Anonim

The great white shark (Carcharodon carcharias) is the most feared marine predator, the "eat-man" par excellence of the collective imagination since, in the seventies, Steven Spielberg gave us The shark, in fact. In reality, his usual menu is based on fish, cetaceans, seals and sea lions, turtles. In a hypothetical comparison, only the orcas (and men) are able to get the better. However, the experts confirm, all the deadly attacks on man are in fact attributable to him: this is his identikit.

Identikit of an involuntary killer. The great white shark is widespread in all the seas, except the coldest. It also frequents the Mediterranean, however only in some places like in California and in South Africa it is in great concentrations. The largest specimens can reach 6 meters in length and weigh up to a couple of tons, and it is long-lived: it can live up to 73 years.

He sees us well even in low light conditions and, just like the films show, he can jump out of the water to look at his lens.

Its bite is among the most powerful in nature, made deadly by formidable jaws and by about 300 teeth which, in adult specimens, can measure up to 7.5 centimeters. It has more rows of teeth, which grow one after the other: in this way, when a tooth is lost it is substituted by the one behind it - and the process continues throughout life.

The deadly shot. The caudal fin, moved laterally, gives it the push: it can swim at 56 km / h and jump out of the water, for example when it goes hunting for seals. The colors are perfect camouflage for its environment: white below and gray-blue above. Thus it is less visible from below (it merges with the light that comes from above), while from above it merges with the backdrop.

The lateral line is a sensory system that detects the vibrations caused by the movement of the preys. On the snout, there are receptors that detect electric fields. The skin is covered by flakes called dermal teeth, which make it abrasive: in other times it was even used to work wood.

The Mediterranean is frequented by 47 types of sharks. Alessandro De Maddalena, curator of the Italian White Shark Database, explains in Focus 311 that although fifteen species of sharks in the Mediterranean are known to attack humans, the chances of being attacked are so low that they shouldn't worry us.