Determine what the body of the fish is covered with. How the scales are located what is the importance

Determine what the body of the fish is covered with. How the scales are located what is the importance of such an arrangement of scales for the life of a fish in water.

The outer covers of fish play an important role. Scales, like a shield or chain mail, protect the body from water pressure and attacks from harmful and pathogenic organisms. Many species are completely covered by it, in some it is modified and develops in the form of bony formations. There are several types: placoid (rhomboid scales, sometimes transformed into thorns), ganoid (dense, often located in the tail (sturgeon fish) and bony scales (in carps or perches, it looks like rounded plates). Scales are located from head to tail, in the direction of the water flow, thereby giving the fish a streamline.There are several more functions: camouflage and aesthetic (attracting the attention of individuals).