Question

Distinguish between cartilagenous fishes and bony fishes.

Answer 1

Cartilaginous Fishes	Bony Fishes
Classified under the class Chondrichthyes	Classified under the class Osteichthyes
The skeleton is made up of cartilage	The skeleton is made up of bones
They show marine habitat	They show both the marine and freshwater habitat
Gills are not covered with an operculum	Gills are covered with an operculum
RBCs are formed in spleen and thymus	RBCs are formed in the red bone marrow
The swim-bladder is absent, have to swim continuously to prevent sinking	The swim bladder is present that maintains the buoyancy
For examples, include Labeo, Rohu etc.	For example, include sharks, rays eyc.