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Sharks are cartilaginous fish chondrichthyans ie its skeleton is made of cartilage rather than hueso.La shark's skin is formed by a kind of scales known as dermaldenticles. Another function of this very specific skin is to act as a silencer, since water is distributed inside the slits and not outward, thus limiting friction against thewater, improving the mobility and speed, and also causing thedisplacement is much more silencioso.El gestation period lasts at least eight months, but can be extended to 16months. The female is between 15 and 31 pups per litter, which measure from 42 to 55 cm long at birth. What you eat a shark also depends on where you live, this exchange theother types of creatures that are around them which can be eaten by sharks escoger.Lo has evolved on the basis of what is offered for them to survive. As mentioned, thesharks are easily adapted to their habitat, so the number and variety of food choices will determine what a shark will eat there. Sharks may prefer certain types of food, butwhen they are scarce, adjust your diet to compensate. Some shark species live 20 to 30 years. There are over 360 different species or types of sharks in the world,classified in 8 different orders, described below with some examples of species or types known to each group. Mostly in warm seas, Australia, Central America, Mexico and Belize, butthere is a freshwater species that lives in Lake Nicaragua lostiburones The main enemies of tiger and other shark in the ocean are humans.Overfishing of sharks tigerpopulation has declined drastically.
Of these sharks have become popular foods or pills that make it valuable for fishing, besides humans usually just hunt sharks for sport.