1. "Ocean" essay of 800 words (3 articles)

With the advancement of science and technology and the development of the times, a new era of ocean development has arrived. In developing the oceans, people will extract more wealth from them more efficiently. More and more countries are planning to establish or have already established undersea gardens and pastures. People are gradually transitioning from the past era of simple ocean fishing to the future era of "farming the sea". In the not-too-distant future, people will work better and more efficiently in undersea gardens and pastures than in farms and pastures on land, because the unit output of marine aquaculture is higher than that of land cultivation for the same area. 100 times. People will cultivate large quantities of seaweed and seaweed to supply cattle, pigs, sheep, etc. on land as feed, thereby obtaining more protein. The total output of the world's underwater gardens will soon jump from the current 20 million tons to 50 million tons. , a large amount of seaweed, seaweed, etc. will also be harvested by underwater combine harvesters, and then hoisted to the ship by steel cables.

In the near future, the fishing nets that people have used for fishing for generations will be replaced by powerful water-absorbing devices that use light emitted by electric fields, sounds of a certain frequency and special compounds dissolved in the water to lure and The fish are forced to gather together and swim close to the suction pipe placed on the boat. The suction pipe sucks the water and fish into the cabin together. By then, together with the various fish and shrimps provided to humans by seabed pastures, the seafood that people obtain from the ocean will reach more than 1 billion tons, which is more than ten times or even dozens of times more than what is currently demanded from the ocean.

As the world's demand for oil, natural gas and other resources continues to grow and people exploit these resources in large quantities, these resources on land will become increasingly depleted. People are bound to turn their attention to the ocean or find new energy sources. It is estimated that the oil reserves under the sea 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 carried out continental shelf and deep-sea oil exploration and production, and more than 500 oil and gas fields have been discovered. The implementation of a ten-year world ocean edge drilling plan is nearing completion. Explore and exploit seabed oil and build production bases on the seabed. For transportation problems after submarine oil is extracted, large submarines will be used. Imagine sinking a giant plastic cylinder to the bottom of the sea, loading it with 100,000 tons of crude oil, and towing it by a submarine. Some people also design to use spaceships for shipment.

There is huge energy in the ocean, which people call the "blue sea of ??coal", which will be converted into energy for the future of mankind. The future ocean thermal energy conversion plant will be set up in the sea, and cables can be used to supply urban electricity along the coast. Heavy water, known as the "fuel of the future," is also found in much higher amounts in seawater than in land water. Isotopes of hydrogen can be extracted from heavy water, and scientists are using it to conduct thermonuclear reaction experiments. If successful, it will become an inexhaustible energy source.

In the not too distant future, people will build "undersea cities". This is no longer a fantasy, but a reality. At present, Japan has built a "small city" for maritime swimming for Arab countries. It is mostly made of steel and has a 6-story building in the center. It has an indoor small garden, a cinema, and all water and electricity are supplied by itself. It can meet the cultural and entertainment needs of offshore oil production workers. This floating "city" is held up by eight tall pillars. When they are stowed away, they can be used as a boat. In the future, many offshore factories will be built in sea areas near raw material production areas or markets to provide material needs for residents of maritime cities. There is a "Sea Park" in Ryukushi Bay southwest of Shikoku Island in Japan. People can enjoy the wonders of the sea through 16 glass windows with a diameter of 60 cm: strange-shaped reefs, colorful corals, and all kinds of strange and beautiful things. Fish and interesting starfish, sea anemones, etc. Since the United States was the first to build an underwater laboratory, many countries have followed suit and built "steel houses" and other buildings on the seabed. The air pressure inside the "house" is the same as that on the sea surface. People can work normally inside and repair submarine oil and gas. Wells, salvaging sunken ships, seabed exploration or supplying submarines, etc. It is also reported that a group of Japanese engineers and architects. It is planned to build the world's first "Ocean City" on the sea 120 kilometers away from Tokyo to solve the problem of human settlement in the future. Ocean City will be built on the seabed 200 meters deep. It will have a 4-story steel platform, about 70 meters above the sea, covering an area of ??23 square kilometers. The whole city will be supported by 10,000 solid straight columns, with a Sensing device.

It can detect typhoons, tsunamis and undercurrents, and adjust its strength to resist these external pressures and maintain the stability of Ocean City. In addition to the residential area, Ocean City also has a commercial center, 400 tennis courts, 8 golf courses, two baseball fields, an artificial field for growing fruits and vegetables, and connected roads. The construction cost of Ocean City is estimated to be US$200 billion, and this huge project is expected to be completed by the end of this century. By the 21st century, this "undersea city" will be home to more than 10,000 people. At that time, the deep seabed will no longer be silent, but will become as lively as the mainland. More and more people will explore and build it. , use your own wisdom and hands to draw this huge and magnificent blueprint.

The future of the ocean shows people a brilliant prospect. The vast ocean will make a huge contribution to mankind 2. How to write an essay about red arowana of more than 100 words< /p>

Red arowana (Latin scientific name: Scleropages formosus, English name: Dragon fish) is a red subspecies of beautiful bony tongue fish (other subspecies include golden arowana and green arowana, these three arowanas all belong to the beautiful bony tongue fish) tongue fish).

There are four subdivisions: orange, pink, deep red and blood red. Among them, blood red is the most beautiful and valuable, and the quantity is very small. Due to the influence of Chinese dragon culture, the dragon fish has become the incarnation of auspiciousness and has the meaning of attracting fortune and treasure, so it is elegantly called Feng Shui fish.

The reproductive capacity of the red arowana is weak. The female fish lays eggs, and the male fish hatches and raises them in the mouth, which is very strange. Because of the two beards on its mouth, the large shiny scales and its ancient origin, people naturally connected it with the mysterious dragon and called it "dragon fish".

In Southeast Asia, Hong Kong, Macao and Taiwan and places where overseas Chinese are concentrated, arowana is regarded as a sacred fish. It is believed that it can prosper the home and ward off evil spirits, and is raised as a feng shui fish. Especially the red arowana, because it is on the verge of extinction. Extinct, it was listed as a Class A protected animal under the Washington Wildlife Conservation Treaty in 1980 and is highly valued. In Hong Kong, Macao and Taiwan, the price of a red arowana can exceed one million yuan, and it is regarded as a symbol of wealth and status.

[1]. 3. Morphological characteristics of deep-sea arowana

Black megamouth fish is also called "deep-sea arowana" and belongs to the order Macrosoma. Despite its small size, this fish is a vicious predator.

It has a large head, armed with a large number of long, pointed tusks, and uses a light source to fish for bait.

The deep-sea arowana lives at a depth of 1,524 meters. There, the visible light from the sky has been absorbed in the middle zone, and the deep zone forms an extremely dark environment. In this environment, the eyes of the black giant mouth fish are specialized into tube shapes, with photoreceptor cells densely packed under the large crystals.

Like the deep-sea angler, it has a large head and is armed with a large number of long and pointed tusks. Similar to the deep-sea angler, it also has a light-emitting device for fishing. The difference is that its light-emitting device is not It grows on the back of the head, but on the lower jaw.

Like the deep-sea angler, it flashes and swings back and forth to lure prey, and when the prey is close, it bites it with sharp teeth. There are also two rows of light emitters on both sides of the giant mouth fish's body. These light emitters can signal other giant mouth fish during mating, and can also imitate the sparkling light coming from the sea surface, thus misleading predators coming from the depths below. fish. The biggest difference between the black giantmouth and other species of the giantmouth is that they have a pair of light emitters under their eyes, which can serve as searchlights when searching for prey in the deep ocean depths. 4. Composition on fish at the bottom of the sea

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 have the style of the mountains of Tianmu Mountain.

The water of Tianmu Lake is as clear as the water of Qiandao Lake. That’s why it’s called Tianmu Lake.

The underwater world in Tianmu Lake is particularly eye-catching. There are many fish in here that I have never seen or heard of.

The first thing that caught my eye were fish with yellow heads and gray tails. The cutest thing about it is that it twists and turns when it swims. It’s so beautiful. I couldn’t help but exclaimed “Wow”.

There is also a shark that dominates the ocean, but the shark here is not the ferocious man-eating shark we see on TV, but a shark that cannot eat people. , a cute little shark, I feel very affectionate to it when I look at it. Slowly, I watched it swimming back and forth in the water, and I couldn't help but laugh.

And..."Wow" there are some big turtles here, and people are coming over one after another. These turtles are crawling in the water.

I thought silently in my heart: How many years would it take to keep such a big turtle! Next to it is a small shop, which is full of decorations made from things from the sea, such as sea shells, sea shells, and conches, which are welcomed by many of us. There are cute dolls, various hand ornaments, beautiful wind chimes... The idiom of cheap and good quality is fully reflected here. 5. An essay about Hexagonal Arowana for the third grade of primary school, 30,000 words

Hexagonal Arowana

This name is very strange, and you may think it looks scary and scary.

However, its real name is not "Hexagonal Dinosaur", but "Hexagonal Dinosaur Fish". Although it looks scary on the surface, it is actually timid and cute in nature. They come from freshwater lakes in Mexico. Nowadays, this kind of fish can rarely be seen in the wild because many of them have been caught by humans. It is said that the "hexagonal dinosaurs" raised in captivity are sensitive, cute and courageous. It's small and not easy to hurt people. If they are raised well in captivity, it is generally not a problem to live to eight to ten years. It eats mealworms, turtle food, pork, etc.

I remember that day when I just bought the hexagonal dinosaur fish, my father was furious when he saw it and asked a lot of questions: "What is this? This thing is really scary! What does it eat? Will it bite?" "Human? Is he a lizard?" I pretended to listen, but in fact I was observing the hexagonal dinosaur fish attentively. Then I suddenly realized that this fish is beautiful! The beauty lies in its horns, which are bright red, like six precious and beautiful corals. At the same time, its eyes are also very beautiful, black, like two black pearls. It has four legs, which are thin and short. Don’t underestimate them. They can be of great help when the hexagonal dinosaur fish swims. Yes! 6. An essay about the death of golden arowana

After the golden and silver arowanas he bought last time were pecked to death by golden fish, my father learned his lesson and bought a new fish tank and an imported fish. The golden arowana - Qianhu pepper red arowana, was raised alone.

The Arowana looks noble and cute. The fish body is 25 centimeters long, and its triangular head is inlaid with a pair of bright marble-like eyes. Under the eyes is a big mouth. When it is opened, it looks like a child yawning. There is a pair of short, pointed tentacles in front of the mouth. The scales on its body are shining with golden light, and it looks majestic, like a general wearing armor; its pectoral fin is red, large and long, and its arc is extremely graceful when turning; its red dorsal fin is like a battle flag it carries; its tail fin It is also red, like an oval fan. When the tail is swung, it seems to have a heroic spirit, and there is an aloof temperament in the eyes, which makes you feel very kingly. Arowana is very interesting when eating. It likes to eat fish, shrimp, and insects the most, and it wants to eat them alive. Dad bought barley worms for them, went to Fangshan Reservoir to catch some small fish and shrimps, and kept them in a large bucket for the arowana to eat at any time. The golden arowana is very vigilant when eating. When his father feeds it worms, when the worms are thrown in front of its eyes, it is not in a hurry to eat. It steps back first and stares at the worms intently. It takes a closer look and confirms that there is no danger. You can rest assured. When using it, step forward immediately and swallow the bug in one gulp. After eating, he swam away with his tail flicking, stretching and yawning from time to time. Whenever I have free time, I go to see it and feed it some small fish and shrimps. The arowana seems to like me very much. It often swims in front of me and flicks its tail. I am often fascinated by it and never tire of it.

The Arowana is noble and cute. I like its sparkling scales and its graceful and smooth swimming style. 7. The environment of deep-sea arowana

The photosynthetic zone has plenty of sunshine and the most abundant food. However, some crustaceans and clawfoots that specialize in phytoplankton will swim under the sun during the day to escape surface predators. They dive to waters hundreds of meters deep, migrate to the surface to feed at night when it is safer, and return to deeper waters shortly before dawn.

Some deep-sea fish will also migrate day and night to prey on cataplasm, and other larger predatory fish will follow, triggering large-scale animal migration activities. This behavior can increase the exchange of materials between surface and deep layers. The giant mouth fish is one of the fish that participates in this diurnal vertical migration, so it is called Deep Sea Dragonfish. 8. An urgent composition about "Jiaolonghao"

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 can also be regarded as a hero of our country. You guessed it, haha, I am the "Jiaolong" who just dived to a depth of 5057 meters. Don't open your mouth so wide. Do you really want to know more about me? Then I'll tell you about my experience.

The reason why I can dive into such deep waters is because of my appearance design. I am like a great white shark, with a white round "body", an "orange" head, and an X behind me. Stabilizer wing. I am more than 8 meters long and 3 meters wide, and I have seven thrusters on my body. I'm made of the strongest special glass bead material that can withstand water pressure while maintaining balance.

On July 26, I took three scientists on board and started my diving career. Before starting, the scientists conducted a thorough and detailed examination on me and told me that they trusted me, and I also Trust them. You know, these three scientists are the real dragons. The country's selection of them is more stringent than that of astronauts. Their level is naturally high. This time my goal is to dive to the deep sea area below 5000 meters.

The sea above 200 meters is blue and beautiful. The sunlight refracts into the seawater, creating colorful ripples. There are colorful fish and strange underwater creatures swimming around. But below 200 meters, light cannot penetrate the water layer, so there is darkness. I had to rely on the sonar system to know where the fish were, where the pits were, and where there were obstacles to avoid. At this time, I found a "mouse" in the deep sea. I was surprised that mice can also survive in deep water? After listening to what the scientists said, I realized that this was a rat tail cod. It was really strange. There is also a fish with a tail like a rat. So how does it maintain balance while swimming? I was thinking wildly when I suddenly felt a pain. When I looked at the instrument, I saw that we had dropped to 4,000 meters. Scientists said that at the bottom of the sea at 4,000 meters, there is a pressure of 4,000 tons per square meter, which is equivalent to an 800-pound object on a little finger. , but don’t worry about me, I can get through it.

When I crossed the 5,000-meter deep sea, the scientists also hugged each other excitedly and danced happily. Because of my dive this time, our country has become the third country with the deepest diving in the world, which means that our country’s manned deep diving level has reached the world’s advanced level.

With the development of science and technology, I will definitely dive to 7,000 meters next time. Please wait for my good news!