Fisch: How to Get the Petrified Mutation in Roblox

Petrified is one of the higher-value mutations in Fisch, multiplying a fish’s sell price by 8x. It arrived in Version 2.0, and unlike event-locked mutations, it’s permanently available — you just need the right rod, the right water, or enough money to keep rerolling.

Quick answer: Fish at Skycrest with the Ancient Idol Rod, or pay 45 C$ per reroll at the Drowned Appraiser in Tidefall until a caught fish rolls Petrified. Without the rod, Skycrest still gives a 0.065% natural chance per catch.

What the Petrified mutation does to a fish

Petrified applies a flat 8x multiplier to the fish’s sell value and changes its appearance to a stony gray. It’s appraisable, which is what makes the reroll route viable at all, and its base chance through appraisal sits at roughly 0.065%.

The rule that matters most while grinding: a fish can only carry one mutation at a time. Attributes are separate and do stack, so a Big Sparkling Petrified catch is possible and sells for considerably more than the mutation alone. Size attributes like Big and Giant can be stripped away during appraisal if the fish loses enough weight, so a heavy fish you’re happy with is a risky reroll candidate.

Property	Value
Sell multiplier	8x
Appraisable	Yes (~0.065% base chance)
Natural catch rate	0.065% at Skycrest
Rod source	Ancient Idol Rod
Added in	Version 2.0

Unlock the Ancient Idol Rod from Forgemaster Torin

The Ancient Idol Rod is the dedicated tool for this mutation, and it isn’t sold outright. Forgemaster Torin hands it over only after two conditions are met, and both are tied to Skycrest.

Catch five fish with the Giant attribute at Skycrest. Giant means the fish weighs more than roughly twice its base weight, so bring a rod or enchantment that boosts weight — Sea King, Sea Overlord, the Poseidon Rod, and the Kings Rod all push catches toward the Big and Giant thresholds.

Unlock all seven Ancient Idol Charms. This is the longer half of the requirement, and it gates the rod completely — five Giants with six charms won’t do it.

Return to Forgemaster Torin and claim the rod. Once it’s in your inventory, open the Fishing Rods menu to equip it and confirm its stats and requirements are listed there before you head back out.

Fish for Petrified at Skycrest

Skycrest is the only place Petrified appears naturally, and the rate there is 0.065% per catch without any rod bonus. The Ancient Idol Rod raises that chance while you fish, so the two work together rather than as alternatives.

Equip the Ancient Idol Rod and travel to Skycrest. Cast into open water there rather than at any other location — moving to a different area removes the natural Petrified roll entirely.

Fisch gameplay with a glowing rod equipped and the Click & Hold Anywhere casting prompt on screen — Casting at Skycrest with the rod equipped, with the Click & Hold Anywhere prompt ready.

Work the reeling bar as normal. Hold anywhere on screen and steer left or right to keep the marker on the fish until the catch completes — mutations are rolled on the catch, so a failed reel is a wasted roll.

The reeling control bar in Fisch showing left and right arrows during a catch — The reeling controls: hold and steer with the left and right arrows to land the fish.

Keep casting. At these odds you are looking at a long session, so sell or store the junk catches as you go and watch the catch banner for the Petrified prefix.

Tip: Don’t grind this with a rod that forces a different mutation at a high or guaranteed rate. Since a fish can hold only one mutation, a 100% rod effect leaves no room for Petrified to land.

Reroll a fish at the Drowned Appraiser in Tidefall

If you already have a fish worth keeping, the second route skips the rod grind entirely. The Drowned Appraiser in Tidefall rerolls a fish’s mutation at double the mutation chance of the standard Appraiser, and each attempt costs 45 C$ — a fraction of the 450 C$ the Moosewood Appraiser charges.

Travel to Tidefall with the fish you want to reroll in your inventory. Gliding is the quickest way across, and the prompt to deploy one only works once you’re already airborne.

Fisch character mid-air with the warning Must be in the air to deploy a glider — The glider only deploys once you’re off the ground, as the on-screen warning explains.

Interact with the Drowned Appraiser and select the fish. Pick a catch you’re willing to lose value on, because appraisal shifts weight in both directions and can strip a Big or Giant attribute if the fish gets lighter.

Pay 45 C$ and repeat. Each attempt is an independent roll against a small chance, so budget for a long run of failures rather than expecting a hit inside a handful of tries.

Which route to pick

Route	Requirement	Cost per attempt
Ancient Idol Rod at Skycrest	5 Giant fish at Skycrest, 7 Ancient Idol Charms	Free (time only)
Natural catch at Skycrest	Any rod, fish at Skycrest	Free (0.065% per catch)
Drowned Appraiser, Tidefall	A fish already in your inventory	45 C$
Appraiser, Moosewood	A fish already in your inventory	450 C$

The rod route is the better long-term investment if you plan to farm Petrified repeatedly, since it costs nothing per cast once unlocked. The Tidefall route is faster to start and the sensible choice if you’re short on charms but flush with cash.

How to confirm the mutation applied

The mutation name is added directly to the fish’s label, so a rock becomes a Petrified Rock and shows the same prefix in your inventory and at the sell menu. The fish also takes on the mutation’s gray stone coloring, and its listed sell price jumps to eight times the base value.

If it isn’t landing, the cause is almost always one of three things. You’re fishing somewhere other than Skycrest, your rod is applying a competing mutation that occupies the single mutation slot, or you simply haven’t hit the odds yet — at 0.065% per catch, hundreds of casts without a Petrified is normal, not a sign something is broken.