Air bladder occurs in

Assertion $(A)$: Fish live in water.
Reason $(R)$: Fish are adapted to aquatic environments.
Which option is correct for Assertion $(A)$ and Reason $(R)$?

Match the following columns regarding bony fishes (Osteichthyes):

Column-$I$ (Habitat/Type)	Column-$II$ (Examples)
$P$. Marine	$I$. Flying fish,Seahorse
$Q$. Freshwater	$II$. Rohu,Catla,Mrigal
$R$. Aquarium	$III$. Fighting fish,Angel fish

The fish famous for parental care is

Catadromous fish migrates from

How do fish suddenly change their direction?