"A thousand pounds of wax seeds are worth a thousand pounds of elephants, but the yellow rows are too big to look impressive." This is a visual description by Sichuan fishermen of Chinese sturgeon, white sturgeon, and mullet fish. Sichuan fishermen commonly call the Chinese sturgeon as La Zi, the white sturgeon as elephant trunk fish, and the mullet fish as yellow steak. Proverbs describe the individual size of Chinese sturgeon and white sturgeon. Chinese sturgeon can weigh up to 1,000 kilograms, while white sturgeon is even bigger, weighing up to 10,000 kilograms. As the mullet grows from small to large, its body shape and color change greatly, and it seems to have become a different kind of fish.
Sturgeons are a group of ancient, low-level fish that appeared in the Cretaceous period of the paleogeological period. They still retain many ancient structures. There are 24 species of sturgeons living in the Arctic Ocean at high latitudes. area, the Chinese sturgeon has always been regarded as having important scientific research value in the origin, evolution and geographical distribution of fish. The Chinese sturgeon is a large anadromous fish, with the largest individual recorded at 680 kilograms. It usually inhabits the continental shelf waters along the eastern coast of Asia, feeding, fattening, and growing in the sea. When the male fish reaches the age of 9-18 and the female fish reaches the age of 14-26, it reaches primary sexual maturity. At this time, the minimum male fish is 1.7 meters long and weighs more than 50 kilograms. The female fish is about 2.3 meters long and weighs 120 kilograms. above. Chinese sturgeon broodstock swim upstream from the estuary to the upper reaches of the river with stony river beds to spawn. The eggs are fertilized and develop into juvenile fish, which float down the river and gradually fall into the sea the next summer to be fattened and grow.
The paddlefish is huge and strange in size, with its head taking up half of its body length, especially its snout, which is particularly elongated, like a sharp sword. The surface of the entire head membrane is densely covered with many fine plum blossom spots of sensory nerve cell tissue. The skin of the whole body is smooth and soft, and there are many lateral lines on both sides of the body that look like small tree branches. The paddlefish is the largest living freshwater fish, with a body length of up to 7 meters recorded. The paddlefish first appeared in the Upper Cretaceous. There are only two species of paddlefish in existence. One is produced in the Yangtze River, and the other is the paddlefish produced in the Mississippi River in America. The white sturgeon is a relict of the dramatic environmental changes caused by the Quaternary Ice Age, and is of great value in scientific research. Both white sturgeon and Chinese sturgeon are listed as national first-level protected wild animals.
The mullet fish is the only species among the many species of the mullet family that is distributed in the eastern hemisphere of the earth. The other 70 species are all produced in the Mississippi River Basin of North America. Therefore, they have high scientific research value and are listed as national secondary protected wild animals. Although the individual size of the mullet cannot be compared with that of the sturgeon, it is also a medium-to-large freshwater fish, with the largest individual reaching 30 kilograms.
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