The catch floated in purple, a bruise smearing across your inventory. I sold my first Noxious fish and watched the credits vanish. You need that mutation to gain access to the Plaguereaver Rod — a cost some players refuse to pay.
How to Obtain the Noxious Mutation in Fisch
Observation: In Toxic Grove, a single rod changes how every catch behaves—and that rod is the Toxinburst.
I’ll be blunt: Noxious is a loss-making mutation. It reduces sell value to 0.3x. That makes it a terrible money farm choice, but it’s the exact ticket you need to progress toward the Plaguereaver Rod. You’ll have to use the Toxinburst Rod in Fisch to produce Noxious fish — the rod paints catches purple and adds bubble particles to confirm the mutation.
How do you get Noxious Fish in Fisch?
Use the Toxinburst Rod. It has a 35% chance to apply the Noxious mutation on standard catches and a 15% chance to apply the beneficial Toxic mutation (6x sell value) instead. Its special Fungus ability spawns extra fish that carry Noxious at a guaranteed 100% rate.
How to Craft the Toxinburst Rod in Fisch
Observation: Olivia’s quest in Toxic Grove grants the raft you need to reach the fishing spots where the required materials spawn.
Start by finding Olivia in Toxic Grove and finishing her quest to earn the Toxic-Proof Raft. With the raft you can access the region and complete the follow-up quests to collect the Toxinburst parts.
| Quest or NPC | Objective | How to Complete | Rewards |
|---|---|---|---|
| Twisted Collection (Elijah) | Catch one Toxic Jellymass, one Mire Krakenling, and one Planterech | Equip the Toxic Spire Rod and fish in the waters inside Toxic Grove. | Toxinburst Handle |
| Plagued Reaper Stage 1 | Catch one Decayed-mutated Venom Maw | Wait for a Toxic Boil and use the Decayed Rod with Shark Head bait to catch the fish. | Toxinburst Line |
| Blight Specimen (Felix) | Catch one Giant Blight Pufferfish | Use Reinforced Crab Cages in Toxic Grove. Keep appraising the fish to get the Giant variant. | Toxinburst Shaft |
Place several Reinforced Crab Cages in Toxic Grove waters to farm the final material, Toxic Jellymass. After you collect all four parts, craft the rod at the Ancient Archives for 185,000 C$ (~€118,400).
Fisch Toxinburst Rod Stats and Ability
Observation: The rod sacrifices raw sell value for control over mutation output and propagation mechanics.
The Toxinburst’s Fungus generates fungi that can explode and yield extra fish carrying the Noxious mutation. It applies Noxious on standard catches 35% of the time and applies Toxic 15% of the time. Every 1–2 seconds the rod emits a poisonous burst that increases progress by 4% and it spawns one fungus every 20–40 seconds. Each fungus lasts 3 seconds and has a 20% chance to explode, granting 2–3 Noxious fish before disappearing.
Propagation mechanics stack: catching fish activates a propagation buff for 1 minute. Each subsequent catch adds 20 seconds and raises the propagation tier by +1, up to Propagation 50. Each tier boosts fungus spawn rate by 25% and poisonous burst rate by 2.5%. At max tier these bonuses can reach +1,250% and +125% respectively. Fungus bursts behave like tiny landmines of extra loot.
| Stats | Value |
|---|---|
| Lure Speed | 83% |
| Luck | 85% |
| Control | -0.02 |
| Resilience | 30% |
| Max Kg | 125,000 kg |
| Durability | 150 |
| Line Distance | 30 m |
| Price | 185,000 C$ (~€118,400) |
| Level Requirement | 325 |
| Stage | Stage 6 |
What is the sell multiplier for the Noxious Mutation in Fisch?
Noxious reduces sell value to 0.3x. That’s the single stat you must weigh against the rod’s mutation output when deciding whether to use Toxinburst for progression.
I confirmed these mechanics across community guides on Steam, Reddit posts, and several YouTube clips; the numbers line up. You can now catch a Rotbloom with the Noxious mutation and move toward the Plaguereaver Rod — but will you trade profit for that power?