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
Going on vacation to Egypt, it should be remembered that in the Red sea is home to many dangerous species of fish and shellfish and that your vacation turned into a nightmare, it is necessary to observe elementary safety rules.
One of the biggest predators – shark in the Red sea about thirty species. As a rule, sharks don’t attack people for no reason, not approaching the coast, but accidents still happen.
Very poisonous mollusk, the cone, seeing him, do not rush to grab hands. The venom of this marine life causes an immediate paralysis of the limbs, can occur stop breathing and anaphylactic shock. According to statistics, every third bite of the cone is lethal.
Starfish. Are about the size of one meter. It is beautiful, they have at their ends are sharp spikes. If you accidentally step on star, get a sharp prick and burning sensation. Continue reading
Katran – black (Squalus acanthias ponticus)
Reaches a body length of 2 m (usually 1.5 m). Found only in the Black sea waters to depths of 60 m.
Attention. All kinds of old-fashioned recourses are at the base of the dorsal fin spines small venom glands. When you shot the venom and mucus enter the blood stream and cause local poisoning, often accompanied by severe pain and inflammation.
The naked body is olive-brown above and whitish below. Leads benthic lifestyle, often buries itself in mud and sand. The predator, eats fish. Viviparous species. Body length is more than 1.8 m, weight about 20 kg. In our waters common in coastal areas of the Black and the southern part of the Azov sea common to the coast of Europe to England. The stingrays are very dangerous in water and outside of it (caught the bait, etc.) because they can cause serious injury to the poisoned needle. Known cases ended disability and even death of victims. Continue reading