The common name of $Wallago \ attu$ is:

Select the set of fishes which belong to the class Osteichthyes:

The fish famous for parental care is

The fish which shows parental care is

The presence or absence of which of the following is used to distinguish between bony fishes $(Osteichthyes)$ and cartilaginous fishes $(Chondrichthyes)$?

Which of the following animals is poikilothermic (cold-blooded)?