Shark is considered the most terrible in their bloodlust marine predator. But it is justice. Such an enemy sharks are dolphins. Why was the shark afraid Dolphin, although their size sometimes exceeds them?
There is a theory that because the shark flees at the sight of a Dolphin that is trying to save his life. Dolphins live in packs, and many testimony and research have their own mind, yet incomprehensible to the people. If they don’t bother people, but on the contrary always help them, it does not mean that soft dolphins are harmless creatures. They are perfectly able, to defend and attack. Dolphins at high speed, beat the shark with its nose in its belly or in the gills . this is the most vulnerable place of the predator. But great speed and a powerful blow to the nose of the Dolphin can be deadly for sharks. At the sight of aggressive sharks attack dolphins and beat it until it is destroyed. If the shark in time will be able to escape, you will not lose a life. This war sharks with dolphins is observed quite often, and the shark is not attempt attacks on people, no matter how hungry, if there are dolphins. Tell you that there have been instances when dolphins to death zabolevanii-nosed porpoises. And it’s not in hunger, dolphins are not by nature bloodthirsty. Continue reading
In honor of the coming of the pores of the holidays we offer to your attention a selection of interesting facts about the Black sea.
The first mention of the Black sea are found in documents relating to the V century BC. It is on the Black sea, Jason and the Argonauts went to Colchis for the Golden fleece.
1. The ancient Greek name of the sea — Pont Aksinsky (gr. Ἄξενος Πόντος), meaning “Inhospitable sea”. It is assumed that the sea was named so because of difficulties with navigation. Later, after a successful exploration of the coast by Greek colonists, the sea became known as the Pontus Euxinus (gr. Εὔξενος Πόντος, “Hospitable sea”). Romanian Black sea Marea Neagră is called.
2. A characteristic feature of the Black sea is complete (except some bacteria) absence of life at depths greater than 150-200 m. the fact that the deep layers of the Black sea is saturated with hydrogen sulphide.
3. In the scheme of currents of the Black sea there are two huge closed cycle with a wavelength of 350-400 km In honor of oceanographer Nikolai Knipovich, who first described this scheme, it was called the “Glasses of the Knipovich” Continue reading
Perciformes (lat. Perciformes) — a detachment of the class of bony fish. There are over 6000 species and about 150 families. Characteristic features: part fin rays has the form of undifferentiated acute spines, pelvic fins are usually located under the breast and sometimes in front of them; swim bladder not connected with the intestine.
The squad is part of the Perch family (Percidae), with 160 species, many of which have important commercial value. In particular, the Zander (Lucioperca), several species of which live in the basins of the Black and Caspian seas. Some of them live permanently in rivers, others in the seas, others are semi-anadromous fish coming from the rivers into the sea. Perch (Perca) are widely distributed in the rivers and lakes of Russia. Are also objects of the fishery.
The family of Labyrinth fishes (Anabantidae) is a kind of fish, characterized by the presence of saccular outgrowths of the Gill cavities, which are used for temporary breathing air. These fish, such as anabas (Anabas testudineus), often come out to shore and even climb trees. They live in fresh and brackish waters of tropical Africa, Asia and the Islands of the Malay archipelago. Some species, such as gourami, are used as aquarium fish. Continue reading