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Hole is the best mutation by the multiplier values reported in third-party guides, at 20x, followed by Venom at 10x. Those figures are not an official developer specification, so check the fish’s live in-game mutation label after updates. To hunt them, watch for Poison weather for Venom and Black Hole weather for Hole; neither event guarantees a catch.
In +1 Drain Water Per Click, players gain Water by clicking, drain pools to find fish, and progress to larger pools and areas. Fish mutations are reported to improve both sale value and aquarium earning rate. The Roblox listing describes the game’s core loop and says it supports all devices: Roblox game listing.
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Which mutations are available, and which is best?
Third-party guides report four mutations. Hole ranks highest by their stated multiplier, while Gold and Diamond are described as more common natural spawns than Venom and Hole.
| Mutation | Reported multiplier | Reported natural availability | Matching weather reported |
|---|---|---|---|
| Gold | 2x | Higher chance | None reported |
| Diamond | 5x | Higher chance | None reported |
| Venom | 10x | Low chance | Poison |
| Hole | 20x | Low chance | Black Hole |
The multipliers and relative spawn descriptions are guide-reported rather than developer-confirmed; one guide calls its figures an August 20, 2026 snapshot. The available guides do not establish exact base odds or confirm whether odds differ by pool or area. Read the mutation text above a fish’s name rather than relying on color alone, which guides describe only as a visual hint.
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How do Poison and Black Hole weather affect mutations?
Guides associate Poison weather with Venom and Black Hole weather with Hole. They report that each matching event lasts about four minutes and raises the matching mutation’s spawn chance by about 10%. These are approximate third-party figures, not official values or a guarantee that a matching fish will appear.
No dependable event schedule or recurrence interval is established, so use the live event indicator rather than waiting for a predicted time.
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How to hunt for a mutated fish
- Watch the in-game event indicator for Poison or Black Hole weather.
- When a matching event is active, go to a pool and spend the short window draining it to produce new fish.
- Inspect new spawns for the mutation label above each fish’s name. The event improves reported odds; it does not guarantee a mutation.
- Pick up a desirable mutated fish promptly. Guides report that fish left on the floor can despawn.
Weather is reported to affect new spawns, not to transform an ordinary fish already in your backpack or aquarium.
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Should you sell a mutated fish or keep it in your aquarium?
Guides report that mutations increase both sale value and aquarium earning rate, so the better choice depends on whether you need cash now or want aquarium income. The available sources provide no universal sell-versus-display break-even calculation; weigh the fish against your current cash needs and aquarium plan.
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