Question
Give differences between cartilaginous and bony fishes.
| S.No. | Cartilaginous Fishes (Chondrichthyes) | Bony Fishes (Osteichthyes) |
| 1. | They are always marine. | They may be marine or freshwater. |
| 2. | Skin is covered by small placoid scales. | Skin is covered with large cycloid scales. |
| 3. | Endoskeleton is cartilaginous. | Endoskeleton is partly or completely bony. |
| 4. | Gill slits are not covered by gill covers. | Gill slits are covered by gill covers. |
| 5. | Swim bladder is absent. | Swim bladder is present. |
| 6. | Tail fin is asymmetrical . | Tail fin is symmetrical. |
| 7. | Excretory matter is urea. | Excretory matter is ammonia. |
| 8. | They exhibit sexual dimorphism. | Sexual dimorphism is usually present. |
| 9. | Mostly viviparous | Usually oviparous. |
| 10. | e.g., sharks, skates. | e.g., Labeo, Catle, Hilsa. |
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