scientists

Treacherous sea killer

Us always attracted by exotic countries and Islands, with white beaches and clear warm waters. But you have no idea how dangerous can be your next swim. Speaking of danger, we immediately imagine a shark with a huge jaw, and strive to swallow some of the diver. Meanwhile, a greater threat are they, and little marine killer, which at first glance is completely harmless. At the moment scientists can name about 500 species of poisonous fish, 93 species no less venomous coelenterates, echinoderms 26 species and 91 species of mollusks that await bathers in the coastal zone.

Among Russian tourists very popular Red and Mediterranean seas. In them there are sharks, stingrays and poisonous fish. But, as a rule, they avoid coastal areas and customers can be calm. As for the Chinese Islands, the Atlantic and Pacific oceans and other seas, oestrogenicity. Since we are not talking about huge terrifying marine predators, and about nondescript or Vice versa incredibly beautiful creatures, which at first glance does not come any danger.

One such fish is the stonefish or verrucosa . It rightly can be attributed to marine killers. Borodavchenko difficult to see as it really looks like stone. All the body of the fish is covered with scales and bumps and growths. Sometimes it can decorate brown stripes and spots. The stonefish is rarely more than 20 cm long, it has a disgusting big head, small eyes and a large mouth with massive, jutting jaw. From the dorsal fin sticking out poisonous thorns. Killer loves to dig in the sand, so a diver could easily come to fish and to prick of thorns. Continue reading

What is a Shark?

This term there are other uses, see Shark (disambiguation) .

Sharks (lat. Selachii ) [1] is a superorder of cartilaginous fish ( Chondrichthyes ) belonging to the elasmobranch subclass ( Elasmobranchii ) and has the following distinctive features: elongated body, more or less torpedo-like shape, large heterocercal caudal fin, usually a large number of sharp teeth in each jaw [2] .

Skeleton

The skeleton of sharks is markedly different from the skeleton of a bony fish — it has no bones. and it is fully formed from cartilaginous tissue. In the skeleton there are the following departments:

Axial skeleton — the spine. educated numerous ampicillinum cartilaginous vertebrae ;

The skull with two divisions — the brain box and the skeleton of the mouth and Gill apparatus;

The paired appendages and girdles — pectoral and pelvic fins ;

Unpaired fins are, as a rule, caudal, anal and two dorsal fins. Continue reading

Dolphins of the sea of Azov

The United Nations is concerned about the high mortality of dolphins in the Black and Azov seas and intends to draw attention to the protection of the mammals that are on the brink of extinction. Therefore, 2007 was declared the year of the dolphins.

In the natural world none is more mysterious creature than a Dolphin. The ancient Greek myths has preserved the story of how these inhabitants of the sea have saved the Orpheus. But perhaps little real evidence of the miraculous rescuing person from the sea depths of these noble, do not dare to say, animals?

On the basis of experiments, scientists have concluded that intelligent action is the closest to humans are dolphins. They are faster than other animals to train. Dolphin “language” includes 110 audio expressions. It is a kind of a grunt. hissing, whistling, buzzing, squeaking, rolling in the ultrasonic range.

Dolphins, like other cetaceans, is equipped with sonar that allows to navigate in the water column, to avoid underwater obstacles and locate prey. Precision locators dolphins is that they are at a distance of 25 meters distinguish the bullet that had fallen into the water. However, the biological locators sometimes fail, especially in a storm when the water is polluted with sand and silt, saturated with air bubbles. This can lead to disorientation and death. In addition, delpinova sonars can detect Gill nets, made of nylon, getting to them, animals perish. Continue reading

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