In the near future, the fishing nets used by people for generations will be replaced by powerful water absorption devices. Using the light emitted by electric field, sound with certain frequency and special compounds dissolved in water, fish can be lured and forced to gather together and swim close to the suction pipe laid down on board, and the suction pipe will be sucked into the cabin together with the fish carrying water. By that time, people will get more than 654.38 billion tons of seafood from the ocean, ten times or even dozens of times more than what they get from the ocean now.
With the increasing demand for oil, natural gas and other resources in the world and the massive exploitation of these resources, these resources on land will be exhausted day by day. People will inevitably look to the ocean or look for new energy sources. It is estimated that the seabed oil reserves are about 90 billion tons, and the oil reserves in the Arctic Ocean alone can be used by the world for 50 years. At present, more than 100 countries and regions have explored and developed continental shelf and deep-sea oil, and more than 500 oil and gas fields have been discovered. The implementation of a ten-year world offshore drilling plan is coming to an end. Explore and develop submarine oil and build a production base on the seabed. For the transportation problem after submarine oil exploitation, people will use large submarines. Imagine sinking a huge plastic cylinder into the bottom of the sea, which is filled with 654.38+10,000 tons of crude oil and towed by a submarine. Some people also designed to transport it by spaceship.
There is a huge amount of energy in the ocean, which is called the "blue ocean of coal" and will be transformed into the future energy of mankind. In the future, the marine thermal energy conversion plant will be located in the sea, and electricity can be supplied to cities through coastal cables. The content of heavy water in seawater called "future fuel" is much higher than that in land water. Hydrogen isotope can be extracted from heavy water, and scientists are using it for thermonuclear reaction experiments. If successful, it will become an inexhaustible source of energy.
In the near future, people will also build "underwater cities", which is not an illusion, but a reality. At present, Japan has built a "small city" for Arab countries to swim at sea. Most of it is made of steel, and the center is a six-story building. There is a small indoor garden, a cinema, and all the water and electricity are self-provided. Can meet the needs of cultural and recreational life of offshore oil production workers. The floating city is supported by eight tall pillars. Put them away and you can sail like a boat. In the future, many offshore factories will be built in the sea near raw material production sites or markets to provide materials for urban residents at sea. In Longchuan Bay, southwest of Shikoku Island, Japan, there is a "park in the sea". People can enjoy the wonders of the seabed through the 60 cm diameter 16 glass window: grotesque rocks, colorful corals, all kinds of strange fish, strange starfish and anemones. Since the first underwater laboratory was built in the United States, many countries have followed suit and built "steel houses" and other buildings on the seabed. The air pressure in the "house" is the same as the sea surface, and people can work normally in it, repair oil and gas wells on the seabed, salvage sunken ships, explore the seabed or replenish submarines. It is also reported that a group of Japanese engineers and architects. It is planned to build the world's first "marine city" in the sea area from Tokyo 120km to solve the human settlement problem in the future. Ocean City will be built on the seabed 200 meters deep, with a four-story steel platform, about 70 meters away from the sea surface, covering an area of 23 square kilometers. The whole city will be supported by 65,438+00,000 solid columns, and induction devices will be installed near the columns. We can measure typhoons, tsunamis and undercurrents, adjust ourselves to resist these external pressures and maintain the stability of Ocean City. In addition to residential areas, Ocean City also has a commercial center, 400 tennis courts, 8 golf courses, 2 baseball fields, 1 artificial fields for growing fruits and vegetables, and roads connecting vertically and horizontally. The construction cost of Ocean City is estimated to be 200 billion dollars, and this huge project is expected to be completed by the end of this century. By 2 1 century, this "undersea city" will be inhabited by more than 1 10,000 people. At that time, the deep seabed will no longer be silent, and it will become as lively as the mainland. More and more people will explore it, build it and paint this grand blueprint with their own wisdom and hands.
The future of the ocean shows people brilliant prospects, and the vast ocean will make great contributions to mankind.
2. How to write a composition about arowana (more than 100 words) Arowana (Latin name: Scleropages formosus, English name: Dragon fish) is a red subspecies of beautiful bony fish tongue fish (other subspecies include arowana and arowana, all of which belong to beautiful bony fish tongue fish).
There are four kinds of subdivision: orange, pink, crimson and blood red, among which blood red is the most beautiful and precious, and the number is very small. Due to the influence of loong culture, arowana has become the embodiment of auspiciousness, which means auspiciousness is transported into treasure, so it is called Feng Shui fish.
The reproductive ability of arowana is weak, and it is very strange that females lay eggs and males hatch and feed in their mouths. Because of its two beards, shiny scales and ancient life experiences, people naturally associate it with the mysterious dragon and call it "arowana".
Arowana is regarded as a sacred fish in Southeast Asia, Hong Kong, Macao and Taiwan, and places where overseas Chinese are concentrated. It can be raised as a feng shui fish in Wang Jiazhen, especially arowana, which was listed as a class A protected animal by the Washington Wildlife Protection Treaty in 1980. In Hongkong, Macau and Taiwan Province, the price of one-stop fish is more than one million yuan, which is regarded as a symbol of family wealth and status.
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3. Morphological characteristics of deep-sea arowana The black giant mouth fish, also known as "deep-sea arowana", belongs to the order of giant mouth fish. Although this fish is small in size, it is a fierce predator.
It has a big head, armed with a large number of long and sharp fangs, and uses a luminous device as bait.
Deep-sea arowana lives at the bottom of 1524 meters. There, the visible light from the sky has been absorbed by the middle zone, and the deep zone has formed an extremely dark environment. In this environment, the eyes of the black giant mouth fish are specialized into a tube, and the photoreceptor cells are densely covered under the large crystal.
What about the deep sea? ? ? ? Similarly, it has a big head, equipped with many long and sharp fangs, and what about the deep sea? ? ? ? Similarly, it also has a luminous bait, the only difference is that its luminous device is not on the back of the head, but on the jaw.
What about the deep sea? ? ? ? Similarly, it is constantly flashing, swinging back and forth to lure prey, and when the prey approaches, it holds on with sharp teeth. There are also two rows of luminous bodies on both sides of the giant mouth fish, which can send signals to other giant mouth fish during mating, and can also imitate the sparkling sea surface, thus misleading predatory fish in the depths below. The biggest difference between black giant mouth fish and other kinds of giant mouth fish is that they have a pair of luminous bodies under their eyes, which can serve as searchlights when searching for prey in the deep sea.
4. Composition of the seabed The water in Tianmu Lake is crystal clear.
The mountains of Tianmu Lake stand tall. It is said that the name of Tianmu Lake comes from this: the mountains of Tianmu Lake and Tianmu Mountain are the same style.
The water in Tianmu Lake is as clear as that in Qiandao Lake. So it's called Tianmu Lake.
The underwater world of Tianmu Lake is particularly eye-catching. There are many fish in it that I have never seen or heard of.
The first thing that caught my eye was the fish with yellow head and gray tail. The most lovely thing is that it twists and turns when swimming, so beautiful that I can't help but exclaim "Wow".
There is also a shark that dominates the "boss" in the ocean here, but the shark here is not the fierce shark we saw on TV, but a lovely little shark that won't eat people. I feel very attached to it when I look at it. Slowly, I watched it swimming in the water, and I couldn't help laughing.
And ... "Wow" Here are some chinemys reevesii, people are coming. These turtles crawl in the water.
I thought to myself silently: How many years will such a big turtle be kept? In the past, there was a small shop full of decorations made of things from the sea, such as shells, seashells and conchs, which were welcomed by many of us. There are lovely dolls, all kinds of decorations, beautiful wind chimes ... The idiom "cheap and good" is vividly reflected here.
5. In the third grade of primary school, write a composition of hexagonal arowana with 30,000 words.
This name is very strange. You may think it looks terrible and scary.
But its real name is not "hexagonal dinosaur", but "hexagonal dinosaur fish". Although it looks scary on the surface, it is actually timid and naturally cute. They come from freshwater lakes in Mexico. Now, this kind of fish is rare in the wild, because they have been captured by humans. It is said that the "Hexagonal Dinosaur" artificially raised now is sensitive, cute, timid and not easy to hurt people. If the artificial breeding is good, it is generally not a problem to live for eight to ten years. It eats bread worms, turtle food, pork and so on.
I remember that I just bought a hexagonal dinosaur fish that day. When my father saw it, he suddenly went into a rage and asked a series of questions: "What happened at this time? This thing is terrible! What does it eat? Can you bite? Is he a lizard? " I pretended to listen. In fact, I have been concentrating on observing the hexagonal dinosaur fish for some time, and suddenly I found this fish so beautiful! Beauty is bright red on its horns, like six precious and beautiful corals. At the same time, its eyes are beautiful, black, like two black pearls. It has four legs, thin and short. Do not underestimate them. Oh, when hexagonal dinosaur fish swim, they can help a lot!
6. Composition about the Death of Arowana Last time I bought Arowana, after it was pecked by a money fish, my father learned a lesson, bought a new fish tank, and bought an imported Arowana to raise it alone.
Arowana looks noble and lovely. This fish is 25 cm long, and its triangular head is inlaid with a pair of marble eyes. Under the eyes is Zhang greatly's mouth, which yawns like a child when opened. There are a pair of short and sharp tentacles in front of the mouth. His scales glistened with golden light, and he looked majestic, like a general in armor; The pectoral fin is red, big and long, and the curvature is very beautiful when turning; The red dorsal fin is like a flag; The tail fin is also red, like an oval fan. There seems to be a heroic spirit when the tail is tilted up, and there is a kind of arrogance in the eyes, which makes you feel like a king. Arowana tastes interesting. It likes to eat fish, shrimp, insects and live animals. Dad bought them highland barley worms, went to Fangshan Reservoir to catch some small fish and shrimp, and put them in vats for arowana to eat at any time. Arowana is very vigilant when eating. Dad feeds it with worms, and it is not in a hurry to eat. First, it backs off and stares at the bug to make sure there is no danger. When it is safe to use, it will immediately go forward and swallow the worm in one gulp. When I am full, my tail will swing, and I sometimes stretch and yawn. Go to see it as soon as you have time and feed some small fish and shrimp. Arowana seems to like me, too, and often swims in front of me and wags its tail. I'm always fascinated by it. I can't get enough of it.
Arowana is noble and lovely. I like its shiny scales and its elegant and smooth swimming.
7. The environmental photosynthesis area of deep-sea arowana is full of sunshine and the food is the most abundant. However, some crustaceans and copepods, which mainly feed on phytoplankton, dive into water hundreds of meters deep during the day, then migrate to the surface for food at night when it is safer, and then return to deeper waters at dawn. Some deep-sea fish also migrate day and night to prey on copepods, and further, other large carnivorous fish follow closely, thus triggering large-scale animal migration activities. This behavior can increase the material exchange between the surface layer and the deep layer. Giant mouth fish is one of the fish that participate in this vertical migration day and night, so it is called deep-sea arowana.
8. I am anxious about the composition of "Xiaolong". Hello, everyone. Do you still know me? I am very happy these days, haha, just because I am the focus of the world now, I am also a hero of our country. You guessed it, haha, I am the "Jilong" that just dived to a depth of 5057 meters. Don't open your mouth so wide. Do you really want to know me? Let me tell you something about my experience.
The reason why I can dive into such a deep sea is because of my shape design. I am like a great white shark, with a round white body, an orange head and an X-shaped stabilizing wing behind me. I am more than 8 meters long and 3 meters wide, and I have seven propellers. I am made of the strongest special glass bead material, which can withstand water pressure and keep balance.
On July 26th, I picked up three scientists and started my diving career. Before I started, the scientists gave me a careful examination and told me that they trusted me and I trusted them. You know, these three scientists are the real dragons. The country's selection of them is stricter than that of astronauts, and their level is naturally leveraged. This time, my goal is to dive to the deep sea below 5000 meters.
The sea over 200 meters is blue and beautiful. Sunlight refracts into the sea, making beautiful ripples, colorful small fish and grotesque underwater creatures swimming around. But at 200 meters, the light can't penetrate the water layer, so it is dark. I have to rely on the sonar system to know where there are fish, pits and obstacles to avoid. At this time, I found a mouse in the deep sea. I'm surprised that rats can survive in deep water? I didn't realize it was really strange until scientists said it was a kind of rat-tailed cod. There is also a fish with a tail like a mouse. How does it keep its balance when swimming? I was thinking about it when I suddenly felt a pain. When I looked at the instrument, it had dropped to 4000 meters. According to scientists' calculations, there are 4,000 tons of pressure on the seabed with a square meter of 4,000 meters, which is equivalent to a little finger cover carrying 800 kilograms of goods. But don't worry about me, I can survive.
When I crossed the 5000-meter deep sea, the scientists also embraced excitedly and danced happily. Because of my dive, China has become the third country with the deepest dive in the world, which means that the level of manned deep dive in China has reached the advanced level in the world.
After the development of science and technology, we must dive to 7000 meters next time. Please wait for my good news!