TheRadioactive Carpis a unique variant of the Mutant Carp, one ofStardew 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 outlinesthe quickest and simplest approach toobtaining Radioactive Carpand highlights its optimal uses. Here’s how to stock your inventory with a collection of these creepy carp.
Prerequisites of Radioactive Carp Fishing
The Radioactive Carp exclusively appears duringthe Extended Family Quest. To catch this Legendary creature, you need to attainFishing Level 10or have an active Fishing Buff. Unlike the Mutant Carp, the Radioactive variant can spawn year-round, irrespective of the weather conditions, and is catchable multiple times during the quest.
There is no limit on how many Carp you catch during the Quest. However, note that the challenge will remain active for 3 in-game days.

How to Get Radioactive Carp
To catch a Radioactive Carp,head to the Sewers. If you want to guarantee fishing one, use the Iridium Rod with a Lead Bobber. You can also go withthe Wild Baitto maximize your chances of luring this Legendary Fish.
Catching Radioactive Carp is the same as its Mutant version, except it doesn’t have to be raining for the fish to spawn. Once the Extended Family Quest is active, you may go down in the Sewers and start fishing in the contaminated waters.

Here’s a quick recap:
Mr. Qi’s special order board offers rotating missions. So, if the Extended Family Quest is unavailable, check back again or finish other missions until it shows up.
Best Uses of Radioactive Carps
Radioactive Carp can be utilized to craftSashimi, Maki Rolls, and Quality Fertilizer. Another option is using them in the dyeing process to achieve a green color. However, the most lucrative application for thisLegendary Fishis selling it to merchants. With a base price of 1,000g and the potential to catch multiple during the quest, maximizing your profit involves aiming to sell as many Radioactive Carps as possible.
When generously giving away special fish, note that Radioactive Carp isn’t universally appreciated. The best response you can expect is a neutral reaction. Among the characters, only Demetrius, Elliott, Leo, Linus, Pam, Sebastian, and Willy are tolerant of thisCarp as a gift.

