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प्रश्न
What are differences between the following:
Cartilaginous fishes and bony fishes
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उत्तर
| Cartilaginous fishes | Bony fishes |
| 1. They have a cartilaginous endoskeleton. | 1. They have a bony endoskeleton. |
| 2. They contain 5-7 pairs of gill slits. | 2. They contain four pairs of gill slits |
| 3. An operculum is absent in them. | 3. Their gill slits are covered with an operculum. |
| 4. Their mouth is ventral in position | 4. Their mouth is terminal in position. |
| 5. Their caudal fin is heterocercal. | 5. Their caudal fin is homocercal. |
| 6. Swim bladder is absent in them. | 6. Air bladder is usually present in them |
| Example. Indian shark, electric ray, etc. | Example. Carp, sea horse, etc. |
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