All Mutations and Multipliers in Net a Fish (November 2026) Ultimate Guide

Mutations are the fastest way to boost your income in Net a Fish on Roblox. As of the game’s Mini-Games Update (still current in November 2026), Net a Fish has seven mutations: Shiny (1.15x), Gold (1.25x), Crystal (1.35x), Glitched (1.5x), Rainbow (2x), Starlit (2.5x), and Haunted (3x, currently unobtainable). A mutated fish earns more Cash per second and sells for more than its normal version, and the rarer the mutation, the bigger the boost.

I’ve been grinding the river, testing every bait and event, and fusing hundreds of duplicates since UpdatesDev launched the game in October 2026. Below, I’ve listed every mutation with its exact multiplier, every way to get mutated fish — fusion recipes, luck upgrades, rerolls included — and the tiers actually worth your time.

Mutation	Multiplier	How to Get	Status
Shiny	1.15x	Catch it, or fuse 10 Normal Fish	Obtainable
Gold	1.25x	Catch it, or fuse 8 Shiny Fish	Obtainable
Crystal	1.35x	Catch it, or fuse 6 Gold Fish	Obtainable
Glitched	1.5x	Catch it, or fuse 4 Crystal Fish	Obtainable
Rainbow	2x	Catch it, or fuse 3 Glitched Fish	Obtainable
Starlit	2.5x	Fuse 2 Rainbow Fish	Best obtainable
Haunted	3x	Halloween event only	Unobtainable

Before you start, top up your wallet with the latest Net a Fish codes — free Cash and boosts make mutation hunting noticeably smoother.

What Mutations Do in Net a Fish?

A mutation is a random variant rolled the moment you catch a fish, raising both its earning rate and its sale value — a Starlit copy earns 2.5x what a normal copy of the same species earns. Three rules matter:

One mutation per fish. A fish can’t hold two mutations at once.
No late mutations. Fish already stored in your cooler or aquarium can never mutate after the catch.
Rarity stacks separately. Mutations don’t replace species or rarity — a Mythic fish can also be Shiny, which is why two copies of the same fish can differ wildly in value.

How to Get Mutated Fish in Net a Fish?

There are two core methods — catching mutated fish in the river and fusing duplicates — plus a stack of boosts that raise your odds on top.

1. Catch Mutated Fish in the River

Stand near any body of water and press C to cast your net. Every catch has a small chance to come out mutated, and you can push that chance up with the upgrades, events, and baits below. Cast constantly — volume matters as much as luck here.

2. Upgrade the Mutation Magnet

Open the Upgrades menu, select the Fishing tab, and scroll down to the Mutation Magnet. Each of its 10 levels adds +0.5% mutation luck, for a permanent +5% at Level 10. It’s the single best long-term investment for mutation hunters, so keep upgrading it whenever you can afford it.

3. Fish During Mutation Events

Limited-time events multiply how many mutated fish appear, so play intensely while they’re live:

Wave Rush — during its Extreme wave (wave 3 of 3), mutations hit 10x, alongside 10x rare fish and 3x fish quantity.
Lucky Tide — improves your odds of finding valuable and mutated fish.
Shimmer Surge — 3x mutated fish for the whole event.

One event window is worth more than hours of idle fishing outside it.

4. Use Special Baits

Three baits improve mutation odds: Glitter Lure (a strong mutation-chance boost, unlocked at Rebirth 6 / Captain rank), Starlight Worm, and Phoenix Feather. All three are bought from the Bait Shop once you’ve met their Rebirth requirements, so push your Rebirths and equip them every time you hunt rare variants.

5. Fuse Duplicate Fish in the Fish Cooler

The Fish Cooler menu lets you fuse duplicate fish up the mutation ladder:

10 Normal Fish → 1 Shiny
8 Shiny → 1 Gold
6 Gold → 1 Crystal
4 Crystal → 1 Glitched
3 Glitched → 1 Rainbow
2 Rainbow → 1 Starlit

Chained end to end, one Starlit costs roughly 11,520 normal fish, so feed the system constantly instead of selling duplicates. The Fisherman NPC on your dock auto-catches duplicates for you — upgrade him with Cash to keep the fusion pipeline full.

6. Stack Extra Mutation Luck

Three permanent boosts most players miss:

Mutation Hunter game pass — doubles your mutation chance (2x).
Index rewards — claim the reward on every completed Index page for a permanent +1% mutation chance each.
Shimmer skill — in the Luck branch of the Skill Tree (learn Lucky Waters first), it grants +5% mutation luck at Level 1 and +10% at Level 2, costing one Skill Point per level from your Rebirths.

7. Reroll and Lock Showcase Fish

Already showcasing a fish? The Mutation Reroll changes its mutation — it can upgrade, stay the same, or downgrade. Spend a Mutation Lock first to block a downgrade on the next reroll; the lock is consumed by that reroll. It’s a clean way to upgrade tank fish you never want to recatch.

All Net a Fish Mutations Explained

Shiny, Gold, and Crystal (1.15x–1.35x) are your early-game workhorses. The boosts look small, but across a full aquarium they compound into real income, and the fusion costs stay low enough to mass-produce all three tiers.

Glitched (1.5x) is the midpoint of the ladder. Its pixelated look makes it easy to spot in the river, and it’s the last tier where fusion still feels cheap before the requirements snowball.

Rainbow (2x) doubles a fish’s earnings — the first tier worth showcasing as a centerpiece. Rainbow fish can spawn in the river during boosted events, but fusing Glitched duplicates is the reliable route.

Starlit (2.5x) is the best obtainable mutation as of the Mini-Games Update. A full Starlit showcase is the realistic endgame for free players, since it lifts both income and sale value by 2.5x.

Haunted (3x) tops the list, but it was exclusive to the Halloween event — its Witching Hour window spawned 3x Haunted fish in three-minute bursts. With the event gone, existing Haunted fish keep their value and no one new can farm one.

Which Net a Fish Mutations Should You Aim For?

Prioritize by progression stage:

Early game: Shiny and Gold — cheap fusions that lift your whole tank.
Mid game: Crystal and Glitched — better returns while your Cash flow stabilizes.
Endgame: Rainbow and Starlit — the best obtainable multipliers and the only ones that meaningfully move a maxed aquarium’s income.

Two mistakes cost players the most: selling duplicates they’ll need for fusion later, and fishing outside event windows. Also check a fish’s placement preview income before swapping it into a showcase — size and setup can matter as much as the mutation itself. If you grind mutations in other fishing games too, my Deep Fishing mutations tier list ranks all nine of them.

Limited mutations do come back around — Fish It’s Halloween update added its own time-based mutation this 2026 — so when Haunted returns here, drop everything and farm it.

FAQs

What is the best mutation in Net a Fish?

Starlit (2.5x) is the best mutation you can actually obtain. Haunted (3x) is higher, but it’s tied to the Halloween event and currently unobtainable.

How do you get mutated fish in Net a Fish?

Catch them in the river with your net — boosted by the Mutation Magnet, baits, and events — or fuse duplicate fish in the Fish Cooler to climb the Shiny-to-Starlit ladder.

What does the Mutation Magnet do?

It adds +0.5% mutation luck per level across 10 levels, for a permanent +5% at max. Buy and upgrade it under Upgrades → Fishing.

Can a fish have two mutations in Net a Fish?

No. Fish hold one mutation at a time, and fish already in your cooler or aquarium can’t mutate later — the roll happens at the catch.

How do you get the Haunted mutation?

Only through the Halloween Witching Hour event, which spawned 3x Haunted fish in three-minute windows. It’s currently unobtainable — wait for its return.