Not every adult will answer the question of how fish sleep. Yes, and think about it a few. But children are often interested. Find out the details of fish sleep is also for those who are going to buy an aquarium. And this article is useful to those who like to learn something new about the environment.
The most common myth associated with the dream of fish is generated by the structure of the organs of vision of most inhabitants of the underwater kingdom, which is unusual for humans. A man used to close his eyes to fall asleep, got used to sleeping cats and dogs with his eyes closed. In the case of fish, nothing like this happens. They never close the century. Therefore, questions about how fish sleep, many are puzzled, causing a strong desire to immediately answer: "No!"
Everyone knows that people and other dryers close their eyes so that the mucous does not dry out during sleep. But why this function to the fish, in which under water nothing will dry out for sure? That is why they are deprived of their eyelids and do not close their eyes even in a dream.
The second misconception concerns the behavior of fish during the rest, not like ours. Here, for example, an aquarium. When you look, and there everything is the same: frisky danios frolic around the clay castle turrets, plump catfish busily digging around in the ground, looking for food leftovers, a handsome telescope swims slowly, waving luxurious tails of fins someone exposes the sides to a stream of water from a compressor, surrendering to the power of the waves. Hence the question: do the fish sleep in the aquarium at all?
Postures and movements
In fact, fish, like all other living creatures, need a rest. Just their dream has features. Physiological processes slow down, decreases brain activity. This is enough for them; a complete “shutdown” is not necessary for most fish.
An attentive host probably knows how to sleep fish in an aquarium. If you look closely, it can be easily noticed. Most fish go into a small list, rolling over on their side. Some lower their heads down. But the somae of the Clariuses, for example, “stand” on the tails almost vertically (by the way, the sperm whale is sleeping in a similar position). A common symptom of sleep, characteristic of most fish, is a complete cessation or at least a marked decrease in motor activity.
How do fish sleep in a sea-ocean? Approximately the same, drifting in the water column, lay down on its side, hiding in the algae. And the herring turns its belly upside down and rests on the surface itself.
But there are some exceptions. For example, sharks and rays. cartilage fish. Unlike bone, they do not have an air bubble, thanks to which it would be possible to stay on the surface. Therefore, like cetaceans, they have a risk of drowning (however strange it may sound!)
Sharks drift in the water column, periodically assessing the depth and, if necessary, rising. Their superficial sleep, they are always ready not only to rise to the surface, but also to notice a threat or a potential dinner floating nearby.
Having figured out whether fish sleep at all, it’s worth understanding how and where they like to do it. Of course, there can be no bed in the usual sense. But some fish make some nests.
For example, a parrot (pictured below) envelops itself with mucus. Grains of sand stick to it, which makes the cover even more dense. In such a reliable shelter, this fish can completely relax and unwind.
The clown fish in the evolutionary process developed a defensive reaction to the burning tentacles of anemones. For other inhabitants of the underwater kingdom, these thickets are destructive, and the white-orange kids have managed to make friends with them and are using their powerful force for their own protection during sleep.
Flounder asleep, buried in the ground. However, in this position, it is often awake.
Some aquarium fish love to sleep among the branches of algae and underwater plants.
Depth and duration of sleep
Knowing how the fish sleep, you can provide them with the desired mode in the aquarium. After all, no one is pleasant loud sounds and excessive lighting during sleep. Most of the fish are asleep, and they need a split second to wake up. But some are plunged into a rather deep sleep, they can even be touched.
Sleep fish in fragments. They wake up and fall asleep again. But for most species, a preference for a particular time of day is characteristic.
What you need to know a novice aquarist?
Picking up pets, it will not be superfluous to think about how fish sleep in an aquarium. If you are going to place it in a living room, it is hardly worth populating it with fish, the activity of which falls at night. First, in the afternoon such an aquarium will look pretty boring. And secondly, some large fish are able to create quite a lot of noise, crawling in the ground and undermining the decorative elements. Knowledge of the daily routine of pets will help a novice aquarist to choose the most suitable fish.