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. Strangely, when you first meet Yeto he is holding a Reekfish as big as Link, which is several times bigger then any seen in Zora's Domain.

The Reekfish can only be caught with a special Coral lure.

It apparently has a horrid stench, according to it's description.

Trivia
Apparently if Yeto had not had the large Reekfish when he meets Wolf Link, he would of taken Link for dinner instead.