What kind of fish is the Yellow River bream? What made it "disappear" for so long?

The Yellow River snakehead, also known as the Yellow River saury, is a kind of fish that grows in the Yellow River. Because of recent environmental problems, environmental deterioration and man-made large-scale fishing, it has disappeared for a long time, but recently, the photographer was lucky enough to photograph the Yellow River saury, which also marked the improvement of the environment in the middle and lower reaches of the Yellow River in China. The details are as follows:

1 information. The yellow river swordfish is an animal belonging to the genus Scophthalmus, and it is an important migratory economic fish in the middle and lower reaches of the Yellow River. Because it looks like a blade, it is also known as the yellow river swordfish. Because of its economic value and value as a tonic, it is very precious. This kind of fish is transparent and irritable, and dies without water. Generally speaking, saury needs 2~3 years to grow up in the process of swimming back, so it is also very precious and has a good effect on children, the elderly and patients with kidney disease. There is a very famous dish called dry fried saury. Generally speaking, the length of the Yellow River saury is mainly in the range of 20 cm to 40 cm, and the maturity period is three years.

② Present situation and reasons for disappearance. In 1970s and 1990s, due to the ecological destruction in the upper reaches of the Yellow River, the water volume of the Yellow River decreased sharply year by year, and the output of the same Yellow River also decreased sharply year by year. The main living area of the Yellow River saury is in the Yellow River estuary, which is also called? Pour fish? Because of its return, its main producing area is Dongping Lake in Shandong. The main reasons for its disappearance are the destruction of water quality and artificial fishing, the pollution of water quality and the discharge of industrial water, industrial discharge and domestic water, and the water quality of the Yellow River has dropped sharply. The Yellow River saury, as a creature with extremely high requirements for water quality, is naturally difficult to survive. Then, there is the influence of water depth. Because the water depth of the lake has dropped to the usual depth of 0.7 meters year after year, it is difficult to meet the survival requirements of the yellow river swordfish, and a large number of yellow river swordfish die every winter because of freezing.

Fortunately, the photographer of the Yellow River Estuary recently photographed the Yellow River saury, which also shows that the water source in the Yellow River area has been protected and restored. The appearance of yellow river swordfish is the feedback of nature to human beings to protect the environment. I hope that mankind will make persistent efforts to protect the natural environment.