After the completion of the Three Gorges Dam, a reservoir of 1.084 square kilometers will be formed. When the water storage elevation reaches1.75m, the total storage capacity will reach 39.3 billion cubic meters. In addition to the "four famous fish", there are all kinds of fish growing in the reservoir, some of which we have never even seen. They can grow freely in the Three Gorges, which is called the "paradise" of fish.
According to the data, there are more than 350 kinds of fish in the Yangtze River, 324 kinds of fish live in fresh water all their lives, and the rest are migratory fish. According to the different kinds of fish, there is an ancient saying that "a thousand kilograms of wax is like ten thousand kilograms, and a yellow raft is disgraceful." One kilo of wax refers to Chinese sturgeon, ten thousand kilos refers to white sturgeon, and eel refers to mullet.
It means that the weight of Chinese sturgeon can reach thousands of kilograms and that of white sturgeon can reach tens of thousands of kilograms. With the continuous growth, the shape and color of mullet will change greatly. After growing up, it is basically different from before, which proves that mullet can also form a huge individual. Then the Three Gorges Reservoir, which has been storing water for 20 years, is known as the "paradise" for fish. How big can the fish in it grow? It is difficult to reach 10 thousand Jin. Can it exceed 1000 kg?
This should start with fish that can form huge individuals. The common "four big fish" black carp is more than 2 meters long and weighs 100 kilograms, grass carp10.5 meters, silver carp and bighead carp 100 kilograms, and weighs/kloc-0.5 meters. So what other big fish are there?
Acipenser sinensis and ACIPENSER sinensis belong to ACIPENSER family, and the common individuals are 0.4- 1.3 meters long and weigh 50-300 kilograms. The largest individual is 5 meters long and weighs 600 kilograms. It is the largest fish in the Yangtze River, so it is called the "Yangtze River Fish King".
But this kind of fish is a migratory fish, which breeds in the Yangtze River and grows in the ocean. It is not a pure freshwater fish. However, with the completion of the Three Gorges Hydropower Station, their migration routes have been blocked. Whether they grow in the Three Gorges is unknown for the time being. If they can grow, it is not a problem to reach 1000 kg.
The paddlefish and paddlefish are 2 3 meters long, weighing 200 and 300 kilograms, and the longest is 7.5 meters. Also known as China white sturgeon, both white sturgeon and white sturgeon living in the Mississippi River belong to the family Polyodontidae. Because its snout is like a trunk, it is also commonly known as fish.
According to Professor Bing Zhi, a famous zoologist, a fish with a body length of 7 meters and a weight of 1 ton was once caught in Nanjing. The "10,000-pound elephant" mentioned by the people is not groundless, but the white sturgeon is likely to have become history. It was reported on June 2, 2020 that the Yangtze paddlefish failed to enter 2020 and was declared extinct on February 23, 2065, 438+09. I don't know if this kind of fish still grows in the ocean, but I hope they will return to the Yangtze River to lay eggs. There should be no such fish in the Three Gorges Reservoir, because the construction period of the reservoir is long, and they should not be trapped in the reservoir.
Myxocyprinus asiaticus is also known as burnt snapper, yellow steak, wood leaf board, red fish, purple snapper, finch fish and so on. It is a fish of Myxocyprinidae, which lives in the middle and lower reaches, mainly distributed in the Yangtze River and Fujian Minjiang River. After the closure of Gezhouba dam, the parent fish in the middle and lower reaches of the Yangtze River could not be traced back to the tributaries of Tuojiang River and Minjiang River in the upper reaches to lay eggs, and some spawning grounds in Yichang section were also destroyed. Although there are still breeding populations in Baxia River, the number of natural wild populations continues to decline due to overfishing.
So can mullet grow to a thousand pounds? It can only be said that it is difficult. The largest individual of this fish is generally about 20 kg, and occasionally there are huge individuals of about 50 kg. Although it is a large freshwater fish, it has no potential to become a giant fish, and it is basically impossible to grow to 1000 kilograms.
Acipenser schrenckii and Acipenser schrenckii are also called salad, lazy, sturgeon, pomfret, Yangtze sturgeon and so on. It is a kind of fish belonging to the genus Acipenser. It is distributed in the main tributaries of the Yangtze River, reaching the lower reaches of Wujiang River, Jialing River, Qujiang River, Tuojiang River, Minjiang River and Jinsha River. It can be clearly said that sturgeons do not migrate long distances, and they must have been found in the Three Gorges Reservoir.
So can they grow to 1000 pounds? It's also difficult! Because this kind of sturgeon is relatively small, the largest is generally tens of kilograms, and no huge individual has been found in the fishing record. It is possible that the appearance of ACIPENSER schrenckii and ACIPENSER sinensis is similar, and it is not easy to distinguish them. So far, no giant individuals have been found.
These fish are not only relatively large, but also silver carp, snakehead and snakehead. These fish are also easy to form huge individuals, but they can't reach the weight of 1000 kilograms. Silver carp, also known as snapper and swordfish, and commonly known as Matou whale, is a large predatory fish, weighing more than 50 kilograms in adulthood. Siniperca chuatsi is also called yellow-cheeked fish, yellow-cheeked fish, rod fish, salamander with big mouth, water tiger and so on. , its maximum weight exceeds 100 kg. Kunyu is also called diaozi, caodiao, changdiao and fishing rod. Although this kind of fish is a big fish, there are few records about it.
How long a fish can grow is closely related to its life span, because fish are different from us. Our height has not increased, but our weight has increased, and fish have been growing all their lives. We don't know where their limits are, so how long do fish live?
How long can a fish live? In fact, we don't know how long fish can live, and the fishing record is not comprehensive. Many big fish didn't leave enough information. For example, take the most common "four big fish" as an example. Before the rise of the Internet, many people didn't know that they could grow so big, and few people had seen silver carp and grass carp.
In addition, carp can be seen everywhere. How big are the carp you have seen? The best example is abroad. Some countries didn't have carp at first. After the introduction, I didn't expect this kind of fish to breed wildly and get bigger and bigger, and some even exceeded 100 kg. The carp in the vegetable market weighs about 2 kilograms. It is hard to believe that they can grow so big. It takes a lot of time to grow so big, and the exact age has not been systematically verified.
Fish live a long life, and we don't know where their life limit is, although the life span of common carp is far beyond your imagination. According to the report of Qingdao News Network on July 7th, 2065438+00, the title of the article is "Japanese carp live to be 226 years old". This is koi fish in a temple fish pond named Hanako, who was born in 175 1 and died in1July, 977 17.
The reason why it is so accurate is mainly recorded and verified by scientists. The life span of a fish is the same as that of a tree. Scientists carefully examined its scales and finally determined that it was 220 years old, almost the same as the recorded 226 years old.
We just have a better understanding of our life span, and the life span of fish is only a rough estimate, that is, a little knowledge! It is hard to believe that the life span of grass carp, silver carp and bighead carp is only 7-8 years, and some even exceed 10 years.
The life span and weight of fish are equal. The longer the life span of fish in natural environment, the bigger the individual. Take the most common crucian carp as an example. The growth rate of crucian carp is very slow. Even if there is enough food and the water temperature is suitable, it will take about five years for them to grow to 1kg. In some foreign countries that don't eat freshwater fish, the individuals of crucian carp far exceed our imagination and have already surpassed the kilogram class. The older this little fish gets, the slower it grows, so you can imagine how many years it has lived. (I remember reading a data record that the average life span of crucian carp in China is only 6-7 months)
The largest herring recorded in China was caught in Nanjing and made into a specimen. On September 9, 2004, 19 was caught by anglers in Jinniuhu Reservoir, Liuhe, Nanjing, weighing 106 kg and body length 174 cm. The specimen was made by Nanjing Aquatic Products. The other one, weighing 1 14 kg, was captured in the same place on July 13, 2005, and the specimen was made by experts in Shanghai. These two "king herrings" are the largest herring specimens in the world at present, so how many years have these two herrings lived?
What these two examples want to say is that it is not that fish don't grow up, but that fish need to meet a condition to grow up, that is, their life span is short and they don't grow up at all. Only by living long can they grow up. In the natural environment, the life span and weight of fish are equal. As long as there is no human intervention, even the most common fish can form huge individuals. So, can the fish in the Three Gorges meet the requirements for fish to grow up?
Is there a fish condition in the Three Gorges Reservoir? Do you think there are thousands of fish in the Three Gorges Reservoir? There are three main conditions to measure whether there are big fish growing in waters, one is the water area, the other is the depth, and the third is the catch. Fish can only grow up if the water area is large enough, the depth is deep enough and the catch is small.
The area of the Three Gorges Reservoir and the impoundment of the Three Gorges Reservoir form a reservoir of 1.084 square kilometers. Such a large reservoir is also top-notch in China, and the waters are tortuous. The Three Gorges Reservoir is neither square nor round, with more waterfront, so the plants and food on the shore are dense, which provides sufficient conditions for fish growth.
There is a saying that the water depth of the Three Gorges Reservoir is "a big fish in deep water", but the average water depth in the eastern reservoir area of the Three Gorges Reservoir exceeds 100 m, which is not the deepest. It is said that the deepest part of Xiling Gorge is more than 300 meters deep. Fishing enthusiasts all know that there are big fish in deep water, and these big fish are difficult to catch ashore, because the underwater environment in deep water is complex and even rugged, and even if it is caught on a large scale, it is difficult to catch them all ashore.
The catches of the Three Gorges Reservoir and the Three Gorges Reservoir are not large, and there has been no large-scale fishing for 20 years, and the artificial proliferation and release in the reservoir area has never stopped, so as to improve the proportion of juvenile fish population, optimize the fish community structure and scientifically manage the release. Every year, not only a large number of "four big fish" are released, but also a large number of mullet and protected fish are released, which can grow up slowly in the Three Gorges.
Judging from the area, depth and catch, the Three Gorges Reservoir has the conditions of giant fish. Personally, I think that in the Three Gorges, even ordinary fish can grow into huge individuals, because these fish are less disturbed by humans and can grow up slowly. And some giant fish, as long as the time is long, can grow bigger. There may not be a big fish weighing a thousand pounds now. As long as fishing and pollution are controlled in the future, it is not an extravagant hope that fish will grow to 1,000 kilograms. what do you think?
The natural enemy of fish is not other carnivorous fish, but human greed. In fact, we can find that the fish population and density in natural waters of China are very small, which is mainly caused by overfishing and fishing. I hope that the management will be more and more perfect in the future, that there will be more and more fish in the waters, and that the beautiful scenery of fish and shrimp will reappear.