How important is the presence of air bladder in Pisces?

How Important is the presence of an Air bladder in Pisces?

Due to the absence of air bladder, fishes belonging to the class Chondrichthyes have to swim constantly. How important is the presence of air bladder in these fishes?

How. important is the presence of air bladder in bony fishes?

Air bladder is

Air bladder is

Air bladder is

Air bladder is

Air bladder is

What is the importance of air bladder in fishes ?