Underlight Shorestalker

Coming in Patch 10.2.7.

Aid your deep sea charger in its hunt for prey along the ocean floors.

Riding Requirements:

Level 10
Apprentice Riding (ground)
Expert Riding (flying)

Source:

Tawny Seabraid in Stormwind City.
Wilder Seabraid in Stormwind City.
Shiri in Valley of Strength, Orgrimmar.
Zen'kala in Valley of Strength, Orgrimmar.
Cost: 800

Notes:

This eerie teal fish will be obtainable from the Trading Post in an upcoming month. Unfortunately, we can't say when exactly, as Blizzard don't announce Trading Post offerings ahead of time.

Travel Mode:

Ground (+60% or +100% speed)
Flying (+150%, +280% or +310% speed)

Speed depends on your riding skill.

Other Mounts Using the Same Model:

Kah, Legend of the Deep

Underlight Corrupted Behemoth

Indigo Underlight Fish

More info on Wowhead:

Underlight Shorestalker taught by Underlight Shorestalker