Black Fathom Ray

There is one tameable creature with this look.

Black Fathom Ray
Can Be Tamed
Coral Forest, Nazjatar
Retains its original name after taming.
Has been found in south-eastern and northern parts of the area. Found atop a tall coral formation and may require flying, a Gnomish Gravity Well, or something similar to reach.
Level scaling: Most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.

Matching Mounts