Question

What are differences between the following:

Cartilaginous fishes and bony fishes 

Answer 1

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.