Golden Carp

Golden Carp are a type of fish which are found extremely rarely by fishing in any biome in the Underground, Cavern and Underworld layers, with the exception of the Desert /  an Ice biome that is Corrupted, Crimsoned, or Hallowed. Unlike most other fish, Golden Carp are not used for crafting. Instead, they have an extraordinarily high sell value of.

Trivia

 * Despite being a golden fish, they are used in neither the nor any type of.