marine

Dangerous and harmless shark

When you hear the word “shark” we present a huge toothy fish, predator and ruthless killer. But, it turns out that among 350 species of sharks are not dangerous more than 50 species – the other sharks are quite harmless. Many sharks are fairly small, not more than two feet long, and only attack clams and crabs, and the largest sharks in General are confined to the plankton.

Sharks belong to the cartilaginous class of fishes. Sharks superorder includes 8 units and approx 20 families. All sharks are carnivorous, and most of them are predators. Sharks can live in the open sea and hunting on mammals and large fish, and can live near the seabed and collect benthic animals. The difference in lifestyle gives rise to the difference in appearance. “Shark” appearance sharks are from the family of Requiem sharks: blue (3.8 to 6 m) and soup (2 m) sharks, as well as the setting in water of Mediterranean mackerel shark and shark-Mako 2 (3,4-4 m) from the squad of lunoobraznogo.

Blue and soupfin sharks are kept open sea and hunt for fish and cephalopods. Blue sharks often accompany court Pobjeda thrown overboard the waste. It is believed that the blue shark dangerous to humans, but as in the open sea, where it is more usual, little swimmers, and attacks are infrequent. Ethanol is much more dangerous to the man himself. Both of these sharks are the target species, and shark fin soup cook a delicious soup. Sharks-Mako, on the contrary, very dangerous. Aggressive and armed with several rows of razor sharp teeth, they often attack boats in the open ocean and swimming up close to shore to attack swimmers. Continue reading

The greatest myths of modern times, Sharks
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"Calypso" and the corals", Jacques-Yves Cousteau
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