Mutations are one of the most valuable systems in Fish It!, transforming normal fish into special, higher-selling versions with glowing effects and bonus stats.
Each mutation increases the coin value of your catch — and some, like Galaxy or Midnight, can multiply profits by several hundred percent.
If you’re aiming for quick money, shiny collections, or completing your Index, understanding how mutations work is key to maximizing your time out on the water.
How to Get Mutations
Mutations occur randomly whenever you catch a fish. The chance increases with:
- High Luck stats from your Fishing Rods and Bobbers
- Active Mutation Potions (from redeeming Fish It Codes)
- The Mutation Hunter Enchant (from the Enchant Guide)
- Global or event boosts
You can also stack these effects for maximum efficiency — using the Mutation Hunter II enchant on an Ares Rod with Corrupt or Aether Bait gives the highest known chance.
All Mutation Types in Fish It
Here’s every confirmed mutation currently in the game (as of November 2025), listed by their sell multiplier and rarity impact.
| Mutation Name | Sell Multiplier | Description |
|---|---|---|
| Stone Mutation | +20% | Basic mutation, minor bonus — easy to get early. |
| Frozen Mutation | +100% | Fish appear crystallized; solid mid-tier multiplier. |
| Ghost Mutation | +150% | Pale blue glow; common among deep-sea catches. |
| Fairy Mutation | +180% | Bright pastel shimmer; highly valuable. |
| Radioactive Mutation | +200% | Green aura; doubles your fish’s base value. |
| Lightning Mutation | +220% | Yellow electric sparks; fast bite visuals. |
| Midnight Mutation | +280% | Dark-blue glow, often rare; premium-tier bonus. |
| Gemstone Mutation | +280% | Color-shifting shine, visually rare, top-tier seller. |
| Galaxy Mutation | +450% | The rarest and most valuable mutation — ultra-bright space-like glow. |
(Drop rates vary, but rare mutations such as Galaxy or Midnight are estimated to appear once per several hundred catches even with Mutation boosts.)
Best Mutations (Tier Ranking)
| Tier | Mutation | Notes |
|---|---|---|
| S-Tier | Galaxy, Gemstone, Midnight | Highest sell value and rarity; best for endgame farming. |
| A-Tier | Lightning, Radioactive | Excellent for mid-to-late game with strong Luck setups. |
| B-Tier | Fairy, Ghost | Solid early-game options, good Luck synergy. |
| C-Tier | Frozen, Stone | Common and weaker, but useful early for steady gold. |
How to Farm Mutations Efficiently
If you want to farm mutations consistently, stack multiple effects that boost rarity and mutation rolls:
1. Equip the Right Rod
Use late-game rods like:
- Ares Rod
- Angler Rod
- Ghostfinn Rod
All offer excellent synergy with enchantments and baits.
→ Learn more: Fishing Rods Guide
2. Use High-Luck Bobbers
Bobbers such as:
- Aether Bait
- Corrupt Bait
- Royal Bait
provide extra Luck and Mutation Chance.
→ See: Bobbers (Bait) List
3. Enchant Your Rod
Apply Mutation Hunter II or Cursed from the Enchant System.
- Mutation Hunter II: +30% Mutation Chance
- Cursed: -75% Luck, but +75% Mutation Chance
If you’re purely mutation farming, Cursed + Aether Bait is one of the strongest builds.
4. Use Boats for Better Spots
Certain islands and deep-sea areas (like Lost Isle and Esoteric Depths) have higher rates for rare fish — which also improve mutation odds.
→ Find the best options here: Boats Guide
5. Use Codes and Potions
Redeem active codes for Mutation and Luck Potions through the Fish It Codes Page.
These temporary boosts can double your results during events or update periods.
Mutation Farming Build Example
| Slot | Recommended Item | Effect |
|---|---|---|
| Rod | Ares Rod | High Luck & Weight |
| Bobber | Aether Bait | Mutation + Luck Boost |
| Enchant | Mutation Hunter II | +30% Mutation Chance |
| Potion | Mutation Potion | Temporary increase |
| Location | Lost Isle or Esoteric Depths | Best for rare rolls |
(Optional: Add a Gold Digger Enchant if you want to maximize sell value instead of mutation rate.)
Mutation Profit Comparison
| Mutation | Multiplier | Sell Example (Base 1,000 coins) |
|---|---|---|
| Stone | +20% | 1,200 coins |
| Frozen | +100% | 2,000 coins |
| Ghost | +150% | 2,500 coins |
| Fairy | +180% | 2,800 coins |
| Radioactive | +200% | 3,000 coins |
| Lightning | +220% | 3,200 coins |
| Midnight | +280% | 3,800 coins |
| Gemstone | +280% | 3,800 coins |
| Galaxy | +450% | 5,500 coins |
Best Islands for Mutation Fishing
| Island | Reason |
|---|---|
| Lost Isle (Treasure Room) | High rare fish spawn; synergizes with Mutation builds. |
| Esoteric Depths | Can drop Enchant Stones while mutation farming. |
| Ancient Jungle | Mythic fish with high base sell value make multipliers stronger. |
| Coral Reefs | Great for mid-game farming with bright mutation visuals. |
→ Find fish spawn details here: Complete Fish Locations Guide
Mutation Visual Effects
Each mutation changes your fish’s look:
- Stone: Solid gray tone
- Frozen: Icy texture and shimmer
- Ghost: Faint glowing outline
- Fairy: Pink-blue light aura
- Radioactive: Neon green glow
- Lightning: Electric flashes
- Midnight: Deep blue hue
- Gemstone: Reflective, color-shifting surface
- Galaxy: Cosmic nebula effect with stars
Mutations make fishing in Fish It! far more exciting — every cast could land a fish worth ten times more than normal.
If your goal is money, aim for Galaxy or Gemstone catches. If you enjoy collection hunting, experiment with all mutation types using Luck and Mutation builds.
Pair your enchanted rods with rare baits, stay alert for code drops, and always fish where rare species spawn for the highest return.
For deeper mastery, explore these related pages: