Sharks (lat. Selachimorpha) is a superorder of cartilaginous fish comprising eight teams, twenty families and about 350 species. Members of the superorder widely distributed in all seas and oceans, there are also freshwater sharks. Most species belong to the so-called real predators, some species, particularly whale, and giant deep-sea sharks, eat plankton.
For many millions of years before the planet appeared the first man, ruler of the prehistoric seas was a shark. The power of evolution sowed on Earth, countless forms of life that could not stand the severe tests and disappeared one after another, as the shark continued to exist. One prehistoric era is succeeded by another, have any amphibians, reptiles, birds, and mammals – the shark continued to exist. Pterodactyls – the winged reptile for millions of years plied the skies, disappeared from the face of the Earth. Dinosaurs-Triceratops, Brontosaurus, allosaurus and many other “saurus”, it is important chestvovali on our planet died out, leaving no trace. As the shark continued to exist.
About 20 million years ago in the sea scoured a huge Stingray, weighing over 100 pounds, and more than 25 different species of sharks, including sharks, reaching 36 meters in length. The length of these monstrous sharks was Opredelenie their huge teeth. Some of the teeth found in California, weighing 340 grams each and reach 15 centimeters in length, and seven – and ten teeth are quite common. They are triangular in shape and closer to the teeth of modern great white sharks that do not exceed 5-6 inches now with a body length of shark of 12 meters (maximum length). These teeth belonged to the ancestor of the modern great white shark the carcharodon, in huge quantities inhabited the seas. When they were first found in the seventeenth-century scientists, naturalists believed that this fossil bird tongues or teeth of serpents. They could not imagine that this shark’s teeth, and ascribed them to the mythical animal. Continue reading
White sea belongs to the basin of the Arctic ocean and represents a huge reservoir polutoratonny. Seas of this type are relatively few. Similar characteristics possess Black sea, the Mediterranean, the Baltic and Hudson Bay. White sea is the smallest of them. It is divided into two unequal parts – the Northern (outer) and southern (inner). They are joined by a relatively narrow Strait, also called the throat.
In modern times, few bodies of water that don’t pollute and the White sea is no exception. Anthropogenic pollution of the White sea began immediately after the occurrence on its shores of a man and eventually became so significant that the consequences can be observed today.
In a relatively short era of navigation, some areas of the bottom, especially in small lips, where it is convenient to stand during the storm, were so covered with coal slag, which still have not recovered destroyed the bottom biocenoses. These environmental problems of the White sea cannot be considered modern, though harm from them not less.
The woodworking industry has no less impact on the ecology of the White sea. Wastes at sawmill one keretsky industrialist, was filled in the Strait between the two Islands on which it is located.The forest industry is one of the key environmental problems of the White sea. Continue reading
The rest of the sea – the dream of almost every holiday maker! The Eastern part of Russia are used and forced to rest on the coast of the sea of Japan. It would seem that it can be dangerous in this region. However, on closer inspection, it was discovered the inhabitants, who simply need to know and to be particularly careful!
Let’s start with Yellow perch (trehpolosaya) — native of Japanese waters, it has quite a menacing look – the dorsal fin consists of 15 acute rays, the Gill slits are spikes, characteristic of the spotted-striped color…
Reach impressive sizes (up to half), but grow very slowly, reach sexual maturity at ten years of age! So what threat this slow instance of marine fauna? At the base of the spines on the fins and the Gill slits are poisonous mucous glands which secret, getting into the wound, causes a local and then a systemic poisoning of the body. Meeting with Yellow perch can seriously spoil your holiday by the sea. Symptoms: pain and inflammatory reaction, then, perhaps swollen lymph nodes. At the injury there is swelling, which could spread to the entire limb. Famous deaths.
In the injection – treatment of the wound with disinfectants and symptomatic treatment.
Further,it is worth mentioning jellyfish, let’s start with Lanei hairy . the largest jellyfish in the world, in the Guinness book of records registered the maximum size is 2.28 meters in diameter. So, typical signs: red umbrella (maybe raspberry or orange hue), the thickness of the umbrella is reduced to the edge, and the edge of the blade is transparent. The tentacle is quite long, divided into eight beams, form a kind of veil that protects the bodies underneath the umbrella. The hairy cyanea occurs in southern Primorye, mainly small individuals, in spring and early summer they gather in large clusters (up to one hundred meters of the field), there are instances of up to 60 centimeters… the Venom is contained in stinging cells on the tentacles, a single burn is not dangerous to humans, however with increasing dose of the poison received – there is a risk of allergic reactions. Continue reading