Do all fish spawn?
Most fish lay eggs, and it is fertilized outside of their body. Fish that spawn, are called oviparous. But some fish give birth to live fry. Such fish are called…

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Directory of commercial fish
Centrolophidae - Stromateidae – Perciformes Seriolella porosa, Seriolella punctata Silver warehou, Savorin length: 67 cm; weight: 3 kg (average 500g); the production season: in bycatch, almost all year round. Habitat…

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Aquarium fish catfish
This species belongs to the family of Armored catfish, Callichthyidae or Kalligrafie This family is included in the squad SOMO-shaped (Siluriformes). Members of the family — small fish that live…

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How do you sleep aquarium fish?

Watching fish in an aquarium, you’d think they never rest or sleep. In the understanding of man, they are in constant motion. However, like all animals, fish periods of active behavior alternate with phases of slowing of physical functions – this is the dream fish.

Dream fish is different from our understanding of sleep. Structural features and habitat not allow the fish to fall into a state in which they would be completely disconnected from reality. In such a state is immersed most mammals during sleep. The fish also during sleep, the brain activity remains unchanged, – they are not able to fall into a state of deep sleep.

This feature and may cause the issue: how do aquarium fish sleep?

Studying the behavior of aquarium fish, you will notice that at certain times the fish are almost motionless, transfixed in the water. This is the sleeping fish. During sleep, the fish usually drift without active movement. But the slightest influence of external factors leads fish into an active state.

Some fish can hide or be on the bottom of the aquarium.Many species of fish are fixed on the algae during sleep. There are fish species that fall into a condition similar to hibernation: at this time all physical processes in the body slow down the fish, and the fish are inactive.

In the dream state the fish continue to operate in different hemispheres of the brain. Therefore, despite the slowness of the process, the fish remains in the mind. At the slightest danger the fish may move to the active state.

Answering a question, whether fish sleep, you need to consider the difference in understanding of sleep in fish and other animals. Most fish remain active, slightly slower, but in the mind. They quickly go from sleep state at the sight of danger or at the approach of suitable prey. The fish there are periods of activity and rest, but the fish are not in an unconscious state, like other animals.

Bothers to see what fish are asleep, and that they can’t close their eyes. The fish do not have eyelids, so their eyes are always open. Eyelids fish do not need as clears the surface of the eyes of aquatic life the water itself.

Each breed has its time to sleep. Some fish (mainly predators) sleep during the day and are awake at night. For example, catfish hide during the day and are active at night hunting.

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