Discus fish care: how do they sleep?


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So do the fish sleep? Both yes and not. They “sleep” in their own, utterly differing from ours, way. To be more exact, when “having rest” they perform definite activities which, particularly, we call “a dream”. “Dream” is a period of rest, during which physical functions are held up and sensibility to external factors is decreased.

Eating discuss fish is usually very attentive

So do the fish sleep? Both yes and not. They “sleep” in their own, utterly differing from ours, way. To be more exact, when “having rest” they perform definite activities which, particularly, we call “a dream”. “Dream” is a period of rest, during which physical functions are held up and sensibility to external factors is decreased.

Eating discuss fish is usually very attentive

Thanks to experts of zoology we can also know, that different animals experience “dream” in different ways. And as for fish, it goes on in utterly different way. Though, their perceiving of the environment reduces considerably as well.

Grey discuss fish seems to be rather hungry

“Sleeping” fish

Fish do not sink into absolutely unconscious state in which they would wholly stop realizing the world around. Brain activity of the majority of fish remains almost the same, and it means, that they are not able to fall into deep sleep. During its “dream” fish usually drifts without active movement on the tank’s bottom and promptly returns to its usual state under the influence of any external factor.

Large discuss fish is really beautiful

I have noticed many times, that my tank fish could stay almost motionless for very long time just slightly wagging their caudal fins. But if only somebody approaches the glass, even not touching it and not switching the light on abruptly or something else – they become animated and start swimming all over the tank as if it “was that exact direction it wanted to swim”.

Leopard discuss fish is a slow creature

Winter “hibernation”

Some fish kinds have special periods in cold seasons, when they “hibernate”, but of course in a way which differs from the customary comprehending of this term.  But nevertheless. This “dream” cycle is accompanied by fish inertia, reduction of metabolism processes in its organism and slowing of all physical functions down.

Ordinary discuss fish is able to live in any tank.

Though it differs from the inertia, which is inherent to animals or humans, of course.  During this period fish either hide, or stay temporarily in lower layers of their habitat – on the bottom of a tank or a pond, if this happens in wild nature.

Pale discuss fish is not very popular now.

Summer “sleeping”

There are some kinds of fish, which “hibernate” in summer, in hot weather period. It helps them to save from dehydration. This is a very interesting phenomenon, because it actually enables fish to survive outside water during drought or extraordinary high temperatures.

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