The Radioactive Carp is a unique variant of the Mutant Carp, one of Stardew Valley’s five Legendary Fish. To capture it, you must initiate a distinctive quest and venture into the town’s most toxic area—the Sewers. This guide outlines the quickest and simplest approach to obtaining Radioactive Carp and highlights its optimal uses. Here’s how to stock your inventory with a collection of these creepy carp.