Zulian Mudskunk

The Zulian Mudskunk is a fish found only in the waters of Zul'Gurub. These fish are a favorite of the water beast Gahz'ranka and can be used to pull him from his lair.

Source
These fish can be pulled from the waters in Zul'Gurub. The best place to find them are at Muddy Churning Waters spots. It requires a fishing skill of 350 to land the fish.