The branch of biology that deals with the study of fishes is known as:

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 of the following belong to class $Osteichthyes$?
$a$. Sea urchin
$b$. Seahorse
$c$. Flying fish
$d$. Sawfish
$e$. Dogfish

Sea horse is

How important is the presence of air bladder in Pisces?

The $Hippocampus$ is commonly known as a "sea horse" because: