Ordinary bony fish is the largest class of fish. This class can be divided into two groups according to the fin structure, ie finned fish lobe and finned fish fan. Both of these groups have the usual skeletal framework, twin fins and the center fin. Her skin is generally covered by a thin round scales, lithe and boned. The number of de-retan scales indicates the age of the fish. On both sides of the header can the gill cap cover to protect the gill cavity containing five bow gills. Although some primitive boned fish have lungs, in most of them the lungs have been transformed into bubbles. Fish eyes are generally located on both sides of the head so that the angle of view is wider.
In most species of bony fish the egg is exposed outside the body. The eggs hatch into small fish children who usually eat egg yolks attached to their stomachs, until the child is ready to feed themselves.
