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There are about 1200 species of catfishes that are divided into 31 families and 150 genera. Typical external characteristics, distribution, conditions of keeping and feeding of catfish, will be discussed…

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Pets in the urban jungle – do fish Sleep in an aquarium?

Do fish sleep in an aquarium?

What do fish in our aquarium in the afternoon — we can check at any time. And that’s what they do at night when we sleep? You probably haven’t even thought about it, but they also sleep.

Actually, the biological functions of the body fish are very different from mammals. Because of this, owners of aquarium fish is often not familiar with how it works internal organs their underwater Pets.

So, do fish sleep? Yes and no. They are “asleep” in his own way, not the usual way for us. That is, at the time of “rest” they produce a certain type of activity that we call sleep.

People spend in sleep on average eight hours a day. This is equal to approximately one-third of all human life. For humans sleep is a period of time in which our heart rate and breathing decreases, relaxes muscles and a period of inactivity. “Sleep” in animals is defined in the General Veterinary Dictionary as “…a period of rest, during which suspended physical function and reduced sensitivity to external factors”.

Thanks to the experts-zoologists we also know that different animals experience the “sleep” differently. But in fish it happens in a different way. Although, while resting their perception of the environment is also significantly reduced.

“Sleeping” fish.

Fish do not fall into a completely unconscious state, in which they completely stopped osoznavat around. Brain activity of most fish remains almost not changed, which means that they are not able to fall into a dream R. E. M (deep sleep). During his “sleep” usually the fish is drifting without active movement at the bottom of my aquarium and immediately returns to a normal state at the slightest impact of any external factor .

I’ve always noticed that my aquarium inhabitants can very long remain almost without moving, only barely perceptible shaking tails. But as soon as someone closer to the glass, without even touching him, not including the dramatically light or anything else — they come alive again and begin to swim around the aquarium as if “I was just there and went”.

Winter “hibernation”.

Certain species of fish, there are special periods in the cold season, when they “hibernate” which of course differs from the usual understanding of that term. But still. This cycle of “sleep” is accompanied by the inactivity of the fish, reduction of metabolic processes in the body, slowing down all physical functions.

Although, again, this is different from the inaction that animals or people. During this period fish either hide, or abide for a while in the lower layers of its environment — at the bottom of the aquarium or pond (when it happens in the wild).

Summer “hibernation”.

There are some fish that fall into summer “hibernation”, a period of heat. This helps them to protect themselves from dehydration. This is a very interesting phenomenon, as it actually allows the fish to survive outside water during a drought or just too high of temperatures.

In Africa there is even a type of fish that is wrapped in a kind of “cocoon” of mud and spend a few months in a state of complete rest. Aquarium fish rarely resort to such methods of self-preservation, but may remember them if their environment demands it.

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