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Do fish sleep in an aquarium at night?

maintenance, care, compatibility

If we have an aquarium, then most often we watch the fish when we are awake: in the morning, in the afternoon and in the evening. And we don’t always think about what our pets are doing at night. But after all, all living creatures need rest and sleep, which means that it is also necessary for fish.

But how do you know that a fish is sleeping, because its eyes are constantly open? Let’s try to understand this question.

Getting into the embrace of morpheus, the fish do not close their eyes. After all, they have no eyelids, and water constantly cleans their eye surface.

However, the absence of eyelids does not interfere at all, since at night it is quite dark, and those fish that sleep during the day, specially swim to cover or shade the plants.

Fish that sleep can simply lie on the water, during which their gills will wash. Some can cling to the branches and leaves of plants. Other belly or side lay on the bottom.

Still others hang in the water column. In an aquarium, the sleeping fish most often drift at the bottom of the aquarium, making almost no movements, sometimes they can barely see the swaying tail.

But with any, even the smallest effects of external factors (be it a danger or potential prey), they instantly revive and return to their normal state.

Most fish do not have eyelids, so they cannot close their eyes. But does this mean that they are not sleeping?

The question of whether the fish sleep, it is easy to confuse even an experienced aquarium owner, not like an ordinary person. Most often this moment interests children, curious why.

So how do fish sleep and do they sleep at all?

One can understand that the fish has fallen asleep by the following signs: it froze in the thickets or other secluded place, hung in the water column. Some may even lie down, and some species prefer to relax on their side.

Most species of fish prefer to sleep in the dark, so if you come to the aquarium and turn on the light, you will be able to notice how its inhabitants return to their awake state, waking up. But there are those who rest during the day.

These are predator fish, for example, catfish.

However, fish dream is not the condition that is meant by this word in humans. How do fish sleep?

For them, this is not a state of complete relaxation and unconsciousness, as we do with you, but rather a process of slowing down the functions of vital activity. This allows the fish to quickly become active, if something dangerous or edible has arisen nearby.

The phase of deep sleep, in which there is almost complete loss of contact with reality, is absent in fish. However, during sleep, the nervous system and other functions of the body are restored.

Hang in the water column and drift during sleep can only fish that are of the type of bone. They manage to do this due to the presence of a swim bladder filled with air. The volume of air in this particular organ determines at what height the fish will be in the tank.

The smaller it is, the deeper it will sink into the water column. Most residents of home aquariums refers to the bone.

Ramps and sharks are cartilaginous fish, they have no swim bladder. How do fish sleep if they can’t hang in the water? They are laid on the bottom or rest while driving.

Antsistrusy and fights are considered cartilage fish suitable for keeping in an aquarium.

There are some underwater inhabitants who need to hide in a cave for sleeping. Parrot-fishes are sleeping very unusually – practically under a blanket. Only as it they use mucus, which is released by the fish through the mouth.

The mucus envelops the carcass, creating a protective cocoon in which you can safely rest and not be afraid of anything. In the morning, the fish leaves their “blanket”.

As the fish sleep, it is important to know not only to satisfy their own curiosity, but also in order to provide the fish with comfortable living conditions. Like people, they do not like, if they violate their regime, they may suffer from insomnia, therefore:

  • be sure to turn off the light in the aquarium at night;
  • pick up the fish so that they sleep at one time of day.

There are species of fish that sleep during the day and prefer thickets for this. If you put these in your tank, during the day it will look empty and uninteresting.

Many animals in nature and at home rest in different ways. Some — while standing, some — asleep or sitting asleep, some — afloat. Here, for example, have you thought about how a fish sleeps?

This cold-blooded one also needs rest, at least for a short time. An interesting question, you see, because no one has ever watched fish with closed eyes.

Why? Yes, because they have no century, and they simply have nothing to close them!

Ground animals are forced to moisturize, constantly blinking, the eye surface. And in a dream it is rather difficult to implement, since control over the reactions is lost.

Therefore, the eyes of mammals, for example, are closed at the time of sleep for centuries. Fish have a different story: they exist in water, so it is not necessary to constantly moisten the eyeball. But still they, like all animals, are forced to rest.

How the fish sleeps, we will tell in our article. And these representatives of the fauna world sleep differently, depending on the species and habitat.

During their holidays, many of these cold-blooded species become almost immobile. They, as a rule, have a rest in the bottom area.

This applies to many large river and lake species. But the statement that every fish sleeps at the bottom will not be entirely true. Some oceanic fish species must be constantly in motion, even while sleeping.

These include, for example, sharks and tuna. Water must constantly pass through their gills, otherwise they may suffocate.

Therefore, tuna lay down on the water against the stream and, thus, swimming, rest. And sharks – these contemporaries of dinosaurs – are completely missing the bubble that other species of fish have.

This fact is another argument to be in motion, even during rest. After all, otherwise the shark will simply sink to the bottom and, in the end, no matter how funny it sounds, it will sink!

And also – stingrays and sharks do not have lids on the gills, like many bony fish, so the water goes there only when the fish is moving, and you can sleep relatively calmly, as the bony do, they don’t work – you need all the time somewhere to swim.

The position in which the fish sleep is largely dependent on the species. For example, an astronotus is hanging upside down. A clownfish at the bottom of the aquarium is laid on its side.

Some aquarium fish just hang in the stillness.

How does a fish sleep? In natural conditions, the provisions for its recreation can also be very different. Flounder digs into the sandy soil at the bottom.

Cod sleeps lying down. Herring – and at all up the belly, floating down the stream.

Most of the bottom fish sleep in secluded places, previously prepared among the rocks and crevices, corals and algae. A parrot fish envelops itself with a cocoon of slime to become invisible to the predator.

How many fish sleep? Most fish, like many animals, are active throughout the daylight hours. With the onset of darkness, life stops, it is time to rest.

Therefore, for example, it is so important for fish kept in aquariums that reasonable respect for their natural regime. Agree, if you wake up at three o’clock in the morning with bright light and noise, you can hardly like it. The same goes for fish: you need to turn off the artificial lighting of the aquarium in the evening and at night, so that the animals can rest.

Otherwise, the life span of aquarium fish can be significantly reduced.

It is characteristic that some river predatory fish (for example, catfish or burbot) do not sleep at night. They prefer to hunt, and during the day – to rest. However, among the fish, leading a daytime lifestyle, come across those who like to arrange a siesta in the middle of the day.

But dolphins (mammals, which were previously classified as fish) never sleep at all! The hemispheres – the left and the right – the dolphin’s brain rest alternately (each approximately 6 hours).

The rest of the time both hemispheres are awake.

So, you have an aquarium and you are overwhelmed by a whole host of questions regarding its maintenance and care for the inhabitants. One of the main issues requiring careful study and attention is strangely the question of lighting.

Light plays an important role in maintaining the life of plants and mollusks. But the fish do not need it.

It is also recommended to adhere to natural lighting.

And of course the question arises whether the lighting is necessary in the dark. Of course, the choice remains for the owner of the aquarium and the fish living in it.

Earlier, when there were no different innovations in the world of fish keeping and aquarium arrangement, small round specimens were used without any kind of lighting.

How much light is needed in an aquarium is determined based on natural indicators. It means that in the natural habitat of course there is no such amount of light as from lamps, and nevertheless the fishes feel absolutely comfortable.

In winter, however, an extremely small amount of light enters the water.

Therefore, the intensity of illumination is determined from the fact that it must be in the soft ultraviolet spectra and have colors from red to blue. Do not neglect to turn off the lights in the night as the fish need to sleep and feel that they do not have an eternal day in order for all the biorhythms to be normal and to function as it should be and laid in them by nature.

It is not necessary to leave the light in the aquarium at night, because, as is well known, most of the light is necessary for the growth of living plants in the aquarium, at night, plants do not need to synthesize light. In the marine aquarium where corals grow light, synthesized into chemical energy by the smallest plants that usually grow in corals, you also do not need to highlight the bottom at night.

So, whether it is a fresh or salty aquarium, it is not necessary to illuminate it around the clock. And if you need to leave the house for a few days, then in this case you can turn off the backlight without harming the inhabitants of the aquarium.

Therefore, quietly turn off the backlight and do not worry about the fact that the aquarium will stand for a few days in the dark on the natural light in the living room or office.

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