose back is covered with large and small conical spines, and it is at the bottom of a rock reef or fine sediment with a depth of 3 meters-15 meters in a calm bay. Stichopus japonicus is one of the most valuable sea cucumbers. It is very afraid of heat. Whenever summer comes and the sea temperature rises, it crawls into the deep water, crouches near the reef, does not eat or move, and begins to "sleep in the summer". It didn't move until the Mid-Autumn Festival. It will take more than three months to sleep! When the air is crisp in autumn and the water temperature is getting cold, Stichopus japonicus crawls into the shallow water area, grabs the organic-rich sediments on the seabed with dendritic tentacles while climbing, and swallows them. The organic matter trapped in the sediment is digested and absorbed, and the undigested sediment is excreted. It is the feces of sea cucumbers that provide clues for divers to catch sea cucumbers.

Sea cucumber is not only delicious on the table, but also a nutritional tonic, which is very important for strengthening physical fitness.

Has good effects of preventing diseases, resisting tumors and prolonging life.

Swimmer-Parker

The first time you dive, the most likely fish to see is barracuda. Barracuda has razor-like teeth and a spindle-shaped body, and often swims around in the boat, waiting for feeding.

Barracuda often moves in groups when it is young, and moves alone when it grows up. The largest barracuda can reach 180 cm, and the teeth can reach 2.5 cm.

Barracuda's curiosity often brings them close to divers, but they have no precedent for attacking divers.

Black thief

There is an animal in the sea that spits ink called squid. Because it can spit ink, it is also called cuttlefish.

Squid can not only swim in the sea for a long time like fish, but also swim very fast. Some people call it a "rocket in the sea", and the metaphor is very appropriate.

There are eight feet (divided into four pairs) arranged radially in front of the squid head and around the mouth. Squid's feet grow on the top of the head, so we call this animal cephalopod.

The meat of squid is very delicious. Its meat contains a lot of protein, which is very nutritious, so it has become our good food like fish and other shellfish. Many squid are caught in the coastal areas of China every year. It is one of the products of China's four seas (the products of China's four seas are large yellow croaker, small yellow croaker, hairtail and squid). Especially in the coastal areas of Zhejiang, the production of squid occupies a very important position. Squid can be eaten raw or dried.

Yu Zhang

Like squid, octopus is a cephalopod.

Because its feet are also born on the top of the head. But there are only eight of them.

Feet, and there is no special touch foot for catching squid and other foods. Its eight feet are very long, like eight belts, so fishermen call it "octopus".

Octopus is also a fierce animal. There is a big suction cup on the foot. If we catch a small octopus and hold it in our hand, it will immediately suck our hand with a sucker, and it will be very difficult to take it off!

Octopus also has ink sacs, and the ink contained in them also contains toxins, which not only

Can be used to defend the enemy, can also be used to attack the enemy. An interesting fact is that,

Octopus doesn't all rest together when resting, but has one or two long legs.

Ben, keep turning. Although its body and other feet are insensitive,

If it gently touches its duty foot, the octopus will jump up immediately and release a thick

Mo, hide yourself.

Octopus is in the sea because it has powerful feet, sucker and good defense tools.

Animals of the same size in the ocean will be hurt by it. Even the largest and best equipped

Although crayfish is similar in size to octopus, it will inevitably become its victim.

The octopus is very thick and is also an excellent seafood.

Glowing fish

In the ocean world, in the vast sea surface and the bottom of the 10,000-meter abyss, there are all kinds of strange luminous creatures, just like a wonderful "underwater dragon official", with fish lights and shrimp lights burning all night. 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 have rows of luminous bodies on their abdomen and ventral side, just like rows of candles. Therefore, this bald fish named Candlelight Fish has a flat back and is covered by a pair of huge luminous bodies, which may have played 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 cheek 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.

Free travel- fish

? Above the fish's head is an oval sucker, which is often adsorbed on the abdomen of whales, dolphins and sharks, and sometimes sucked away.

Roaming the world for free under the boat. ? Using this stunt, fish can not only avoid the enemy's attack, but also eat the leftovers of big fish and marine animals, as well as the food left by people on board. So people call it a "free traveler".