The Yangtze River has been closed to fishing for 10 years. What would the fish look like if there was no food in the water?

As a natural phenomenon in the evolutionary history of life on earth, the evolution or extinction of fish in the Yangtze River is not surprising. However, due to the greedy overfishing of human beings, the timetable for the extinction of the Yangtze River has been greatly advanced.

When people gradually realized that there was no fish in the Yangtze River, a 10 fishing ban was finally settled in 2020. However, in the first year after the official implementation of the fishing ban, people began to worry: Is the Yangtze River fishing ban 10 too strict? The Yangtze River is closed to fishing 10 year. Will there be so many fish that there is no food in the water and fish have evolved again?

10 Is the fishing ban in the Yangtze River too strict? Since 10 issued the ban on fishing, many people questioned that the ban on fishing in previous years was 3-4 months. Is the fishing ban on 10 too strict? In fact, if you look at the following set of data, maybe you will change your mind.

Studies show that the loss rate of modern species is 1000 times faster than that of natural extinction and nearly1000 times faster than that of species formation due to human participation. Under natural circumstances, the rate of species extinction is about 1 species per day, but now it has reached 1 species per hour, which means that every 1 hour, 1 species evolved for thousands of years completely disappears from the earth. This data is simply shocking.

Due to the participation of human beings, the extinction of species on the earth has accelerated by thousands of times. As the mother river, the Yangtze River gave birth to the ancient Chinese civilization, but it also led to the extinction of the mother's "other children".

According to the data in 1988 national list of key protected wild animals, there are more than 400 species of fish in the Yangtze River, of which 180 species are endemic to the Yangtze River and 16 species are rare wild fish. There are grass carp, herring, silver carp, bighead carp and China.

However, due to the pollution of the Yangtze River, the interference of early large-scale water conservancy facilities and overfishing, the fish population has dropped sharply.

For example, the Chinese sturgeon, unique to the Yangtze River, has experienced10.40 billion years since its birth in Cretaceous, and is the oldest fish on the earth. However, it is such an ancient fish that witnessed the extinction of dinosaurs, but now it has become a "new species" of human beings.

The Chinese sturgeon is 4 meters long, weighs 1000 kg and has a life span of more than 40 years. This is a typical anadromous fish. However, due to early overfishing and the construction of Gezhouba dam in 198 1 year, the migration passage of Chinese sturgeon was blocked, forcing the Chinese sturgeon to lose its original spawning ground and making its population decline rapidly.

Later, the storage and navigation after the completion of the Three Gorges Dam further led to the loss of spawning grounds, and now it is difficult to monitor the traces of wild Chinese sturgeon. It is precisely because people gradually realize that there is no fish in the Yangtze River that a fishing ban of 10 was finally settled in 2020.

/kloc-will the fishing ban in 0/0 lead to fish evolution? In addition, will the ban on fishing in the Yangtze River in 10 lead to too many fish, so that there is no food in the water and fish will evolve again? The answer, of course, is that it will definitely evolve.

Evolution is always going on, but the time span is too short, and we can't find some subtle changes in time. For example, just like the article written by the stationmaster a few days ago, in the past 150 years, people's body temperature has gradually dropped from the initial 37℃ to 36.3℃ today, indicating that we humans are also evolving.

However, the fish in the Yangtze River were closed to fishing for 10 years, which led to the changes in the ecological environment of the Yangtze River and some subtle changes in fish. However, the time span of 10 years was too short for people to find this change in time.

However, the webmaster needs to remind that, taking grass carp, herring, silver carp and bighead carp as examples, the breeding and growth cycle of these fish is about four years, so the fishing ban of 10 year can only allow fish to breed freely for 2-3 generations, while the breeding within 10 generation obviously cannot have a great impact on the population characteristics.

The natural catch recorded in the Yangtze River basin last time has dropped from 425,000 tons in 1954 to less than 654.38+10,000 tons in 2020, and the fish caught are getting smaller and smaller. In the past, big fish weighing more than 10 kg were very common, but now they are generally small fish weighing a few kg. If the 10-year fishing ban has not been promulgated, I am afraid that the Yangtze River will really have "no fish to catch". The closed fishing period of 10 is conducive to the self-recovery and reproduction of fish in the Yangtze River, and protecting the ecology of the Yangtze River and the closed fishing order are only the first step.