Do you have the knowledge to sleep on fish

Fish sleep with their eyes open, hehe.

Unlike humans, fish don't have eyelids and can't close their eyes when sleeping, so they sleep with their eyes open, so it's not easy to master their posture when sleeping.

Migratory fish, on the other hand, swim and sleep at the same time. They swim all the time because they have to constantly spit out water to keep breathing, such as sharks, tuna, mackerel and chia, swimming back and forth day and night, making it difficult to figure out when they are sleeping; When is awake.

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 get into the bubble, leaving only a small hole in the mouth, just like in a sleeping bag.

Will sleep.

Fish sleep is like a human nap, sleeping for a short time, and waking up when there is movement, which is a common characteristic of not only fish, but also other lower vertebrates.

When fish sleep, they will stop swimming and stay in one place, but the length of time they stop swimming varies from fish to fish.

Fish sleep. Fish are sleeping. Although living in the water, you can rest the same.

Normally, it swims in the water, but when it is suspended in a certain position for a long time, it means that it is sleeping. Different fish have different habits when they sleep, some hide in aquatic plants, and some bury in the sand.

Fish are sleeping. Fish are vertebrates, need to sleep to eliminate the fatigue of the nervous system and limbs, but the fish has no eyelids, it can't close its eyes when sleeping, it sometimes sleeps in the dark, sometimes it sleeps in the sand or secreted bubbles to sleep, sometimes it swims while sleeping, all kinds of different postures, just live freely.

Vertebrates all sleep, and fish are vertebrates and also need to sleep to eliminate fatigue on the nervous system and limbs, however, fish does not have eyelids (eyelids) so when it sleeps, it cannot close its eyes.

We often see a fish standing still in the water, its gills flickering and moving, which is exactly what the fish is sleeping, and if you wake it up, it will swim in the water again.

Fish also sleep, but because fish do not have eyelids, they do not close their eyes when they sleep. Most fish remain motionless in the water when they sleep, and they sleep for a short period of time. A small number of fish sleep during exercise, but it swims very slowly.

Fish also sleep, but because they do not have eyelids, they do not close their eyes when they sleep, but stay in a darkly lit place to rest.

Fish need to sleep.

Fish sleep for a few minutes at a time, or even a few seconds at a time. Fish can never close their eyes because they don't have eyelids, so they sleep with their eyes open. To maintain breathing, the operculum still flapps slowly and rhythmically, occasionally with a stroke of the pectoral or caudal fin to keep the body balanced.

Fish sleep like a human taking a nap, some for only a few minutes, some for a few seconds, mainly because they must always be vigilant or they will fall into the mouth of an attacker.

Fish need sleep just like people.

If you look closely, you will find that at night, they will hide in the dark places such as small hand rockeries and aquatic plants in the fish tank and remain motionless.

The state of the fish while sleeping.

According to the China Science and Technology Press-Popular Science China Network

Most fish sleep with their eyes open because they generally have no eyelids (some fish have eyelids). Mainly some cartilaginous fish), the ruler does not show the sleep characteristics of rapid eye movement like humans, so it is not easy to detect that it is sleeping.

Some of them sleep during the day, so you can still see fish swimming at night, which makes people mistakenly think that they are not resting.

In addition, some fish still gently shake their tail fin while sleeping, maintaining their balance, and appear to be still swimming.

Fish sleep. Fish are not like humans, they do not have eyelids, and they cannot close their eyes when sleeping, so they sleep with their eyes open. Therefore, it is not easy to grasp their posture when sleeping.

For example, many small carps, which are very active during the day, disperse at night and remain motionless in shallow water. Some 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.

Both humans and animals need to sleep. If you don't get a good night's sleep for a long time due to external interference, both humans and animals will be physically and mentally exhausted, and even lead to death.

Fish sleep, but they sleep with their eyes open.

Fish also need to sleep to relieve stress and maintain physical balance. It's just that the fish sleep with their eyes open, so people have the illusion that they can't sleep.

Fish sleep with their eyes open because they don't have eyelids and can't close their eyes when they sleep. It hides in the dark and sleeps, and it sleeps motionless. Some fish will burrow into the sand when they sleep, which is quiet and can prevent damage from natural predators; Others secrete bubbles when they sleep, and then burrow into bubbles, like sleeping bags; Others swim while sleeping.

The sleep time of fish is very short, the total sleep time is generally only 2 3 hours a day, and the sleep time is not fixed, or it is done in multiple times. In the case of carp, crucian carp and goldfish, for example, they may have to sleep more than a dozen times a day, and each time they sleep for about 20 to 30 minutes, which is too short for us humans.

Sleeping characteristics

1. Sleeping in the dark: When many fish sleep, in order to avoid the attack of natural enemies, they will generally hide in the dark, such as carp, crucian carp, mullet, snapper, etc. Usually carp and crucian carp hide in aquatic plants to rest, while mullet and snapper sleep behind rocks.

2. Sleeping in the sand: Some benthic fish, such as flower sea pigfish, golden carp and micro-humphead fish, usually move underwater, and will hide in the sand when sleeping. In this way, other predatory fish are avoided from being eaten.

3. Secrete bubbles: In addition to the fish that sleep with the help of natural rock bodies, there are also some fish that can create a safe bubble by themselves, such as split-billfish and South Sea parrotfish, etc., ** can secrete gelatin, which will become hard after encountering water, and drill into the bubble to rest, leaving only a small hole, so that it can also breathe.

4. Swimming and sleeping: There are also some fish with a relatively high metabolism, they must swim all the time to be alive, so they will not stop when sleeping, such as sharks, mackerel and tuna, etc., making it difficult to tell whether they are sleeping or awake.