Do fish sleep at night? Do fish sleep at night

People need sleep, and so do fish. Just as humans sleep in various ways, fish sleep in a variety of ways. If you look closely at the goldfish we raise, you will see that at night, they will hide.

Go to the small rockery, water grass and other dark places in the fish tank and do not move. This is the state of the goldfish when it sleeps. Fish do not have eyelids like humans and are able to close their eyes when sleeping.

Therefore, it is not easy to grasp their posture when sleeping. The following is a list of several fish sleep states for students, please pay attention to them. Some fish such as flowers, sea pigfish; When night comes, they will burrow into the sand and sleep motionless, which is quiet and effective against predators.

Some fish, such as split-billfish and South Sea parrotfish, will secrete a special gelatinous substance in its body, and when they want to sleep, they blow a big bubble like a child, and the gelatinous bubble hardens when exposed to water, and then they drill into the bubble, leaving only a small hole in the mouth, just like in a sleeping bag. Most of the fish that live in freshwater sleep behind rocks and in the dark of aquatic grass. Like carp and crucian carp burrow into aquatic weeds, while mullet and snapper sleep behind rocks.

Migratory fish, on the other hand, swim and sleep at the same time. For example, tuna, mackerel and chiayu swim back and forth day and night, making it difficult to figure out when they are sleeping. When is awake.

It sleeps, and because the fish does not have eyelids, it cannot be judged by the closure of the eyes.

Fish have to sleep, too. It's just that there are no eyelids, so you can't see it. Sometimes you see it standing still in the water, just its cheeks open and closed, then it's sleeping.

All living creatures need to sleep, and fish are not exempt.

Normally, fish sleep at night, but there are some that are nocturnal and sleep during the day and come out at night.

To ensure that the fish can sleep peacefully, it is best to turn off the lights while sleeping and avoid disturbing them with noise, which could cause it to be frightened. In addition, it is best to place some aquatic plants in the fish tank, so that the fish have a place to hide.

We have the impression that one of the most basic actions of sleeping is to close your eyes, but fish always have their eyes open, so many people think that fish will never sleep in their lives. But in fact, you don't have to close your eyes to sleep, especially for fish, they can't even close their eyes. This is because if you want to close your eyes, your eyelids have to fall naturally, but fish don't have eyelids, so you can only keep your eyes open for the rest of your life.

Although the eyes are open, fish also need to sleep every day, and the study of fish sleep began more than 100 years ago, but at that time, scientists observed the abnormal behavior of fish, such as almost stopping swimming, and not responding to objects passing by.

Fish will sleep at night. Because the fish has no eyelids, it cannot close its eyes, so it looks as if it never sleeps. Most of the fish sleep in a quiet state of immobility.

Just like when people sleep, this is how fish rest their bodies.

Almost every fish is sometimes in some kind of energy-conserved state, which we can call resting, or even "sleeping", although this behavior may not be the same as the "sleeping" of most land animals. Many fish, such as sea bass, sleep at night on top of or under logs. Polyps are active during the day and take refuge in the cracks of the reef at night.

The appearance of fish at rest is very different from other times. For example, many small carps that gather together during the day and are very active during the day are scattered at night, unmoved in shallow water. Some poor fighting fish rest during the day and move at night; But almost all fish have to sleep.

There are also animals that swim all the time because they have to constantly spit out water to keep breathing; But they can still sleep when they're exercising, we just don't know.