Yangtze River white sturgeon is viviparous or oviparous
Yangtze River white sturgeon is viviparous or oviparous, white sturgeon, also known as the Chinese spoon-nosed sturgeon or Chinese swordfish, is the spoon-nosed sturgeon white sturgeon genus of fish, is China's largest freshwater fish, white sturgeon is extremely academic research value, known as the "Yangtze River in the living fossil". So the Yangtze River white sturgeon is viviparous or oviparous?
The Yangtze River white sturgeon is viviparous or oviparous 1
The Yangtze River white sturgeon is a fish, so it is oviparous.
What kind of fish is the white sturgeon?
The white sturgeon has great academic research value, known as the "living fossil in the Yangtze River", is the attention of Chinese and foreign "rare treasure". It is a hundred and fifty million years ago, the Mesozoic Cretaceous remains one of the very few ancient fish.
"A thousand pounds of wax, ten thousand pounds of elephant." "Elephant" refers to the Yangtze River white sturgeon, which is said to grow to tens of thousands of pounds. The white sturgeon is a large, adult fish that can grow up to seven or eight meters, swims quickly, and lives in the Mississippi River spoon-nose sturgeon belongs to the same spoon-nose sturgeon family of species. The Chinese swordfish, also known as the Chinese swordfish, is the largest freshwater fish in China. It is known as the "tiger in the water" and the "king of Chinese freshwater fish", and it is also one of the ten largest freshwater fish in the world.
How do you pronounce Beluga?
The pinyin for white sturgeon is [bái xún]
Why did the white sturgeon go extinct?
In the List of National Key Protected Wildlife approved by the State Council in 1988, there are nine species of fish involved in the Yangtze River Basin, which are the white sturgeon, Chinese sturgeon, and Yangtze sturgeon, all of which are first-class protected animals. In addition to the extinction of the Yangtze River white sturgeon, China's endemic Chinese sturgeon and Yangtze River sturgeon are still assessed by the World Conservation Union (IUCN) as "critically endangered" level (status).
As the old saying goes: several birds do not enter the stagnant water, fish and turtles can not be eaten, but because of overfishing, the Yangtze River has been trapped in the "no fish" situation. Of course, the reasons for the extinction of the white sturgeon are manifold. As the flagship species at the top of the Yangtze River food chain, its number was not much, more susceptible to the impact of human activities, such as sand mining ships, docks, etc. to accelerate their demise time. But the main reason for the extinction of the white sturgeon is to cut off the channel between the fattening and spawning grounds.
The white sturgeon is a carnivorous fish, to other fish subsistence, if the upper reaches of the Yangtze River is not enough bait, can migrate to the lower reaches of the foraging. But now the environment has changed, especially after the completion of some dams on the Yangtze River, the downstream road cut off, the food is reduced, resulting in the extinction of the white sturgeon.
Is the Yangtze River white sturgeon viviparous or oviparous2
First, what is the Yangtze River white sturgeon?
White sturgeon, also known as the Chinese spoon-nosed sturgeon or Chinese swordfish, is the spoon-nosed sturgeon family white sturgeon fish. Its body is long pike-shaped, upper and lower jaw have sharp teeth, for the kiss long sword-shaped, the kiss is gradually widened from front to back. The body is not bony plate-like large hard scales, only in the upper edge of the caudal fin there is a row of spiny scales, the back of the light purple-gray, the abdomen and the fins are slightly white powder color.
White sturgeon is China's largest freshwater fish, but also China's specialty of rare and precious animals, belonging to the national level of wildlife protection, known as the "water pandas", mainly produced in the Yangtze River from Yibin to the mouth of the Yangtze River in the trunk and tributaries, Qiantang River and the lower reaches of the Yellow River are also found.
Second, the Yangtze River white sturgeon why declared extinct?
For a long time, by the damming of the river, water pollution, overfishing, waterway regulation, sand dredging and quarrying and other activities, the Yangtze River aquatic organisms have been deteriorating the living environment, the index of biodiversity continues to decline, rare and endemic species resources have been in full decline. White formula dolphin, white sturgeon, shad, cormorant and other species have not been seen for many years, the Chinese sturgeon, Yangtze River dolphin and other species are critically endangered.
Due to environmental changes, there is no longer a natural condition for the survival of the white sturgeon. Since 2003 to the present, the relevant personnel have not found the white sturgeon, and there is no individual survival of its artificial breeding.
Is the Yangtze River white sturgeon viviparous or oviparous3The Yangtze River white sturgeon declared extinct
The Yangtze River white sturgeon did not make it to 2020. Another endemic species of China's Yangtze River has been declared extinct. The news was revealed in a research paper recently published online by the international academic journal Science of the Total Environment.
In the paper, the researchers said that the Yangtze white sturgeon was expected to be extinct by 2005-2010. A pre-proof copy of the paper was posted online on December 23, 2019 White sturgeon are 2-3 meters long and weigh 200-300 kilograms, with the largest reaching 7.5 meters in length. Also known as the Chinese spoon-nosed sturgeon, it belongs to the same family of spoon-nosed sturgeon as the `spoon-nosed sturgeon that lives in the Mississippi River.
What level of protection is the white sturgeon?
The white sturgeon is a relic of the past, which is extremely valuable for scientific research, and the existing population is very small. The white sturgeon is a rare and precious animal that is protected by the State Council's Environmental Protection Commission in 1983 and 1987. It is one of China's national Grade I protected wildlife.
Although the scientific research department is embarking on artificial breeding research, but before a large number of artificial breeding, but also strictly prohibit the capture and killing of parents, juvenile fish, and vigorously advocate juvenile sturgeon back to the river, in order to protect and save this rare and endangered species.
Listed on the IUCN Red List of Threatened Species 2010 ver 3.1 - Critically Endangered (CR).
Listed as a national protected species in China.
Is the white sturgeon a mammal?
The white sturgeon, also known as the Chinese swordfish, is the largest freshwater fish in China. It is also commonly known as the elephant fish because its muzzle is as long as an elephant's trunk. Body long pike-shaped, upper and lower jaws have sharp teeth, long sword-like kiss, its length for the head behind the eyes 1.5-1.8 times longer, the kiss from the front to the back gradually become wider, the front end of the blunt, narrow and flat, the base of the fat. The body has no large bony plate-like hard scales; only in the upper edge of the caudal fin there is a row of spiny scales, the back light purplish gray, the abdomen and the fins slightly white-pink.
In ancient China, the white sturgeon was called tuna. Spring anadromous spawning. Mainly in the Yangtze River in China from Yibin to the mouth of the Yangtze River in the dry tributaries, Qiantang River and the lower reaches of the Yellow River is also found. It is a rare and precious animal specialty of China, belonging to the national level of wildlife protection, known as the "water giant panda".
Sturgeon roe
Sturgeon roe is made from the eggs of sturgeon, which is the most authentic roe. A lot of roe sauce on the market is salmon, black salmon, sockeye salmon eggs, and compared to sturgeon roe sauce its preciousness and nutritional and medical value is much worse.
Ten-year fishing ban on the Yangtze River
The Ministry of Agriculture and Rural Development recently issued a circular on the scope and time of the ban on fishing in the Yangtze River waters. Circular clear, the Yangtze River Basin Aquatic Life Protection Zone, since January 1, 2020, the first to take the lead in the implementation of a comprehensive ban on fishing; the Yangtze River mainstem and important tributaries in addition to the protection of the natural waters outside the zone, at the latest since January 1, 2021, the implementation of the tentative period of 10 years of perennial ban on fishing, which prohibits the natural fisheries resources of the production of fishing.
This unprecedentedly strict ban on fishing brings hope for the Yangtze River Basin to get rid of its "fishless" predicament.