The shark is a collective name. There is a white shark, blue, tiger, cat, soup, mackerel, shark-Fox, nurse shark, hammerhead shark. Scientists consider 350 species of these fish. And only 27 of them are accused of attacks on humans. And a few that occur only once.
Thanks to the joint efforts of marine biologists and divers-enthusiasts have managed to debunk some common misconceptions about sharks.
Myth: Most sharks eat people.
Fact: Of the approximately 400 species of sharks in attacks on people were seen a total of about 11. Most sharks are simply too small to pose a threat to humans. But a large white shark people are not too taste, although sometimes they mistakenly attack people, mistaking them for sea lions or seals, which are their favorite prey. Besides, they live at a depth where meeting people is unlikely. Although annually reported approximately one hundred cases of shark attacks on humans, actually elephants are being killed every year twice as many people (about 200) . Dogs kill thousands of people every year!
Myth: Sharks are stupid animals with small, primitive brain.
Fact: the sharks (as the rays) the size of the brain and body comparable to birds and mammals.The research was conducted, which demonstrated that the yellow shark learning is quicker and lasts longer than a cat or a rabbit. This, of course does not mean that sharks are as smart as birds and mammals, but still… Continue reading
Meat of marine fish has a specific scent which gives the product a special piquancy. The taste and smell of seafood due to the unique composition of extractives. In marine fish more than freshwater, so saltwater fish can be recommended for gastritis with low acidity, because it stimulates the appetite and promotes the secretion of gastric juice.
The main value of fish – easily digestible complete protein. Fish is digested in the human body within 2-3 hours. This can be explained by peculiarities in the structure of fish, namely a lower content of coarse connective tissue .
Products fish tender and juicy, that causes its widespread use in dietary and baby food.
The particular value of fish proteins is due to the ratio of amino acids. It has all the vital amino acids. A marine fish has a rather high content of amino acids: tryptophan, lysine and methionine. This brings it closer to its amino acid composition of ideal protein. Besides, it has advantages over animal meat protein, because it contains the amino acid taurine, which acts as a regulator of blood pressure, and thus prevents the development of hypertension. Taurine also stimulates the release of insulin, which regulates blood sugar levels.The most rich in taurine sea bass, cod, tuna and other oceanic fish.
Marine organisms are rich in valuable fats, which differ from fats of land animals. Fish oils have the ability to remain fluid at low temperatures than closer to the fat man, and therefore better absorbed. A very valuable property fat fish is low in cholesterol (20-30 mg %), therefore, the dietary addition of foods containing fat fish, rich in polyunsaturated fatty acids. which dissolve the cholesterol, significantly decreases the likelihood of atherosclerosis. Continue reading
Mammal from the order Cetacea, suborder of toothed whales. In Russia, dolphins are found in waters of the Black, Barents and Baltic seas. Dolphins moving predators that live in groups. They eat fish, mollusks, crustaceans. The dolphins have two jaws with a large number of identical teeth. The animal has a small head with a pointed muzzle. In most individuals there is the dorsal fin. In Russian waters, there are: Atlantic white-sided Dolphin, beaked Dolphin, black sea Afalina.
Atlantic white-sided Dolphin in the waters of our country dwells only in the Barents and Baltic seas. These dolphins prefer warm water, whose temperature varies from 5 to 15°C. they Feed on fish (herring, sand eels, cod, smelt) and cephalopods. In places where there are numerous schools of fish, there are up to thousands of dolphins.
The period of confinement of dolphins falls on may to August. The interval between births is 2 to 3 years. Young individuals are found near the mother for up to 2 years. Females in rare cases, live to be 27 years old, the average age of males is about 20 years. Currently the number of dolphins in Russian waters is not established. The pollution of the seas affects the inhabitants of the seas. Atlantic white-sided Dolphin is listed in Appendix 2 of CITES, Appendix 2 of the Bonn Convention Appendix 2 Berne Convention.
Beaked Dolphin – rare, almost neizuchennyi. He dwells in Russian waters in the Northern and Eastern parts of their range (in the Barents and Baltic seas). Body length is 2.5 – 3 m. the Exact information about the number of this type no. But it is known that beaked Dolphin is often found in the cold waters. Continue reading