The common name of the fish $Anguilla$ is:

Which of the following is a characteristic feature of $Osteichthyes$ (bony fishes)?

How important is the presence of air bladder in Pisces?

Cod liver oil is extracted from

Fishes having a swim bladder,which does not have direct communication with the exterior and where the resorbent and secretory parts are not sharply separated from one another,are called:

Which one of the following is an example of a lung-fish?