The best mutation to chase is Hole for its huge 20x boost, followed by Venom at 10x, while Diamond and Gold are still worth grabbing whenever they spawn naturally.
Mutated fish are the quickest way to grow your income in +1 Drain Water Per Click, because each one is worth far more than the plain fish you drain up. There are four mutations to hunt right now — Gold, Diamond, Venom, and Hole — and the two rarest ones spike in number during special weather events. Here is how every mutation ranks, what each looks like, and how to farm them without wasting the short weather windows.
- Every fish mutation ranked by payout
- What mutations do for your aquarium income
- Gold fish and where they spawn
- Diamond fish for steady early income
- Venom fish and Poison Weather
- Hole fish and Black Hole Weather
- Farming mutations around weather events
- Mistakes that cost you mutated fish
- Frequently Asked Questions
Every fish mutation ranked by payout
| Mutation | How to get |
|---|---|
| Hole (20x) | Rare natural spawns; hunt during Black Hole Weather |
| Venom (10x) | Low natural spawn; hunt during Poison Weather |
| Diamond (5x) | Spawns naturally across all map areas |
| Gold (2x) | Spawns naturally across all map areas |
Key Priority runs top to bottom: Hole is the strongest multiplier, Venom is the easiest of the two rare ones to target, and Gold and Diamond are your steady background income. These multipliers come from what players have measured in the live game rather than an official stat sheet, so treat them as strong guidance rather than locked-in rules.
What mutations do for your aquarium income
A mutation raises both the sale value of a fish and its earning rate, so a single mutated catch pulls in far more Cash over time than a shelf of normal fish. That extra income is what pays for the things that actually speed you up.
Every bit of Cash a mutated fish generates goes straight back into water pumps, upgrades, pets, and rebirth progress, so building a collection of mutated fish early quietly accelerates everything else you are working toward.
Gold fish and where they spawn
Gold is the easiest mutation to run into and gives a modest 2x lift. You can spot one instantly by its golden color and the Gold nameplate floating above the fish. It spawns naturally across all areas of the map, with no weather event required, so grab every Gold fish you pass while you are draining and exploring.
Diamond fish for steady early income
Diamond is the next step up at a 5x multiplier. These fish have a bright cyan look and show a Diamond nameplate, and like Gold they can appear anywhere on the map without any event. Diamond catches are the workhorse of early and mid-game aquarium income — common enough to find regularly, valuable enough to matter.
Venom fish and Poison Weather
Venom jumps to a 10x multiplier and stands out with a bright neon green appearance. Its natural spawn chance is low, so the moment to hunt it is during Poison Weather, which adds roughly a 10% chance for Venom mutations for about 4 minutes. When the event fires, move around the map and check as many areas as possible, and scoop up any Venom fish the instant you see it.
Hole fish and Black Hole Weather
Hole is the strongest mutation in the game at a massive 20x, marked by a dark appearance. Natural spawns are rare, but Black Hole Weather raises the mutation chance by about 10% for around 4 minutes. That short window is your best shot at Hole fish, so do not waste it standing in one small zone — keep moving, check different areas, and pick up any Hole fish before it despawns.
Farming mutations around weather events
Keep moving between zones
During Poison or Black Hole Weather, run through as many areas and pools as you can instead of camping one spot.
Grab mutated fish on sight
Pick up any Gold, Diamond, Venom, or Hole fish the moment you spot it, since mutated fish despawn if you leave them.
Prioritize Venom in Poison Weather
When Poison Weather is live, focus on the neon green Venom fish to bank that 10x boost.
Go hard for Hole in Black Hole Weather
When Black Hole Weather appears, chase the dark Hole fish for the biggest 20x payout.
Collect Gold and Diamond between events
Outside the weather windows, keep scooping up the naturally spawning Gold and Diamond fish to build value steadily.
When Black Hole Weather appears, keep moving between zones and grab every Hole fish you can before the roughly 4-minute window closes — that 20x is the single biggest income jump available.
Mistakes that cost you mutated fish
The most common way to waste a weather event is to stand in one area and wait. Mutated fish can appear anywhere, and each window only lasts about four minutes, so parking in a single pool means you simply see fewer chances. Pair that with ignoring despawns — leave a mutated fish sitting and it will vanish — and a good event can end with nothing to show for it.
The other trap is treating the timing as a fixed schedule. The rough 4-minute duration and 10% boost are what players see in the current build, and any claim about exactly how often an event fires is not something you should plan around as guaranteed. Hunt hard when the weather is actually on screen rather than counting down to when you think the next one is due.
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Frequently Asked Questions
Can weather mutate fish already in your aquarium?
No. Poison and Black Hole Weather only raise the mutation chance on newly spawning fish. A fish already sitting in your aquarium or inventory will not change color or gain a multiplier when an event rolls in, so there is nothing to wait on with your existing collection — the value is entirely in what you catch fresh during the window.
Should you sell normal fish or keep only mutated fish?
Sell your plain, unmutated fish for Cash — that money is what funds water pumps, upgrades, pets, and rebirths, and normal fish are common enough that hoarding them does little. Hold onto the mutated ones instead, since their higher value and earning rate make them the backbone of your aquarium income rather than a quick one-time sale.
Are pets or mutations more important for progression?
They pull in different directions, and you want both. Pets give a passive multiplier to the water you collect per click, which speeds up the drain-and-earn loop itself, while mutated fish multiply the Cash your aquarium pays out. Lean on pets to drain faster and mutations to earn more, and stacking the two together is what pushes your rebirth progress the quickest.
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