When a British man was taking a bath by the river, he suddenly found a half-meter-long creature swimming in the water, which scared him back again and again! After calming down, driven by curiosity, he approached slowly to see what it was.

I saw that this eel-shaped creature is a round mouth of Zhang Zhu, full of sharp teeth, and seven small holes are evenly distributed on the side of the head. Is this a new species? Thinking like this, the man tried to catch it.

As a result, I failed to catch it several times, so I had to force it into a crack in the rock in the shallows. At this time, more and more villagers came to watch the news and said that they had never seen such a creature. So everyone suggested calling the police.

The police and biologists rushed to the scene and finally caught it ashore! After careful observation, the experts at the scene came to a conclusion that really surprised some people in the place!

So this is the lamprey that has been extinct in Britain for 200 years! Also known as "zombie fish". It usually uses a sucker-shaped mouth to absorb the fish, then files the fish with its teeth and sucks its blood and meat, leaving only a skeleton. It is worth mentioning that the lamprey has existed on the earth for 360 million years. It appeared earlier than dinosaurs and is one of the oldest creatures on the earth.

Look at this disgusting parasite-lamprey. I feel sick at the sight. This is an animal with cirrhosis. It has no jaw and its mouth is full of sharp teeth.

The lamprey actually came from the ancestors of ancient fish, but with the passage of time, life changed, so it grew up and lived by eating animal blood and meat. The current "lamprey" mainly lives in cold and mild waters, and only in this way can it survive.

The lamprey's mouth is very strange and looks a little scary. "It uses a sucker-shaped mouth to absorb other kinds of fish. It uses the horny teeth on both sides of the inner mouth of the sucker and the horny teeth on the tongue to file the fish and suck its blood and meat. Sometimes the fish that is sucked away ends up with only a skeleton.

Lamprey is also a kind of delicious food, which has been regarded as delicious since the upper class in medieval Europe. It is a famous dish among the nobles. Until now, some countries in southern Europe still regard "lamprey" as an expensive and famous dish circulating in Europe. I wonder if you can eat such disgusting parasites? ?

Morphological feature editing

The lamprey looks like an ordinary eel, with a slender body, eel-like skin and no scales, and a long dorsal fin on the back, which extends backward to the tail and forms a caudal fin around the tail. Besides, it has no other fins. There are 2 dorsal fins, and the mouth funnel is well developed without mouth whiskers. The lamprey has only one nostril, which is located between the eyes on the top of the head. Developed eyes, pinecone eyes, have a photosensitive effect. There are seven gill holes on both sides of its body behind its eyes, which is why it is called "Seven Lampreys". The inner ear has two semicircular canals. At the end of the nasopituitary capsule is the blind capsule. Dioecious, it takes a long larval period to develop and transform into an adult. Adults live a semi-parasitic life, which is harmful to fisheries.

The external nostril is single and located in the center of the head between the eyes; The olfactory sac is isolated from the oropharyngeal cavity. No need. Eyes developed, lying on the side (except for Mordacia of lamprey with back eyes). There are 7 pairs of gill sacs and gill holes, which some people mistakenly think are eyes, so they are called eight-eyed eels; The nostril is single, located between the eyes at the back of the head, and there is a white skin spot on the back. There is a funnel-shaped sucker on the ventral surface of the head, which is round when opened, and there are many soft milky white protrusions on the surrounding wrinkled skin. The mouth is at the bottom of the funnel, and there are many yellow horny teeth on both sides of the mouth. There is a tongue-shaped piston with horny teeth on it. * * * is located at the junction of trunk and tail, and there is a urogenital process in front of * * *. The skin is soft and smooth, without scales, and the lateral line is underdeveloped. No lateral fins. There are two dorsal fins, the base length is almost the same, and the dorsal fin and caudal fin at the back are connected together, and the fins are soft and thin. When you were alive, your back was blue-green, and your abdomen was gray?

The tongue becomes a scraper with tongue teeth. Salivary glands have 1 right. The inner branchial foramen leads to a special breathing tube without pharyngeal skin tube. The skeleton is cartilage without hard bone, and the branchial arch is complex branchial cage cartilage. A small cartilage piece with a medullary arch is attached to the spinal cord. The dorsal root and ventral root of spinal nerve are not connected. The inner ear has two semicircular canals. The kidney is the mesonephros. The Zogurville Canal has degenerated. Dorsal fin 1 ~ 2. [2]

Lamprey is a kind of roundtail animal. No chin, full of sharp teeth, which is one of the characteristics of ancient fish ancestors. The gills are bag-shaped in the original state, with seven points on the left and right, arranged behind the eyes. The mouth is funnel-shaped with circles of teeth inside. It is a round sucker that can attract big fish.

The body length can reach more than 60 cm, and the sea eel is 70 cm long; The lamprey is 15 ~ 19 cm long.

Living habits editor

Some people live in fresh water all their lives; Some of them are migratory, inhabiting the sea in their early years and swimming to Danshui River to lay eggs when they grow up.

The larvae of lamprey are called sand-dwelling eels or sand worms. They live in fresh water and dig holes in the water. No teeth, developed eyes, feeding on microorganisms.

Drill into sand or gravel during the day and come out for food at night. After 3 ~ 4 years, the larvae are fully developed, which is the enemy of cultured fish. It is adsorbed on other fish bodies with sucker-shaped mouths, and the fish body is broken by the horny teeth on both sides of the inner mouth of the sucker and the horny teeth on the tongue, sucking its blood and meat, and sometimes only a skeleton is left in the sucked fish. [3]

Lamprey lives in cold and mild waters. Some live in fresh water, others live in the ocean, but they will migrate to fresh water to lay eggs. Some lampreys are parasitic, and these species live in fresh water or seawater. The non-parasitic lamprey lives in fresh water.

Marine reproduction

When the male sees the female passing by, he immediately sucks her gill holes and tightens his body. The female sucks the rock next to her. After laying eggs, both females and males will die. Its larva is called "sand worm", and its lifestyle and body structure are highly similar to amphioxus.

lamprey

Lamprey is a typical migratory creature, which lives in the sea for a period of time. Enter the river from the sea in autumn and spend the winter in the lower reaches of the river. In May and June of the following year, when the water temperature reaches about 65438 05℃, it will return to the upstream for breeding. Lamprey chooses shallow water, fast-flowing water and gravel-bottomed waters to dig holes and nest and lay eggs. The male sucks the female's head with a sucker and ovulates and inseminates at the same time. The eggs are very small, with 800 ~ 654.38+ten thousand eggs at a time, and the eggs stick to the gravel in the nest. All parents died after laying eggs. Eggs become young eels soon after hatching. Young eels live in mud and sand, bury under mud and sand during the day and come out for food at night. The larvae at this stage are very different from the adults, and the suckers are underdeveloped and triangular, so they are called Shayin larvae and live a free life. The life span of lamprey is about 7 years. After living in the river for 4 years, the larvae metamorphosed into the sea in the fifth year, and after living in the sea for 2 years, they swam back to the river to lay eggs. ?

The number of eels in Europe has been decreasing due to overfishing.

In autumn, in addition to salmon, there is also a kind of lamprey, which is named after seven gill holes arranged behind its eyes. Male lamprey chooses 1 meter below, and stops where there are many stones to attract females. [4]

River culture

Lamprey only breeds in rivers. There are more than 30 known species of lamprey, which spawn from early summer to autumn. The water temperature is about 25 degrees Celsius, and it hatches in about 12 days. At this time, the larvae have no eyes and no suckers. They usually dive into the mud at the bottom of the river and reach out downstream to eat plankton or organic matter in the soil. This is the so-called juvenile period of the sand-cavity eel. After 3 ~ 5 years, you will grow eyes and suckers. The so-called seven lampreys that fall into the sea make a living by sucking and scraping the flesh and blood of salmon, mackerel and cod. After several years, I will return to the river and end my life after spawning. As for the land that lives in the river all its life, it will also die after spawning in the spring of the next year after metamorphosis.

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