As Yangtze River enters a 10-year fishing ban, the Yangtze River has become a paradise for fish, and now it has become more "lively" than before. As we increase the protection of the Yangtze River Basin, more and more fish are in the Yangtze River, and sometimes we even see some rare fish. For example, the large-scale knife fish population was discovered in Poyang Lake for the first time in the past 10 years. In addition, the "river pigs" finless porpoise and Yangtze River Sturgeon have also appeared continuously.
plunders came in groups
, there were more than a dozen plunders! In the river section of the main urban area of Nanjing, from time to time, Jiangzhuzi Yangtze River Porpoise jumped out of the water, and groups of river porpoise appeared. People who saw the river porpoise appearing nearby were very excited, and some parents even brought their children to watch the river porpoise.
Some people have also seen the appearance of river pigs and porpoises in the Yangtze River section of Wuhan urban area. The scenes of river porpoises prey in these waters were rare. Staff said that since the Yangtze River entered a 10-year fishing ban period, they have seen the porpoises more and more times. They have encountered the porpoises twice in the same waters, but this is the first time they have seen porpoises appear in groups.
22 During the scientific investigation of the Yangtze River Porpoise in 2022, researchers set up a sampling point every 80-100 kilometers to collect water samples, filter the cells that the porpoise falls into the water through equipment, and then take them back to the laboratory to analyze the distribution of piglets in the Yangtze River. The scientific research ship once saw groups of porpoises and "mother and son pigs". These young porpoises should have been born in April and May this year. Similar situations have been seen in many places. This shows that many porpoises have babies born in many porpoise groups this year, which is great news for strengthening the population size of porpoises.
On the sixth day of the 2022 Yangtze River Porpoise scientific investigation, scientific expedition personnel found several porpoises jumped out of the water near the mouth of Dongting Lake in Lingji, Yangtze River. At least two pairs of "mother and son porpoises" were found in this group of porpoises.
In the 2017 Yangtze River Porpoise Ecological Science Experiment, the number of Porpoises was only 1,012, which was extremely rare. In the past, it was rarely seen in groups of Porpoises, and usually only a small number of Porpoises appeared occasionally. Now the Yangtze River has entered a 10-year fishing ban period and has protected the Yangtze River Basin. It has become a common thing for Yangtze River porpoises to appear in groups on the river to play. The 10-year fishing ban finally waited for them.
Will the finless porpoise proliferate in the future?
There are fewer people fishing, and the Yangtze River has become a paradise for all kinds of fish, and the number of fish is increasing. In the first-level tributary of the Yangtze River, someone saw a large number of fish. These fish clusters gathered together in groups, and it looked very many, just like the river surface was dyed black. This is the result of the fishing ban period. Will rare animals such as Yangtze River porpoises will also flood in the future, so many of them will dye the river surface black?
If it is an ordinary fish, the population size will continue to grow under superior living conditions, and may even proliferate. However, the possibility of rare animals such as Yangtze River porpoises flooding is almost non-existent. The Yangtze River Porpoise is the only cetacean in the Yangtze River. Its body length can generally reach about 1.2 meters, the longest borundum can reach about 1.9 meters, its weight can reach 50-70 kilograms, and its lifespan can reach 20 years. Its body size is a bit like dolphin .
Normally, these Yangtze River porpoises like to live in the seas at the junction of salty and freshwater, and sometimes they live in the freshwater area of the river. Sometimes they like to come out alone, and sometimes they also come out in groups. The most common record is that there are as many as 87 Yangtze River porpoises coming out to move and forage together.
As an animal that looks like a dolphin, the Yangtze River porpoises look cute. They have a lively temperament and like to play happily in the water. From time to time, they will jump out of the water in groups, roll, jump, and even spray water. Sometimes the Yangtze River porpoises will also jump out of the water and jump to a height of half a meter from the water surface. Sometimes the Yangtze River porpoise will swim upright, and two-thirds of the entire body will be exposed to the water surface, keeping it perpendicular to the water surface, which is very cute.
is such a lively animal, and their current situation is not optimistic. Previous research data showed that the number of Yangtze River porpoises is already smaller than that of giant pandas, and is known as the "giant panda in the water". However, as we increase our protection efforts, especially now that the Yangtze River Basin has entered a 10-year fishing ban, these rare animals have the opportunity to continue to grow their population size. In the previous article, we saw that many Yangtze River porpoises appeared in the Yangtze River Basin, and some Yangtze River porpoise babies were found in the scientific research ships.
Although there is a chance to restore the population size, rare animals such as Yangtze River Porpoise will not be flooded because the reproductive ability of Yangtze River Porpoise is not very strong. The peak breeding period of Yangtze River porpoises is between May and August every year, and their pregnancy period is relatively long, around 12 months. Therefore, Yangtze River porpoises that have completed mating this year will give birth to plunder babies the following year, and generally, the plunder only gives birth to one baby in one baby. Therefore, even if all the porpoises become pregnant at the same time, there will not be many porpoise babies in one year.
Moreover, the Yangtze River Porpoise is a relatively large carnivore. They feed on various fish, shrimp and other animals. The "recipes" of the Yangtze River Porpoise that live in different waters may vary. Generally speaking, the higher the level of species in the food chain, the more difficult it is for them to spread. Just like on the prairie, there may be a large number of rabbits and mice, but there are very few beasts such as lions.
Because energy comes from the sun, plants convert solar energy into organic matter through photosynthesis . Although animals cannot perform photosynthesis like plants, some animals will feed on plants and get the energy required from plants, while those carnivorous animals feed on some low-level animals to obtain energy from them. This is the food chain. Energy is transmitted through the food chain, and these energy will be lost during the transmission process. Generally, only 10-20% of the energy will be transmitted to the next species during each transmission process. Predators, including the Yangtze River porpoise, can only obtain the energy required by preying on other animals, and the energy will be continuously lost during this process. In order to survive, these top predators need a large amount of food sources and a large living space, so the number of top predators is generally limited and will not flood.
