DC Animated Universe
The first catch of Joker Fish

The Joker Fishes

Joker Fish were fish with the Joker's features.

They were once regular fish, but were infected with Joker Venom, causing their mouths to be stretched into a smile and their skin turned white, a crew of fishermen were catching fish when they came across the Joker Fish and were disgusted at what they were seeing, Joker then tried to copyright them but was unsuccessful as the man at the desk told him that fish were a natural resource and nobody could copyright natural resources.

The Joker also made a commercial for them on TV, along with Harley Quinn and his henchmen.

As it was never brought up at the end of the episode, it's unknown if a cure for the fish was ever found or if they were permanently altered by the Joker Venom.


Batman: The Animated Series