Net a Fish mutations increase fish earnings and sale value, with Starlit offering the highest obtainable multiplier in the Mini-Games Update.
This Roblox fishing game has seven named mutations: six regular fusion tiers and the separate Haunted Halloween variant. Catch mutated fish with your net when you want new species and variants. Fuse duplicate stacks when you already have a particular fish you want to improve.
Your pool needs a separate decision. A higher mutation tier does not guarantee that an individual fish earns more, so check its placement income before replacing a current occupant.
Net a Fish mutation multipliers
The normal mutation ladder runs from Shiny through Starlit. Haunted belongs to Halloween content and is not a fusion step after Starlit.
| Mutation | Fish earnings and sale-value multiplier | Place in progression |
|---|---|---|
| Shiny | 1.15x | First fusion tier |
| Gold | 1.25x | Second fusion tier |
| Crystal | 1.35x | Third fusion tier |
| Glitched | 1.5x | Fourth fusion tier |
| Rainbow | 2x | Fifth fusion tier |
| Starlit | 2.5x | Final regular fusion tier |
| Haunted | 3x | Separate Halloween variant |
Haunted has the largest listed multiplier, but it became unavailable when Halloween content was removed with the Mini-Games Update. Starlit is the strongest obtainable mutation in that version.
Mutation is separate from species and rarity. A Shiny Moonveil Jellyfish can still be Mythic, for example. Each fish supports one mutation, so these variants do not stack on a single catch.
Treat the table as a comparison between otherwise equivalent fish. Size and other boosts can change an individual's earnings, and displayed pool income can already include those effects. Do not apply a mutation multiplier to your entire pool total again.
How to catch more mutated fish
Mutated fish can appear in the water and enter your collection when caught with your net. Permanent upgrades, equipped bait, and active events improve your mutation-catching opportunities.
Buy permanent mutation bonuses
Start with Mutation Magnet under Upgrades → Fishing. Each level adds 0.5 percentage points of mutation luck across Levels 1–10, reaching +5% at Level 10.
The Fish Index and skill tree provide further progression-based bonuses:
| Bonus | Effect | Required action |
|---|---|---|
| Completed Fish Index page | Permanent +1% mutation chance per claimed page | Finish the page and claim its reward |
| Shimmer, Level 1 | +5% mutation luck | Learn Lucky Waters in the Luck branch, then spend one Skill Point on Shimmer |
| Shimmer, Level 2 | +10% mutation luck | Spend another Skill Point to upgrade Shimmer |
Choose Mutation Magnet when you want to put cash toward mutation fishing. Use completed Index pages for permanent rewards, and follow the Lucky Waters prerequisite if you are spending Skill Points on Shimmer.
Equip mutation bait before casting
Glitter Lure greatly increases mutation chance. It unlocks at Captain, Rebirth 6, and is bought through the Bait Shop. After purchasing it, select Use and confirm that its status reads IN USE.
Each cast consumes one bait. Buy enough for the session you plan to play, especially if you want to keep fishing throughout a mutation event.
Starlight Worm and Phoenix Feather also improve mutation-catching chances. Both require Rebirth progression to unlock, so choose from the mutation bait your current progression allows.
Watch mutation events
Shimmer Surge, Wave Rush, and Lucky Tide can help you catch mutated fish. Their bonuses differ, and Wave Rush requires you to check the current wave before planning around its strongest mutation effect.
| Event or wave | Mutation benefit | Condition |
|---|---|---|
| Shimmer Surge | 3x mutated fish | The event must be active |
| Wave Rush, Extreme wave | 10x mutations | Extreme wave 3/3 in the three-wave configuration |
| Lucky Tide | Increased mutation-catching chances | The event must be active |
The Wave Rush banner identifies the active phase and its bonuses. Its 10x mutation effect belongs to the Extreme wave described above, not every wave carrying the event's name.
Keep the different bonus labels separate. Mutation-luck percentages, game-pass multipliers, and event effects do not establish a final catch probability simply by being multiplied together.
How to fuse fish from Shiny to Starlit
Fusion upgrades matching duplicate stacks through the Fish Cooler. Pick a species you want to improve, then collect the required number of fish at its current mutation tier.
Fusion recipes and material requirements
Each recipe consumes fish from the tier immediately below its result. The final column shows how many Normal fish that result represents if you create every ingredient through fusion.
| Result | Required duplicate stack | Normal fish equivalent |
|---|---|---|
| Shiny | 10 Normal fish | 10 |
| Gold | 8 Shiny fish | 80 |
| Crystal | 6 Gold fish | 480 |
| Glitched | 4 Crystal fish | 1,920 |
| Rainbow | 3 Glitched fish | 5,760 |
| Starlit | 2 Rainbow fish | 11,520 |
The Normal fish equivalent is a planning calculation, not an extra charge. Catching a Gold fish directly already supplies one ingredient toward Crystal without requiring you to build that Gold from Normal fish.
Later recipes use fewer ingredients, but each ingredient represents more work from earlier tiers. Check your existing stacks before choosing a long-term target.
Prepare your next fusion
Use this sequence to avoid collecting duplicates without a clear destination:
- Choose the species you want to advance.
- Open the Fish Cooler and check its stacks by mutation tier.
- Find the next recipe in the table.
- Gather the missing matching duplicates, then use the cooler's fusion options.
A stack of seven Shiny fish, for example, needs one more matching Shiny to reach the Gold requirement. Other species do not contribute to that stack.
Should you buy Mutation Hunter or Auto Fuse?
Mutation Hunter improves mutation chance when catching fish. Auto Fuse handles eligible duplicate stacks in the cooler. Choose the pass that matches the task you want to change.
| Game pass | Price | Advertised effect | Choose it for |
|---|---|---|---|
| Mutation Hunter | 249 Robux | 2x mutation chance | More opportunities to catch mutated fish |
| Auto Fuse | 199 Robux | Automatically fuses eligible stacks | Less manual fusion management |
| 2x Luck | 349 Robux | 2x luck for rarer fish | Targeting fish rarity |
Mutation chance and rarity luck are separate bonuses. If your purchase is specifically for mutations, Mutation Hunter advertises that effect. The 2x Luck pass targets rarer fish instead.
Auto Fuse activates once a stack contains enough eligible fish and continues up the ladder when further stacks meet their requirements. It automates the process without removing the ingredient costs.
A doubled mutation chance is a relative bonus, not a guaranteed mutated catch. Check the in-game shop before buying, because pass prices can change.
Which mutated fish should you keep in your pool?
Use the placement income preview to compare candidates for a pool slot. A larger fish with a lower mutation tier can earn more than a smaller, higher-tier individual of the same species.
Compare both fish in the same interface. Catch-result income and placement income can include different boosts, so they are not interchangeable numbers for choosing a pool occupant.
Keep your decisions separate:
- Pool income: Choose the individual with the better placement preview.
- Fusion progress: Review spare matching stacks against the next recipe.
- New catches: Use mutation bonuses when you still need variants, species, or fusion ingredients.
Before replacing a displayed fish, compare the candidate's placement preview with the current occupant. Advance your chosen species through fusion, but let its displayed earnings decide whether the result belongs in your pool.
