How to Get More Mutations in Net a Fish

In Net a Fish, a mutation is an extra tag that rolls on top of a fish’s normal rarity. It multiplies that fish’s earnings per second when you place it on a showcase, and it counts toward mutation sets in your Index. Two mutations are confirmed in the game right now. A Gold fish earns x1.25 its base income, and a Shiny fish earns x1.15. You can’t choose to get a mutation, but you can make one much more likely.

Quick answer: Buy Mutation Luck potions at the Hub’s Potion Shop, keep your net upgraded, then throw it during a Wave Rush. When the catch screen shows “x1.25 Gold” or “x1.15 Shiny”, you have a mutation.

Net a Fish mutation multipliers

A mutation doesn’t replace a fish’s rarity. A Historic fish stays Historic, and the mutation stacks on top of it. The multiplier applies to the fish’s base earnings per second, so the same mutation is worth far more on a 1-in-10-million catch than on a common one.

Mutation	Income multiplier	Example catch	Shown income
Gold	x1.25	Gold Galleon Gulper (Historic)	$80.27M/s
Shiny	x1.15	Shiny Mosasaurus Rex (Historic, 1 in 10M)	$53.04M/s

The Gold Galleon Gulper appears with a “Pirate Weeks – limited time!” banner, which ties that specific fish to a timed event. The Gold mutation itself is not limited to that fish.

What raises your mutation odds

Mutation chance is random on every catch, but four things in the game tilt the odds or raise the payoff. Use them together for the best results.

Mutation Luck potions from the Potion Shop in the Hub
Wave Rush events, which raise mutation chances in the river
A higher-tier net, which unlocks rarer fish and has more space for more catches per throw
Bait such as Abyss Shrimp, which adds net capacity and size

Mutation Luck potions and prices

The Potion Shop sells timed boosts for cash. Two of them target mutations directly. The others boost things that pair well with a mutation hunt, such as how many fish you catch or how big they are.

Potion	Effect	Price
Mutation Luck Tier IV	+20% mutation luck	$80,000
Mutation Luck Tier V	+25% mutation luck	$350,000
Fish Caught Tier III	+15% fish caught	$20,000
Size Luck Tier VII	+35% size luck	$6M
Cash Boost Tier VII	+35% cash	$6M

Mutation Luck Tier V is the stronger of the two mutation potions and still costs less than the high-tier Size Luck and Cash Boost options. Once your showcases earn millions per second, buying both Mutation Luck potions before a long fishing stretch costs very little.

Net tiers and the rarity cap

Your net decides which fish can be caught at all, and a mutation can only appear on a fish you’re able to catch. Each net upgrade adds space and width. Some also raise the maximum rarity your net can hold. You buy nets in the Upgrades menu.

Net	Tier	Price	Effect
Ancient Net	17	$6B	Space 200→225, Area +1.5%, +Historic
Primordial Net	18	$15B	Space 225→250, Area +1.5%
Eternal Net	19	$600B	Next tier up

The Ancient Net unlocks Historic catches, which is the tier where both confirmed mutation examples sit. More space means more fish per throw, and every fish is another chance at a Gold or Shiny roll.

Player on the dock beside the boat with the THROW NET button ready to cast — A fresh net ready to throw from the dock, next to the boat.

Some fish need a specific net to be caught at all. Without that net, the catch escapes and the game tells you which one you need.

Fishing screen warning that an escaped Monarch fish requires a Solstice Net — A Monarch fish escapes because the equipped net isn’t a Solstice Net.

Abyss Shrimp bait

The Bait Shop on your dock sells Abyss Shrimp in packs of 10 for $1690T. Each bait gives +60% net capacity and +15% size. Golden Grub is also on the shelf. When you run out of bait, you can keep throwing the net, but you lose the capacity bonus until you restock.

How to fish for mutated catches

The order matters here. Buy your potions before you start throwing so they’re running during your best catches, especially if a Wave Rush starts. If you don’t have the game yet, Net a Fish is free on Roblox.

Press the Hub button at the top center of the screen to travel to the Hub market. Your dock and everything on it stays as it is while you shop.

Arrow pointing at the Hub button at the top center of the screen — The Hub button at the top center of the screen takes you to the market area.

Walk to the Potion Shop and buy Mutation Luck Tier IV and Mutation Luck Tier V. Add Fish Caught Tier III if you want more fish per throw. Potions are timed, so buy them right before you plan to fish, not before a long break.

Hub area with the blue THROW NET button showing on screen — The Hub market, where the Potion Shop and other vendors are found.

While you’re at the Hub, check the Quest Board and claim any finished contracts. Contracts pay cash and pearls. Pearls are spent at the Pearl Shop on net skins and lures, such as the limited Moonpearl Net skin for 5,000 pearls.

Player walking up to the Pearl Shop with the E interaction prompt shown — Walking up to the Pearl Shop, which opens with the E prompt.

Go back to your dock and equip Abyss Shrimp if you have any. If you’re out, buy more at the Bait Shop first. The extra 60% capacity lets each throw hold far more fish before the net fills.

Back at the dock net station, ready to throw with bait equipped.

Press THROW NET to cast into the river. A white target circle marks where the net will land, and a net wireframe spreads across the water. Aim it into the thickest group of fish you can see.

Dock view with the THROW NET button pressed and an E Boat Open prompt nearby — Throwing the net from the dock, with the Boat prompt showing nearby.

Let the net fill while the Fishing panel tracks your catch. The counter shows how much space is used, such as 29/392 early in a throw, along with the name of the fish being pulled in.

Fishing panel showing a Nebula Koi and 29/392 net space with Reel In available — A Nebula Koi early in a throw, with the net at 29/392 space.

Fishing screen with an Azure Discus catch timer counting down — A Nebula Koi early in a throw, with the net at 29/392 space.

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Press REEL IN to bring the catch home. You can reel in at any point, but a fuller net means more fish rolled for mutations. When the meter reaches its limit, such as 435/435, the net is full.

Reeling In meter full at 435/435 next to the Reel In button — The Reeling In meter maxed out at 435/435.

Full net on the fishing screen as REEL IN collects the catch — The Reeling In meter maxed out at 435/435.

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Read the catch popup. A mutated fish shows its mutation in the name, such as Shiny Mosasaurus Rex, plus a tag like “x1.15 Shiny” next to its income. A fish with no tag and no prefix rolled without a mutation.

Boat Dock fishing panel reeling in a Stormshell Archelon with the REEL IN button — Reeling in a Stormshell Archelon, a Demigod catch.

Wave Rush: When mutation chances spike

A Wave Rush starts with a “TSUNAMI WARNING” alert, followed by “WAVE RUSH! 3 waves of rare fish incoming!” During the three waves, more rare fish spawn in the river and mutation chances go up. This is the best time to have Mutation Luck potions running, because both boosts apply at once.

Keep throwing and reeling for as long as the waves last. Each wave refills the river, so you get more chances than in normal fishing. Don’t stop to shop between waves. Throw the net again as soon as you reel in.

Dock fishing screen with FISHING active and REEL IN available — Fishing from the dock as the Wave Rush begins.

Fishing screen during Wave Rush with the REEL IN button ready — Fishing from the dock as the Wave Rush begins.

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Rare catches worth a mutation roll

Because a mutation multiplies base income, the fish it lands on matters as much as the mutation itself. These high-tier catches all come with their odds and income shown on the catch screen.

Fish	Rarity	Odds	Shown income
Great White Shark	Apex	1 in 120,000	$45,238/s
Basilosaurus	Demigod	1 in 1M	$924,956/s
Titan Filterfin	Demigod	1 in 5M	$1.51M/s
Shiny Mosasaurus Rex	Historic	1 in 10M	$53.04M/s
Worldreef Crab	Historic	1 in 20M	$113.23M/s

Historic fish earn far more than Demigod or Apex catches. That’s why the Ancient Net’s Historic unlock matters so much when you’re hunting mutations. A Gold roll on a Worldreef Crab is worth much more than the same roll on a Great White Shark.

Fishing screen at 424/435 capacity while a Great White Shark is pulled in — A Great White Shark, an Apex catch, coming in at 424/435.

Fishing panel reeling in a Titan Filterfin from the dock — A Great White Shark, an Apex catch, coming in at 424/435.

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Putting mutated fish on your showcases

A mutated fish only earns money when it sits on a showcase pad on your dock. The quickest way to make sure your new Gold or Shiny catch is being used is the Fish Cooler. Open it with E and press Equip Best. The game fills your showcases with the fish that earn the most per second, mutation multipliers included.

Player standing at the Fish Cooler with the E prompt to open it — The Fish Cooler on the dock, where Equip Best sorts your showcases.

Run Equip Best after every good haul, not just once. Showcases don’t swap fish on their own, so a fresh mutation can sit unused in the cooler. To collect what the showcases have earned, walk over the pads. A green ring means cash is ready, and a white ring means the pad is empty.

Dock Fishing panel active while a catch is reeled in — Reeling in another haul at the dock before sorting the cooler again.

Claiming mutation set rewards in the Index

Each mutation you catch also counts toward the Index, which tracks mutation sets as well as species. When you complete a set, open the Index and claim it. Each completed set gives +0.1% money & fish caught. That’s small on its own, but it’s permanent and adds up across many sets.

You’ll know the claim worked when the reward button for that set clears and the bonus is added. Rewards don’t claim themselves, so check the Index after any session that brought in new Gold or Shiny fish.

Traits are not mutations

Traits share names with fish rarities, which makes them easy to mix up with mutations. They’re a separate system. You spin for a trait using Trait Rolls, and Day 6 of Daily Rewards gives five of them. A trait adds a global multiplier to all money and fish caught. It doesn’t change any single fish.

Trait	Money & fish caught	Odds
Common	x1.05	1 in 8
Rare	x1.15	1 in 9
Apex	x1.5	1 in 11
Demigod	x1.65	1 in 15
Historic	x1.8	1 in 19
Monarch	x2	—

Rolling a trait you already own shows “You already have this trait.” Even though traits don’t touch mutation chance, a stronger trait boosts the income of every mutated fish on your showcases.