Reekfish
The reekfish is a red fish found only in Zora's Domain in Twilight Princess, and are a favorite food of the Yeti race. The fish has a strong smell which helps Link, while in wolf form, locate the source of all the monster sightings in Zora's Domain. Strangly, when you first meet Yeto he is holding a Reekfish as big as Link.
The Reekfish can only be caught with a special Coral lure.
It apparently has a horrid stench, according to it's description, "It...reeks."