Catfish

A Catfish is a character from The Legend of Zelda: A Link to the Past.

Biography
A gigantic Catfish, it lived inside the circular stones in the Lake of Ill Omen of the Dark World. It did not want visitors, and had a sign saying "KEEP OUT." Link managed to throw something into its home, and the Catfish attempted to bribe Link with the Quake Medallion if he would stop. Revisits will result in him hurling either a fireball or a bomb at Link.