Mutations raise the reported sale value and earning rate of newly discovered fish in +1 Drain Water Per Click. The reported set is Gold, Diamond, Venom, and Hole.
The names, multipliers, colors, weather boost, and duration below come from a single Pro Game Guides release-meta report dated August 20, 2026. No second exact-game source confirms the table, so treat these details as a dated snapshot and check the live fish label and weather UI after updates.
These are the four fish mutations and their multipliers
Use the name above the fish as your main check. Color helps too, although Roblox lighting sometimes gives every fish a suspicious purple makeover.
| Mutation | Reported multiplier | Reported look and label | Reported way to find it |
|---|---|---|---|
| Gold | 2x | Gold-like look with a Gold label | Higher reported natural chance |
| Diamond | 5x | Cyan look with a Diamond label | Higher reported natural chance |
| Venom | 10x | Neon-green look with a Venom label | Low reported natural chance; Poison weather helps new spawns |
| Hole | 20x | Dark look with a Hole label | Low reported natural chance; Black Hole weather helps new spawns |
These are reported release-meta values, not a permanent odds chart. Exact natural spawn percentages and area-by-area rates are not confirmed.
Pick up mutated fish before they despawn
Mutated fish can appear across the map. Use the normal Water and pool loop, then give every new fish a quick label check.
- Click for Water. Build up Water through the regular click loop.
- Drain a pool. Draining pools reveals fish and keeps the discovery loop moving.
- Check the label above each fish. Look for Gold, Diamond, Venom, or Hole before moving on.
- Pick up a mutation quickly. A mutated fish must be collected before it despawns.
- Scan each new area. Do not stop after checking one pool.
Weather does not reroll fish already in your aquarium or inventory. Its reported effect applies to the chance of new mutated-fish spawns, so watch new fish instead of waiting for an old catch to change clothes.
Use Poison and Black Hole weather for rare mutations
The reported pairing is Poison weather for Venom fish and Black Hole weather for Hole fish. The same release-meta report lists a +10% spawn-chance boost and a four-minute duration for both weather events.
These weather numbers are single-source release-meta details from August 20, 2026. They are not a confirmed permanent schedule, and no exact event timing should be assumed. When either event appears, focus on fish that spawn during the active window.
Gold and Diamond are reported as the more likely natural-spawn mutations, so you can find them without waiting for weather. Venom and Hole are reported to have low natural chances, which makes their matching weather windows the practical time to watch closely.
A fish can have only one mutation at a time according to the same report. Mutation rules from other Roblox games do not carry over: Build a Base and Steal Pet Mutations covers a separate pet system, while Greedy Growers mutations and multipliers covers a separate fruit-value system.
If the live game panel disagrees with any release-meta number here, follow the in-game label and event UI.
