Shark
From WoWWiki
A large aquatic fish-like beast. They are elite and patrol the coastlines of several zones.
These carnivorous fish are aggressive and liable to make unprovoked attacks against anything that approaches them. Smaller sharks are from 5 to 8 feet long and not usually dangerous to creatures other than their prey. Large sharks can reach around 15 feet in length and are a serious threat. Huge sharks are true monsters, like great whites, that can exceed 20 feet in length. Sharks circle and observe potential prey, then dart in and bite with their powerful jaws. A shark can locate creatures underwater within a thirty-foot radius. This ability works only when the shark is underwater. A shark can notice creatures by scent in a 180-foot radius and detect blood in the water at ranges of up to a mile.MGWS 18
Sharks, like all truly marine beasts, cannot be tamed by Hunters.
Wrath of the Lich King
A Wrath of the Lich King photo shows a picture of an Undead Shark, so it is likely that they are Scourge.
