What is the Yangtze River white sturgeon class
What is the Yangtze River white sturgeon class, animals in our lives in fact, we have learned a lot, we have a lot of China's animal species, but there are many animals because of a variety of factors slowly towards extinction, the following Yangtze River white sturgeon is what class.
The Yangtze River white sturgeon is what class 1
White sturgeon (Psephurus gladius) belongs to the sturgeon order, spoon-nosed sturgeon family, white sturgeon genus.
Common name: elephant fish, swordfish, column sturgeon sturgeon, pipefish, anciently known as tuna.
Lavon species name: Psephurus gladius (Martens)
English name: Chinese paddlefish.
Endangered: endangered. China's national Grade I protected wildlife. IUCN (1996) CR CITES (1997) Appendix II.
It is a species of white sturgeon in the genus Beluga of the family Acipenseridae of the order Acipenseriformes. Named for the lighter body color. It is also known as Chinook, Chaojian, and the ancient name of tuna. Body long pike-shaped. The muzzle is long and sword-like, the front end is narrow and flat, and the base is plump. The body has no large hard bony 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 whitish pink .
Distributed in the main stream of the Yangtze River, and also found along the Yellow Sea and the East China Sea, reaching the Fenwei Basin in ancient times. It is a semi-anadromous migratory fish. It inhabits the main stream of the Yangtze River and occasionally enters large lakes along the river. The amount of eggs can reach 200,000, and the spawning ground is in the upper reaches of the Yangtze River around Yibin. The heaviest weight can be more than 500 kilograms. But generally more than 100 kilograms. To fish for food.
White sturgeon is a large economic fish endemic to China, listed as a precious protected animal. Distributed in the Mississippi River Basin in North America and the spoon-nosed sturgeon are the only two remaining species of this family. This family of fishes has important academic value in the origin, evolution and geographical distribution of fishes.
The body is long, pike-shaped, slightly flattened anteriorly, stout in the middle, and slightly flattened posteriorly. The head is extremely long, more than half the length of the body, and it is covered with plum-shaped traps. The muzzle is sword-shaped, especially prolonged, narrow and flattened anteriorly, broad and plump at the base. The ventral surface of the head of the kiss, can be freely retracted. Ancient books have "tuna mouth in the jaw, long nose cartilage also" records, the white sturgeon ecological characteristics of a concise summary. The upper and lower jaws have small, sharp teeth; a pair of kissing whiskers, short, located on the ventral surface. The eyes are small.
The entire head dermal surface is densely covered with many fine plum blossom spots of sensory nerve cell tissue. Gill pores large, body smooth and scale-free. In the upper lobe of the caudal fin there are eight ridged scale plates that extend backward to the upper lobe of the caudal fin. The dorsal fin begins after the ventral fin and is composed of unbranched fins. The caudal fin is crooked, with a well-developed upper lobe and a row of spiny scales on the anterior margin. The intestinal tube is short, with 7-8 spiral flaps in the intestine. The head, dorsal body and caudal fin are greenish gray, and the abdomen is white.
White sturgeon is a semi-anadromous migratory fish. Inhabiting the lower and middle levels of the Yangtze River mainstem, and occasionally also into large lakes along the river, large individuals inhabiting the deep water of the mainstem sloughs, good swimmers, often cruising in the Yangtze River sections of the vast water layer; juvenile fish are often to the tributaries, the port, and even the mouth of the Yangtze River in the semi-saline water area to feed. Whether the white sturgeon like the Chinese sturgeon need to fertilize the growth of the sea, it is not clear; but from the existing data analysis, it is not sure that it is a kind of river and sea migratory fish.
The white sturgeon is a large fierce fish, adult and juvenile fish to fish as the main food, but also eat a small amount of shrimp, crabs and other animals. White sturgeon is also a large fish. The age of sexual maturity for the first time is 7-8 years old, the individual length is generally about 2 meters, weighing more than 25 kilograms. According to the famous zoologist Professor Bingzhi more than 50 years ago, in Nanjing, has captured a tail 7 meters long and weighing thousands of pounds of individuals, so far it is still the world's highest body length of freshwater fish records.
Sichuan fishermen also have "jack Lazi (Chinese sturgeon) ten thousand pounds of elephant (white sturgeon)," said. White sturgeon reproductive season in March-April, spawning sites in Sichuan Province, above Luzhou, the rapid flow of water velocity of about 0.49 m / s, water depth of 10 meters or less, the substrate is mostly rock or cobblestone section of the river, a more centralized spawning ground in the Yangtze River near the county of Jiang'an and the Jinsha River near Yibin Bashiashi Creek section of the river. Mature eggs are grayish-black and large, and the eggs drift and develop with the water, and the juveniles go to the mouth of the Yangtze River to fertilize and grow.
The white sturgeon is distributed in the upper and lower reaches of the Yangtze River mainstem, but also in the estuary of brackish and freshwater waters. In the past in the Qiantang River in Zhejiang has been found, may be bypassing the mouth of the Yangtze River and into the. The annual production is about twenty-five thousand kilograms or so. In the last decade, due to overfishing and other reasons, resources are declining, and are now endangered.
White sturgeon individual large, meat flavorful, and rich in fat and high protein. Muscle protein content of 17.18%, 5.64% fat, liver protein content of 8.71%, 8.20% fat; ovary protein content of 13.47%, 15.42% fat. Muscle and eggs contain 17 common amino acids that can be measured, and the content of its various amino acids is the same as that of Chinese sturgeon. Because of the rich nutrition, has always been regarded as edible treasures, Jiangsu, Shanghai area shad, gun (white sturgeon), shad and a (Chinese sturgeon) listed as the four famous freshwater fish. In addition, the medicinal value of white sturgeon is the same as the Chinese sturgeon.
Spoonbill sturgeon fish first appeared in the Cretaceous period (more than 100 million years ago). Today there are only two surviving species of sturgeon in two genera, which are distributed in the Yangtze River in Asia and the Mississippi River in North America. The main reason is that in the ancient geology due to the Quaternary Ice Age produced drastic changes in the environment, so that the original more widely distributed spoon-nosed sturgeon in many places disappeared, only two species in the above two still have the basic conditions for survival in the river survived.
The white sturgeon is a relict animal, which is extremely valuable in scientific research; in addition, the number of existing populations is very small. For this reason, the State Council Environmental Protection Committee in 1983 and 1987 issued two "key protection of wildlife list" will be listed as a class of key protection of precious and rare animals. Although the scientific research department is currently embarking on artificial propagation research, but in the absence of a large number of artificial breeding before, but also strictly prohibit the killing of parents, juvenile fish, and vigorously promote the juvenile sturgeon back to the river, in order to protect and save this rare and endangered species.
White sturgeon also grows in the Caspian Sea and the Black Sea, and in Russia up the Volga and Ural rivers. The largest white sturgeon ever recorded was 28 feet long and weighed 2,860 pounds. Fish over 1 ton have also been caught, but apparently not with a fishing rod.In 1991, a group of Swedish anglers came to Russia. They caught white sturgeon weighing 250 pounds on a large drift hung with 1 to 3 pounds of live bait on a 50-pound tensile polyester line.
The largest white sturgeon ever reported, one caught in the 19th century in the . The largest white sturgeon ever reported was caught in the Columbia River in the United States in the 19th century, weighing 1,800 pounds, and another, also 1,800 pounds, was caught on the Kiresa River in British Columbia, Canada. The highest recognized record was a 1,285-pound, 12.5-foot white sturgeon, caught in 1951 on the Dallas River in Oregon using the longline method. Due to dam construction and overfishing, fish of this size no longer exist today.
Columbia River fishing laws require sturgeon caught smaller than 40 inches and larger than 72 inches to be released. Now that "catch-and-release" is common, white sturgeon have surpassed salmon as the most commonly caught fish on the Columbia River, according to the Oregon Department of Fish and Wildlife. Sturgeon of all kinds will repeatedly jump out of the water after being hooked, and then desperately struggle to sprint, or tenaciously sink to avoid being caught, with float or spot fishermen can catch them.
What is the category of Yangtze River Beluga2
I. What is the Yangtze River Beluga?
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-like, 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 is 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, the relevant personnel have not found the white sturgeon, and there is no artificially bred individuals survive.
The above is the introduction of the Yangtze River white sturgeon, white sturgeon originally distributed in the Haihe River to the Qiantang River between the major rivers, and now mainly in the Yangtze River Basin, as well as the Yellow Sea, the Bohai Sea and the East China Sea and other offshore waters. Large white sturgeon mostly inhabits the deep-water sloughs of the main stream, good at swimming, often cruising in the Yangtze River sections of the vast water layer; juvenile fish are often to the tributaries, the harbor road, and even the mouth of the Yangtze River in the semi-saline water area to feed.
What class is the Yangtze River white sturgeon3Yangtze 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 published online recently by the international academic journal Science of the Total Environment. In the paper, researchers said the Yangtze white sturgeon was expected to be extinct by 2005-2010. A pre-copyedited version of the paper was published 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 has a very small population. The white sturgeon is a rare and precious animal that is protected by the Environmental Protection Commission of the State Council in 1983 and 1987. It belongs to China's national Class I protected wildlife. Although the scientific research department is embarking on artificial breeding research, but before the large number of artificial breeding, but also to 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, and is 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 measures for the Yangtze River Basin to get rid of the "no fish" predicament brings hope.
As one of the richest rivers in the world in terms of aquatic biodiversity, the Yangtze River supports a wide variety of fish species, but in recent decades, the Yangtze River's fish species have been declining at a rate visible to the naked eye, and the Index of Biological Integrity (IBI) has reached the worst possible level of "fishlessness".