Participate in the porpoise scientific examination expert three consecutive times: the porch recovery takes longer

The Yangtze River Daily Da Wuhan Client September 24 (Special Reporter Yang Jiafeng) On September 23, the observer found the porpoise traces twice through the River section of the 89 -kilometer Shishou Reserve. Here, with the 21 kilometers of the old Swan Island's hometown, together constitutes the National Nature Reserve of the Hubei Yangtze River Swan Island Baiyou Dolphin. Dr. Hao Yujiang, the captain of the scientific research team of Yichang to Chenglingji Section and an associate researcher at the Institute of Wuhan Aquatic Institute of Chinese Academy of Sciences, said that from the perspective of the optimization of the porpoise's living environment, the long birth period, and the difficulty of pregnancy and child In the short term, large -scale growth cannot be achieved, and there will be no surge.

This is the third time Hao Yujiang has participated in the Yangtze Rolls Basin. He said that many people have a simple desire to think that with the implementation of the 10 -year -old fishing of the Yangtze River, the number of porpoons will increase significantly. Although this desire is good, it is inconsistent with the biological characteristics of this species. At the same time, the Yangtze River has been banned for less than two years in ten years. The porpoons, as the top biology of the ecosystem, will not grow as fast as fish. The growth of porpoons has a lagging effect and requires a gradual accumulation process. Therefore, the number of peels in the short term will not increase significantly, and the protection work is destined to take longer.

The long growth of porpoons has a slow growth of growth

Dr. Hao Yujiang was observing the river. Miao Jian, a special reporter from the Yangtze River Daily

Hao Yujiang said that the breeding cycle of porpoons is relatively long. Its sexual maturity is generally 5 years old, and the porpoise is not easy to get pregnant when it is mature. It is only 7 or eight years old, and the pregnancy is 12 months, which is longer than the human pregnancy. The lactation of porpoises is generally 6 months. After birth, I have been with my mother for one to two years. The breeding cycle and life cycle are relatively long, which is very similar to humans.

The porpoise not only has a long production cycle, but is basically a single child, and occasionally twins, but there are no multiple babies. The individual is very large when the porpoise is born. Moms are generally about 1.5 meters long. The baby porpoise baby is about 70 cm. It reaches half of the mother's body length and weighs five or six kg. The twins of the porpoons are basically impossible to survive. "The breeding characteristics of porpoons cause the population to be recovered very slowly. This is also very different from fish. But population recovery is much faster than porpoons. "Hao Yujiang said.

Hao Yujiang said that in the wild, the mortality rate of the porpoons within the age of two is very high, even as high as 60%to 70%. Little porpoons will not avoid danger. Inadequate life experience and curiosity are easily harmed. This has also further caused porpoons to recover from the population of the porpoise. It will take years to work for several years. Different creatures recover differently, and porpoons take longer as top creatures.

The living environment of porpoises is greatly improved

Members of the Kaokai Boat Vision Team are observing the river surface. Miao Jian, a special reporter from the Yangtze River Daily

"From Yichang along the river, the two sides of the Yangtze River are becoming more and more beautiful, which is very different from the 2017 porpoise scientific examination in 2017." Hao Yujiang said that the environment of porpoise life is much better, the environment on both sides of the strait has improved significantly, and the rivers and rivers are also very Clear, no illegal docks, nor the past fishing nets. Porphyolic volunteers spreading along the Yangtze River coast all woven a safety protection net for porpoons.

In addition, from the perspective of the survey of fishery resources, the increase in fishery resources has increased significantly after the 10 -year ban on fishing in the Yangtze River, which also shows that porpoons have become more foods.

Hao Yujiang introduced that, in addition to the protection of the survival environment of the Yangtze River in the past ten years, the local protection has also achieved good results. In 1990, as an attempt to relocate the ground, the first batch of five Yangtze River porpoons was moved into the old way of Swan Island and succeeded. In 1992, the State Council approved the establishment of the "Hubei Yangtze River Swan Island White Cycling Dolphin National Nature Reserve". At present, the Yangtzepu pills in the relocation area have reproduced a large family of 101 heads, becoming a typical successful case for the protection of the Yangtzepin Pills. At present, the number of peels in the Yangtze River Basin protection is more than 150, and the average annual number of young dolphins has exceeded 10 heads, showing a good growth momentum. In 2021, the Ministry of Agriculture and Rural Affairs organized the largest -scale Yangtze Rolfin relocation protection actions, and successively exported 19 Yangtpays from the Relief Area of ​​the Yangtze River, Hubei Swan Island Yangtze River, which was relocated. From the Tongling Freshuria Dolphin Reserve to the two heads to Swan Island, and to grasp the genetic spectrum of the relocated groups through census, evaluate the risk of nearly pro -pro -proof, continue to promote the exchanges of individual porpoises, and optimize the structure of the population.

[Edit: Deng La Xiu]

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