Question

What are the differences between the following:

Cartilaginous fishes and bony fishes.

Answer 1

1. Chondrichthyes/Cartilaginous fishes are a class of jawed fishes having a cartilaginous skeleton.
2. Osteichthyes/Bony fishes are a class of jawed fishes having a bony endoskeleton.

Differences:

S.no.	Cartilaginous fishes	Bony fishes
1	Cartilaginous fishes are a class of jawed fishes having a cartilaginous skeleton.	Bony fishes are a class of jawed fishes having a bony endoskeleton.
2	They have 5 gills that are overly exposed (no operculum).	They have an operculum on either side of their gills.
3	In them, fertilization is through internal mechanisms.	They fertilize their eggs externally.
4	Mouth is located ventrally.	Mouth is mostly terminal.
5	Chondrichthyes/Cartilaginous fishes do not have air bladders.	Bony fish/Osteichthyes have air bladders.
6	Examples- Trygon (sting ray),Scoliodon (Dog fish).	Example- Seahorse, Rohu.