Rare! More than 70 finless porpoises swim and play, which can be said to be a big change in the Yangtze River ecosystem, seeing so many finless porpoise activities, once again imprinted one thing, that is, the mainland Yangtze River fishing ban for ten years is "worthwhile", and from the current stage, as long as the mainland continues to maintain, the future will inevitably be better.
Moreover, it is not only the mainland Yangtze finless porpoise that is appearing on a large scale, in fact, the biological population of the entire Yangtze River region is increasing, and many fish activities are also emerging.
However, occasionally I will see such a statement, that is, "the Yangtze River organisms continue to increase, and fish schools appear frequently", will not lead to the flooding of organisms in the Yangtze River area of the mainland.
So, some people say, shouldn't we open up? Let's take a look at this time, and then explain the issue of protection.
Surprising data! More than 70 finless porpoises swim and frolic
Indeed, the changes of the Yangtze River have been seen by many people, and the Yangtze River can be said to be a very rich river in biological resources at the beginning.
However, due to the impact of large-scale fishing on the ecological environment of the Yangtze River, many biological populations have declined, so that many organisms have even reached the brink of "extinction".
According to the situation of the biological resources of the Yangtze River in mainland China, according to incomplete statistics, there are 2 species of freshwater cetaceans, 424 species of fish, more than 1,200 species (genus) of phytoplankton, 753 species (genus) of zooplankton, 1,008 species (genus) of benthic animals, more than 1,000 species of aquatic higher plants, and there are national key protected wild animals such as baiji dolphin, Chinese sturgeon, Da's sturgeon, white sturgeon, and Yangtze finless porpoise, endemic species such as roundmouth copperfish, Iwahara carp, and long thin loach, as well as important economic fish such as "four major fish".
However, under the continuous impact of the Yangtze River, some of its creatures have been declared extinct or functionally extinct.
For example, in 2022, the IUCN Red List of Threatened Species (IUCN) changed it to extinction, and the Yangtze sturgeon was declared extinct in the wild by the IUCN Red List of Threatened Species (IUCN) ver 3.1, and the baiji dolphin was defined as functionally extinct.
According to public data, the natural catch of the Yangtze River fishery has dropped from 427,000 tons in 1954 to less than 100,000 tons today, accounting for only 0.15% of the country's freshwater aquatic products.
Therefore, before the implementation of the Yangtze River protection on the mainland, the decline of biological resources was visible to everyone, and there was such a saying, that is, if the Yangtze River is not protected, there may be no fish to eat in the future.
Therefore, the mainland has implemented the protection of the Yangtze River, and has seen the changes in the biological resources of the Yangtze River, which has been very obvious.
This time, the explanation about the finless porpoise is in mid-October, from the Hubei Yangtze River Tianezhou Baiji Dolphin National Nature Reserve Management Office released a message note, according to the reserve pointed out that the reserve plays the role of water level scheduling mechanism, overcoming the adverse effects of continuous drought, the Yangtze River Tianezhou old road to maintain a high water level, more than 70 finless porpoises swim and play.
Therefore, seeing the news of "more than 70 finless porpoises swimming and playing", although it did appear under the problem of water sources, when I saw the data, I had to sigh that the changes in the Yangtze River were really obvious.
Not to mention seeing more than 70 finless porpoises swimming and playing, even the basic fish activities are difficult to see, so after the Yangtze River fishing ban, the restoration of the ecosystem is very obvious.
So what has changed in the Yangtze finless porpoise?
The Yangtze finless porpoise is also called "river pig", the body length is generally about 1.2 meters, the longest can reach 1.9 meters, it looks like a dolphin, the body is small, the head is blunt and round, the forehead is slightly convex forward, the snout is short and broad, the upper and lower jaws are almost the same length, the whole body is leaden gray or gray-white, and the life span is about 20 years.
It mainly lives in the Yangtze River on the mainland, and its geographical areas include Anhui, Hubei, Jiangsu, Jiangxi, Hunan and other regions, it has a lively temperament, often swims up and down in the water, and its food includes a variety of fish, of course, these resources are actually declining before the Yangtze River was not protected.
Therefore, after the protection, the expansion of the biological population also provides a certain survival basis for the Yangtze finless porpoise, and in practice, the number of the Yangtze finless porpoise has increased, which is also a very obvious thing.
In 2022, the mainland conducted a data description of the changes in the natural population of the Yangtze finless porpoise, showing a bottoming out rebound for the first time since complete monitoring data was available.
According to the results of the fourth scientific expedition of the Yangtze finless porpoise, the latest population of the Yangtze finless porpoise in the mainland is 1,249, which has increased significantly compared with the results of the scientific expedition in 2017, an increase of 23.4% in five years, which is also the first time that the Yangtze finless porpoise population has achieved a historic decline since the early 90s of the last century, marking a phased victory in the protection of the Yangtze finless porpoise species in the mainland.
Therefore, the increase in the number of finless porpoises in the Yangtze River is the most direct data on the mainland under protection, indicating that the population recovery of the Yangtze River also marks a major change in the entire Yangtze River ecosystem on the mainland, and as long as it continues to be maintained, the number of Yangtze finless porpoises will inevitably increase.
However, in addition to the Yangtze finless porpoise, fish stocks in the Yangtze River region of mainland China have also changed greatly.
Schools of fish are constant: fat and big
That's right, in addition to the Yangtze finless porpoise, the continuous appearance of fish schools in the Yangtze River is also a fact, for example: under the Huanghuan Gate of the Huanghuan Bridge in Chizhou City, Anhui Province, large-scale fish schools appeared, staining the water surface black.
At the mouth of the Sanjiang River at the confluence of the Min River and the Jinsha River in Yibin, Sichuan, the long-lost Yangtze River fish school has returned to the public's field of vision again, and the citizens are both surprised and delighted, those big fish have at least thirty or forty catties (one) ......" and so on. See? One weighs 40 pounds, which is still not small.
All of this shows that the growth of fish stocks is also very obvious, and the fish schools are constantly appearing, fat and large, and the changes in the ecosystem provide them with the basis for survival.
Therefore, there are not only many fish, but they will also get bigger in the future.
In 2023, the report pointed out that since the implementation of the "ten-year fishing ban", the number of aquatic species monitored in Hunan has increased by nearly 30 species, and the finless porpoise in Dongting Lake has increased from 110 in 2017 to 162 in 2022, and the Yangtze River sturgeon and mandarin fish that have not been seen for more than 20 years have reappeared in Dongting Lake. Is there no problem at all?
Therefore, only by increasing the protection of the Yangtze River can we see the emergence of more scarce organisms, the expansion of many biological populations, and the stability of the entire Yangtze River ecosystem, which are all interrelated.
And as the saying goes, protecting the Yangtze River is actually protecting the Yangtze River and protecting itself, because the Yangtze River is a part of the ecological environment and an indispensable part of the harmonious coexistence of man and nature.
However, under the emergence of large-scale fish, many people are saying that the appearance of large-scale fish does not mean that the fish are flooding, so many people are saying.
Will there be an overflow of fish?
It is true that it is normal for everyone to say that they are worried about flooding, but this does not mean that it is really flooding, and the Yangtze River is so large that it has a stable biological chain, and it is unlikely that the so-called flooding will occur.
Moreover, the Yangtze River was once very rich in biological resources without human fishing, and there was no so-called flooding. So, it's unlikely that you're worried.
Moreover, judging from the recovery of the biological resources of the Yangtze River, it has not reached the level it once was. In April this year, the Ministry of Agriculture and Rural Affairs also issued a public statement that the Yangtze River fishing ban has not ended, and do not find various reasons to "open the ban" within ten years, and pointed out that although 15 new species have been monitored in the three years of the fishing ban, 120 of the 443 species of fish that have been distributed in history have not been monitored.
At the same time, it is pointed out that the level of fishery resources is still relatively low at this stage, and the egg resources of the "four major fish" after the fishing ban are 4.5 times that before the fishing ban, but only account for 30.5% of the best level in history. Total fish stocks are up 25.6 percent from before the closure, but only 36.8 percent of the all-time high. There are achievements, but the gap between them and the best is still very large.
The resources of key waters, such as Taihu Lake and Liangzi Lake, have reached 63% and 36% of the normal resource carrying capacity, which is still low.
Therefore, although we have seen the increase in large-scale fish stocks, the actual biological resources have not yet reached the so-called "flooding" situation, and it can only be said that it is a trend to get better and better, and only by continuing to protect will we see a stable resource model, so if we judge the flooding and other problems according to the situation of the fish stocks, it is completely unlikely.
And in terms of the changes in the entire Yangtze River, only with more protection, the Yangtze River will become better in the future, which is the general situation.
#长文创作激励计划#