King of the Swamp
Era of the Hero of Time
Great Fairy Fish (Ocean Fishing Hole counterpart)
Little is known about him, other than the fact that he only appears when all other fish have been caught, but Link must then exit and reenter the fishing hole until he finds Lord Chapu-Chapu.
He appears to have an affinity for small fish, as it is the only thing that will lure him in to be able to be caught.