Fill in the table “Comparative characteristics of the main groups of fish”.

Class name Name group Characteristic signs Representatives
Cartilaginous Shark Flattened head, powerful teeth, no scales Tiger shark
Stingrays Flattened body, bottom organisms Electric Stingray
Bone Sturgeon They live in salty sea water, have a slightly flattened head, an elongated nose Sturgeon, sterlet, beluga
Salmon The body is round, laterally compressed, have large round scales Salmon, pink salmon, chum salmon
Cod They have a small head and a light stripe running along the body. Burbot, pollock, pollock
Kistepery Large powerful teeth, the fin has a five-membered structure Coelacanth
Dipnoi Have both gill and pulmonary respiration Horntooth
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