Fishing Brainrot Traits Mutations Guide

This guide explains the traits and mutations system in the popular Roblox game Fishing (often called Fishing by the developer). You’ll learn what each trait and mutation does, how they affect your catches, and how to use them to your advantage. The guide covers all known traits and mutations, their effects, and how to get them.

Formula

The calculator estimates how many mutated fish you can expect after catching a certain number of fish, given a mutation chance. The expected number is simply the number of catches multiplied by the mutation chance (as a decimal). The probability of getting at least one mutation is calculated as: 1 - (1 - m/100)^t, where t is the number of catches and m is the mutation chance in percent.

Variables:

• t – number of fish caught (integer)
• m – mutation chance in percent (e.g., 1% = 1)

Worked Example

Using the default values: you catch 100 fish, and each has a 1% chance to be mutated. Expected mutations = 100 × 0.01 = 1.0. The probability of at least one mutation = 1 – (0.99)^100 ≈ 1 – 0.366 = 0.634, or 63.4%.

What Are Traits and Mutations?

In Fishing, every fish you catch has a chance to carry a trait (a passive effect) or a mutation (a visual or gameplay alteration). Traits are like buffs that affect how the fish behaves or what it gives you. Mutations are rarer and often change the fish’s appearance, sometimes adding special effects.

You can see a fish’s trait and mutation on its info card when you catch it or view it in your inventory. Traits and mutations are separate – a fish can have both, neither, or just one.

All Traits and Their Effects

Traits are relatively common. Each fish can have up to one trait. Here are the known traits:

• Lucky – Increases the chance of catching a rare fish by a small amount.
• Swift – The fish is faster when hooked, making it harder to reel in.
• Lazy – The fish is slower when hooked, making it easier to catch.
• Greedy – The fish gives more coins when sold.
• Mystic – The fish has a higher chance of being a mutation.
• Ferocious – The fish is more aggressive, reducing the catch bar faster.
• Calm – The fish is less aggressive, making the catch bar slower.

These are the traits that have been observed in the game. The exact percentages are not officially published, but players have estimated them through testing.

All Mutations and What They Do

Mutations are much rarer than traits. They are cosmetic but can also have gameplay effects. Here are the known mutations:

• Albino – The fish is completely white. No gameplay effect.
• Melanistic – The fish is completely black. No gameplay effect.
• Golden – The fish is gold and sells for 2× the base price.
• Diamond – The fish is covered in diamonds and sells for 5× the base price.
• Shiny – The fish has a sparkly effect. No gameplay effect.
• Electrified – The fish has an electric aura. No gameplay effect.
• Frozen – The fish is covered in ice. No gameplay effect.

Mutations are purely cosmetic except for Golden and Diamond, which increase the sell price. They do not affect the catch difficulty.

How to Get Traits and Mutations

Traits and mutations are random. Every fish you catch has a small chance to have a trait (roughly 5-10% per fish) and a much smaller chance to have a mutation (roughly 1% or less). You cannot directly increase these chances, but you can:

• Use bait that increases rarity (if it exists in the current version).
• Fish in areas with higher rarity fish.
• Use the Mystic trait on a fish to increase mutation chance for that specific fish.

Some players believe that catching fish with a higher rarity (like legendary) have a higher chance of being mutated, but this is not confirmed.

How to Use Traits and Mutations

Traits and mutations are mostly for collection and selling. Here’s how to use them effectively:

• Selling – Golden and Diamond mutations sell for more. Check the sell price before selling.
• Collection – Many players try to collect one of every mutation for each fish.
• Trading – If trading is available, mutated fish are often more valuable.
• Quests – Some quests may ask for a specific trait or mutation.

Common Mistakes and Misconceptions

One common mistake is assuming that traits like Lucky increase the chance of getting a mutation. It does not – it only increases the chance of catching a rare fish (like a legendary). Another mistake is thinking that mutations affect catch difficulty. They do not.

Also, some players think that using a specific rod or bait increases mutation chance. There is no evidence for that. The mutation chance is the same regardless of what you use.

Frequently Asked Questions

Can a fish have both a trait and a mutation?

Yes, a fish can have both a trait and a mutation. They are independent. For example, you could catch a Golden Albino fish with the Lucky trait.

Do mutations affect the fish’s size?

No, mutations do not affect the fish’s size. Size is determined by the fish’s species and random variation.

What is the rarest mutation?

Diamond is generally considered the rarest mutation, with a very low drop rate. Golden is also rare but more common than Diamond.

Can I increase my mutation chance?

There is no confirmed way to increase the mutation chance. The Mystic trait on a fish may increase the chance for that specific fish, but it’s not guaranteed.

Do traits or mutations carry over to the next fish?

No, traits and mutations are per-fish. They do not carry over or stack across catches.

Are there any hidden traits or mutations?

Developers occasionally add new traits or mutations. The list above is based on the current known ones, but check the game’s update logs for new additions.

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in t | Number of fish caught | - | 100 | 1 | 100000
in m | Mutation chance (%) | % | 1 | 0 | 100
out expected | Expected mutations | fish | t * (m / 100) | 1
out probability | At least one mutation (%) | % | (1 - (1 - m/100)^t) * 100 | 2