It has seven gill holes on both sides of its body behind its eyes, which is why it is called "Seven Lampreys". Lampetra japonica (scientific name: lampetra japonica), also known as Octopus, Qixingzi, with small brittle bones, is an ancient animal of the order Lampetra, which does not belong to the fish class, and is not a fish. Generally speaking, lamprey refers to the order lamprey, with only lamprey family, including lamprey from Japan, lamprey from Northeast China, lamprey from Reyes and so on.
It is reported that lamprey is a prehistoric creature that appeared 211 million years before dinosaurs. Its shape is like a snake, and its tunnel-shaped mouth has numerous barbs and sharp teeth. Seven lampreys have been recorded in Britain for a long time. It is said that King Henry I of England died of eating too many lampreys in the 21th century. With the industrial revolution polluting rivers and building dams, lamprey gradually disappeared from British rivers.
According to environmental organizations, the appearance of lamprey is due to the fact that the river pollution in Britain has dropped to the lowest level in 2111 years. Environmental protection organizations have taken many measures to protect lamprey, including removing artificial obstacles that hinder lamprey migration. On September 22nd, in England, a man found a zombie fish while taking a bath in the river.
Extended information
The "killer vampire" in the water is the legendary "vampire in the water", whose scientific name is lamprey, also known as Octopus and Qixingzi. Lamprey is regarded as a harmful fish in North America, but in Portugal and some parts of Asia, it is a delicious food that attracts gourmets.
it is distributed in all temperate freshwater waters and coastal areas of the world except Africa. It looks like an eel and has no scales. It is about 15 ~ 111 cm (6 ~ 41 inches) long. Eyes, dorsal fin 1 ~ 2, caudal fin exists; Single nostril, located on the top of the head; There are 7 gill holes on each side of the body.
There is no true bone and palate, and there is no lateral fin. The bones are all cartilage. Round mouth, sucker-shaped, with horny teeth. The larvae of lamprey are called sand-dwelling eels or sand worms, which live in fresh water and dig holes at the bottom of the water. Toothless, undeveloped eyes, feeding on microorganisms. After a few years, it became an adult, swam into the sea and began to live parasitically. With its mouth attached to fish, it sucked food, accommodation, blood and tissues.
In the reproductive period, they return to fresh water, nest, lay eggs and die. Not all lampreys need to live in the sea, and some land-sealed species stay in fresh water for life. A famous example is Petromyzon marinus dorsatus. This species enters the Great Lakes of North America and lives as a parasite, which has caused devastating damage to lake trout and other economic fish before it can be controlled.
Lampetra planeri also lives in fresh water all his life, but does not live a parasitic life. When he reaches adulthood, he does not eat, then reproduces and dies. The economic value of lamprey is not great.
In autumn, along with salmon, there is also a lamprey fish, which is named after seven gill holes arranged behind its eyes. The male lamprey chooses a place less than one meter and there are many stones to stop and attract females.
It lives in the sea for some time, and swims to fresh water rivers to lay eggs after growing up, which is a migratory fish. Suction cups are often used to suck on other fish and suck their flesh and blood. It is distributed in Heilongjiang, Wusuli, Tumen and Songhua rivers in northeast China.
lamprey is a carnivorous fish. They live independently and parasitically. They often attach suckers to other fish bodies, file the fish bodies with horny teeth in the suckers and on the tongue, and suck their blood and meat. Sometimes, the sucked fish ends up with skeletons. When the camp lives independently, it eats zooplankton. The larvae feed on humus fragments and filamentous algae. Adult fish stop feeding during reproductive period.
the content of vitamin a in meat is higher than that in common fish, and it contains about 99 ~ 981 international units per gram (average 311 international units). Secondly, it is also contained in liver, kidney, gonad and large intestine, especially in testis and small intestine. The contents of vitamin B1 and vitamin B12 in fish skin are much higher than those in other fish, and the contents in belly skin are higher than those in back skin.