Mutations and Size Variants in Hole Fishing

Mutations and size variants are how Hole Fishing turns ordinary species into standout sells and collection goals. This page explains what players should expect, how the fish index feeds luck, and where this wiki stays intentionally incomplete instead of inventing odds tables.

What mutations are

A mutation is a special visual or rarity treatment on a fish beyond the base species. Mutated catches generally sell for more and feel more exciting when they appear in the bite cycle. Exact mutation names, multipliers, and rates are still being mapped by the community and can change with patches. Treat any third-party spreadsheet as provisional until you verify sell prices in your own session.

What you can rely on:

• Mutations are desirable for cash and collection.
• They appear as part of normal fishing as luck and content depth rise.
• Rod luck, index luck, night windows, and stronger holes all influence how often “special” outcomes show up—without a guaranteed formula published here.

Size variants: Large, Huge, Giant

Separately from mutations, fish can appear with size tags such as Large, Huge, and Giant. Bigger sizes usually mean better payouts and harder weight checks. That is why a rod that lands a normal Betta might fail a Giant of the same species. Size variants amplify the need to balance hole upgrades with the rods guide.

Practical tips:

• Do not panic-sell every small fish if your bag still has room—volume still funds upgrades.
• When you land a Huge or Giant, note whether your rod barely made it; that informs the next purchase.
• Size tags stack with species value; a large common can out-earn a tiny rare on a bad luck streak, but high rarity plus size is the jackpot pattern players chase.

Fish index and luck

Filling the fish index (the collection log of species you have caught) grants luck. Luck is a long-session compounder: each new entry makes future special outcomes a bit more reachable. Prioritize new species when you can do so without ignoring cash flow. Early examples players mention include Betta, Koi, Shrimp, Seahorse, Turtle, Crocodile, Octopus, and later standouts like Sawfish, Swordfish, Orfish, Void ray, Ancient turtle, or Legendary toadfish. Secret-rarity entries exist too—covered carefully in night and secrets.

Index strategy:

1. After a rod or hole jump, fish long enough to see new names before rushing the next buy.
2. Sell for cash when bag pressure rises, but remember unique first catches matter for luck.
3. Use night and server hole windows to hunt unfamiliar entries when your rod is ready.

Honest incomplete list policy

This wiki will not invent a fake complete mutation encyclopedia. We list species and ideas confirmed in public gameplay and creator videos, and we mark uncertainty clearly. If a name is missing, it may still exist in-game—go catch it and compare sell value yourself. Avoid Ice Fishing Simulator style systems; Hole Fishing’s mutation story is its own loop of hole, rod, bag, sell value, index, and night.

How mutations fit progression

Early game: any mutation or large size is a welcome cash spike toward Golden, Cactus, and Tree.

Mid game: Night rod and deeper holes raise the chance you see unusual outcomes while grinding toward Magma.

Late game: Pirate, Magic, and Hacker sessions are where mutation farming and secret hunting feel best because weight caps stop rejecting your best bites. See progression and avoid the traps in common mistakes.

Related reading

• Getting Started — sell loop and first upgrades.
• Rods Guide — weight so size variants can land.
• Tier List — priority snapshot.
• Codes — only live codes; never invented mutation codes.

Mutations reward patience and indexing. Chase them with a rod that can finish the hold, not with wishful hole spam alone.