Fishy
Source: Quest. Many believe (incorrectly) that goldfish have no memories. Trainers who have worked with them know this is clearly not the case and have the bruise... Aquatic type. Can be caged, which is not expected from a quest reward.
Fishy is a quest reward pet from the Mists of Pandaria expansion, obtained as a small fish housed inside a water globe.
Guide awaiting review
Summon Fishy
Type /use Fishy to summon him. He is not visible in the Pet Journal, so this command is required to bring him out.
Watch For Mob Aggro
Fishy will actively run toward and attack any nearby hostile mob on his own, which will result in him being defeated quickly. He does not aggro PvP-flagged players, only mobs.
Level Fishy To 20
Leveling Fishy to level 20 is reported to transform him into an enraged blue version of the 
Thundering Serpent Hatchling.
