Table
Fishes are of two types
| Chondrichthyes | Osteichthyes |
|---|---|
| Cartilage fish with ventral mouth and heterocercal tail fin. | Bony fishes with terminal mouth and homoceral tail fin |
| Gills 5-7 without the operculum. | Gills are 4 pairs with operculum. |
| Swim bladder is absent. | Swim bladder is present. |
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