Can fish sleep?

Fish is a vertebrate, which needs sleep to eliminate the fatigue of nervous system and limbs, but fish has no eyelids. It can't close its eyes when it sleeps. Sometimes it sleeps in the dark, sometimes it sleeps in the sand or bubbles secreted, and sometimes it swims while sleeping, with different postures.

Unlike people, fish have no eyelids and can't close their eyes when they sleep, so they all sleep with their eyes open. Therefore, it is not easy to master their sleeping position. The following is the sleep state of several kinds of fish, please pay attention.

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According to the Daily Mail, a research team led by Professor Leo Appleby Baum of Balaam University recently conducted an experiment. The experiment was carried out on zebrafish. The zebrafish gene similarity with human gene is as high as 87%, the embryo is transparent, and the brain tissue is similar to human, so it is the most ideal experimental animal. The experimental results about it are also applicable to humans in most cases.

Through 3D high-definition time-lapse photography and high-resolution microscope observation, Israeli researchers discovered the mystery of sleep. When zebrafish is awake during the day, its chromosomes are not very active. Although the damaged DNA is being repaired, it is far from enough, which leads to more and more damage to DNA until it reaches a dangerous level.

At night, when fish sleep, chromosome activity is frequent, and its activity doubles, thus effectively repairing DNA damaged during the day. At night, if you knock on the fish tank frequently to keep it awake, the fish will be on the verge of death.

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