Question

Is a puffer fish a cartilaginous fish?

Answer 1

Fish:

These are aquatic limbless organisms that survive in water and breathe with the help of lungs.

Based on the skeleton fishes can be categorized in two categories:

1. Cartilaginous fishes
2. Bony fishes

Cartilaginous fishes:

1. Their skeleton is made up of cartilage rather than bone. C
2. These fishes belong to the class Chondrichthyes.
3. These have separate gill slits without the operculum which is the gill cover.
4. Their skin has a covering of placoid scales.
5. They have to swim constantly to avoid sinking as air bladders are absent.
6. Some of them possess electric organs like a torpedo and some may have poison stings like Trygon.

Bony fishes:

1. Their skeleton is composed of bone rather than cartilage.
2. These fishes belong to the class Osteichthyes.
3. These have 4 pair gills covered by operculum and skin is covered with ctenoid scales.
4. Their buoyancy is regulated by the presence of an air bladder, because of which they can avoid continuous swimming.
5. Pufferfish is also a bony fish that belongs to the family Tetraodontidae.