Gyorg

A Gyorg is a recurring, shark-like enemy in The Legend of Zelda series, first introduced in The Wind Waker.

The Wind Waker
The Gyorgs in The Wind Waker are fierce-looking, shark-like enemies that inhabit certain parts of The Great Sea. If Link encounters a Gyorg while sailing, it will attempt to knock Link out of his boat, the King of Red Lions, by ramming it head-on. It can also attack Link by biting him should he encounter one in the water. Gyorgs usually attack in groups of two to five; they are also known to attack on their own. If Link encounters a group of Gyorgs while he is immobile, either in or out of the boat, they will circle him. Soon after, one of them venture in to ram the boat or bite Link. They can be defeated with two hits of the Boomerang or Arrows, or with a single blast of the Cannon.

According to the description of the Gyorg figurine in the Nintendo Gallery, Gyorgs are commonly known as "Ocean Killing Machines."

Phantom Hourglass
Gyorgs in Phantom Hourglass appear almost the same as they do in The Wind Waker, only bigger. Much like in The Wind Waker, they will swim alongside the S. S. Linebeck and attack it by ramming into it. If the S. S. Linebeck is immobile, the Gyorg will proceed to partially submerge where only its fin is visible, and then swim back and forth some distance ahead of Link until he begins sailing again. Since Gyorgs are only encountered out in the Ocean, the Cannon is the only weapon capable of defeating one. They can only be defeated if they are hit when they leap out of the water. If Link hits them with his Cannon when they are in the water, they will simply submerge and reemerge somewhere else.

Spirit Tracks
A different form of Gyorg appears in Spirit Tracks under the name of Malgyorg, and they reside in the sands of the arid Sand Realm rather than in the Ocean. It acts and looks the exact same as Gyorgs from The Wind Waker. However, they are yellow in color rather than the original purple. They are much larger than their oceanic cousins. They usually travel in groups that range from two to four. Since they only appear while Link is roaming the overworld on the Spirit Tracks, the Cannon is the only weapon capable of defeating them.

Trivia

 * In The Wind Waker, if Link uses a Tingle Bomb on a Gyorg, it will not simply explode. Instead, it will sink into the water, then, shortly after, the carcass will resurface and float on the water for a short period of time.
 * Gyorg's name may come from the Japanese word Gyo, meaning fish.