Dangerous predators such as sharks – Animals and nature – Hobbies – Business-article – Search portal KOMPASS Ukraine
Shark is one of the worst enemies of a man of the sea. The shark is cruel and ruthless hunter, she attributed various unimaginable properties. The shark is one of the main characters of myths and legends of the peoples inhabiting the Polynesian Islands and the Hawaiian archipelago.
But with time and the development of technological advances, the sharks became the hunted. A prerequisite for this is that the shark fin soup and the liver is attributed to the properties of a panacea. Plus, a man takes revenge for the fact that some sharks are man-eaters.
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.
Classification of sharks
Sharks belong to the superorder of cartilaginous fish that includes eight teams, twenty families and about 350 species.
Whale sharks are the largest of all the sharks. Their length reaches to 20 meters and weight up to 20 – 25 tons. However, despite such impressive sizes, the whale shark feeds exclusively on plankton and small fish, which she sucks together with water. This method of feeding due to physiological characteristics of the shark – its teeth are not designed neither to crush nor to write nibbles.
Representatives of these sharks is most similar to the ancient ancestors of all sharks. Sixgill sharks are virtually indistinguishable from prehistoric sevengill, the remains of which were found in fossilized form. The average size of these sharks are approximately 6 meters weight up to 700 kg.
Some believe sand sharks most dangerous to humans. Particularly distinguished himself in the attacks on people the grey nurse shark. The length of this shark comes up to 4.5 meters. Sand sharks are very well armed both for the defense and for attack. For a long time these externally slow-moving creatures are considered to be very dangerous for swimmers. Fishermen, too, often suffer from sand sharks are caught in nets.
For a long time these sharks were thought to be extinct. So nothing specific about them is virtually unknown. The biggest instance of a well known scientist had reached a size of 5 meters. Presumably these sharks live in the deep places near the coast of Japan, Portugal and Denmark.
The porbeagle is usually divided into three families. The most famous of these sharks is the Great white shark. A distinctive feature of this torpedo-like creatures are huge jagged teeth wedge-shaped, sometimes reaching 5 cm in length. The great white shark is the perfect killing machine. The greatest number of attacks on humans shark made of this type. However, despite such a reputation, the Great white shark, very little is known. For ichthyologists still remains a mystery her life.
Nearest relative of the Great white shark have a shark Mako. This is one of the fastest and strongest sharks. When you size up to 4 m Mako weighs about half a ton. The shark is a highly developed fighting instinct, Mako is often attacked by the swordfish that does not risk to make any sea-dweller.
Basking sharks are considered relatively safe for humans, as these sharks feed exclusively on plankton. These viviparous fishes reach a length of up to 20 meters. These sharks are found in temperate Northern latitudes.