The active exploration of the underwater world started relatively recently — in the middle of the last century. For this purpose it was necessary to invent the sonar, scuba, submersibles… How many surprises were in the depths of the sea! The diversity of life forms is staggering. Before you ten most charming, strange, scary and rare fish, which were found to mankind.
Hairy monkfish. Opened in 1930. Very strange and scary fish that live deep at the bottom, where there is no sunlight — 1 km and deeper. To lure the inhabitants of the deep sea uses a special glowing growth on the forehead, around the characteristic detachment udenstvertne. Due to the special metabolism and extremely sharp teeth he can eat everything that comes, even if the victim is at times more and is a predator. Propagated by no less strange than it looks and feeds — due to the extremely harsh conditions and the rarity of the fish, male (ten times smaller females) is attached to the flesh of his lady and all the necessary transfers through the blood.
Plasence. Opened in 1884. These sharks are superficially much more like a strange sea snake or eel than his closest relatives. The frill-neck shark Gill openings, of which there are six on each side, covered with skin folds. Along with the shark-brownie is one of the rarest sharks on the planet. Known no more than one hundred ekzemplyarov fish. They studied very poorly. Continue reading
This term there are other uses, see Shark (disambiguation) .
Sharks (lat. Selachii )  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  .
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
Today, rural life has become more comfortable and enjoyable, and increasingly instead of slender beds of potatoes, carrots and tomatoes on the site there are various facilities for a pleasant stay. One of the fascinating and practical practice is the cultivation of fish in ponds. And if you are also thinking about how to make a pond for fish with your hands, you should learn the basic ways of realization of this idea.
The basic rules
In order to properly make a pond for fish farming, you must consider some tips:
• Be aware that for small-sized reservoirs need serious care, and the facility is very large ponds is quite expensive. Therefore, the optimal size of the reservoir for fish are considered the parameters within 25-50 sqm
• To create a pond for fish suitable outdoor area, so that during the day part of him was illuminated, and the second in the shade. Do not place the pond in low-lying parts of the site, otherwise avoid its flooding.
• The topography of the pond for the fish should be a complex of alternating shallow and deep sections with ledges and rapids, built at different depths. Continue reading