actual ways to fish in botw:

-shooting the fish with a bow and arrow (this is the only actual irl fishing method in the entire game)

-bombs

-creating pillars of ice beneath the fish and then picking them up as they flop around

-swimming really fast and grabbing them presumably with your bare hands and/or teeth

-swimming really fast and chasing them until they beach themselves and then picking them up

-electrocuting the water with magic weapons

-wearing rubber armour and metal equipment and sitting in the water and waiting for lightning

not actual ways to fish in botw:

-rod and line

-a net