Home page » Type of fish » How many exists types of fishes?

How many exists types of fishes?

Fishes have appeared on light long before the person. Evendinosaurs, elephants and other animals cannot argue with fishes in thisquestion. So fishes - the very first vertebrate animals on our planet.
As well as all the alive essences living on the ground notone thousand of years, fishes not time changed. Now they are the most numerous representatives of a class vertebrates . Them it is totaled, at least, 30thousand the types living in the deep-water saltwater, in fresh-water lakes, inponds, in mountain streams. All fishes conditionally divide into three types.The first is cartilage fishes(slopes, sharks), that is fishes with cartilagea backbone. They have strong, thick, but without scales a leather.
The second type are bony fishes, with not cartilage a backbone and a scalyleather. Perhaps, this type the most numerous.
The third type - the fishes having both lungs, and gills.All pulmonary fishes live only in fresh water. Their fins very much remind finitenesses of animals, therefore such fishes as, for example, a special kindof the perch, are capable to leave sometimes on coast.
But the majority of fishes breathe by means of gills. Andstill fishes - cool animals, at them are nervous system, therefore, as well asall alive essences, they can feel pains.
In addition at fishes touch is very developed. They can not only feel as a leather external subjects, but also define their flavoring qualities. Bodies of sense of smell are in nose apertures on a head. Ears atfishes are located inside of a body.
Fishes never conduct a settled way of life. Similarly toground animals, like to gather in jambs. The majority of them - predators, eator other fishes, different inhabitants of the seas and the rivers, or insects.