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. Continue reading
The tiny freshwater polyp Hydra long been of great interest to scientists. In many respects it is connected with the fact that this animal is actually immortal and shows no signs of aging.
From a biological point of view, an unusual phenomenon is explained by the fact that Hydra reproduce by budding and possess impressive abilities to regenerate all areas of the body due to the presence of a large number of stem cells. With age, the number of “miraculous” cells is not reduced, and they continue to renew the tissues of the body.
German researchers from the University named after Christian Albrecht (Christian-Albrechts-Universität zu Kiel) decided to find out what are the genetic basis of immortality of Hydra, and was surprised to find that the secret lies in the gene FoxO.
It is well known to geneticists, as there is in all animals and humans. Biologists have also proven that it is associated with aging. However, its role still remained unclear. Continue reading
Fish-LiveDrive our rating of the most unusual inhabitants of the deep and dangerous at the same time, amazing lionfish, also known as striped lionfish, or Zebra fish. This lovely creation is long about 30 inches most of the time among the corals in a stationary state, and only from time to time, swims from one place to another. Thanks to the beautiful and unusual color, and long fan-like pectoral and dorsal fins of this fish attracts attention, both people and marine life.
However, for beauty of coloring and shape of her fin and hidden sharp poisonous needles, which it protects itself from enemies. The lionfish does not attack first, but if a person accidentally touches it or steps on it, from one injection that needle he has dramatically worse health. If there will be several injections, the person will need outside help, to swim to shore, because the pain can become unbearable and lead to loss of consciousness. Continue reading