Fish that can live without water

Fish rely on their gills to breathe the oxygen dissolved in the water, so the fish can't live without the water. Once they leave the water, they will die quickly. Species with large Gill pores usually die faster than those with small Gill pores. However, there are a small number of fish, they can live out of water for a long time, because these fish in addition to the Gill as the main respiratory organ, there are auxiliary respiratory organs to assist breathing, so they can leave the water without dying.

As we all know, climbing perch, Douyu, snakehead, moustache catfish and other fish can stay out of the water for a long time without dying. In addition to their own strong vitality, these fish mainly have an accessory respiratory organ called suprabranchial organ in the left and right side of the Gill chamber. The structure of the suprabranchial organ varies from species to species. The suprabranchial organ has a well-developed air breathing function, as long as the organ remains moist, it can absorb air from the air and maintain the life activities of the fish.

In India, there is a school of cystic Gill fishes, whose suprabranchial organ turns into a pair of long tubular sacs that pass back through the muscles near the spine from the Gill foramen to the tail. the inner wall of the capsule is rich in blood vessels, and the capsule is filled with air, so it can live out of water for a period of time.

The skin of eel, catfish, blobfish, @ # @ 236 fish @, @ # @ 237 fish @ has respiratory function. These fish have rich blood vessels in the skin, and the gas can pass through the skin and enter the bloodstream.

In addition to the skin of Monopterus Albus can breathe empty gas, the epithelial cells of the inner wall of its oropharyngeal cavity are covered with blood vessels and can breathe air directly. The Gill of Monopterus Albus has degenerated and can not complete water respiration on its own. It can only live on this air-assisted respiratory structure. Therefore, Monopterus Albus usually raises its head out of the water and breathes.

Misgurnus anguillicaudatus in addition to the skin can breathe air, its intestines have a strong ability to breathe, Loach's intestinal wall is very thin, covered with blood vessels, when there is not enough dissolved oxygen in the water, it will surface, breathe air through the mouth and exchange gas in the intestine. the waste gas is discharged from the anus. Usually, intestinal respiration accounts for about 1 / 3 of the total oxygen uptake. On a sultry day with low atmospheric pressure and lack of dissolved oxygen in the water, the Loach in the water will rise to the surface to inhale, one after another, so Loach is called "climate fish" in Europe.