Angler Fish (Link's Awakening)

Angler Fish is the Nightmare of Angler's Tunnel, the fourth dungeon in The Legend of Zelda: Link's Awakening. As its name may suggest, it is an oversized Anglerfish.

Strategy
Nothing hard about this boss. After entering the Nightmare's room, enter the passageway in front of you. Just strike his weak point, the lure thing on top of its head like a madman. After it's defeated, head back up from the water and get the Surf Harp.