Acanthodii are Unusual rarity fish available in Fisch. Based on real prehistoric spiny sharks, they're one of the easiest fish to catch in the game—making them perfect for newer players or anyone looking to fill out their collection quickly.

What Is Acanthodii

The Acanthodii is an Unusual rarity fish inspired by extinct spiny sharks that lived millions of years ago. These fish are characterized by diamond-patterned scales along their bodies and actively hunt smaller creatures in their environment. They're available any time of day or night during winter season.

When you catch one, a red exclamation mark pops above your head and a bell sound plays—the standard indicator for Unusual rarity fish.

Where to Find Acanthodii

Acanthodii spawn exclusively in the Ancient Isle location. They will bite on any type of bait and at any time during winter season.

How to Catch Acanthodii

Catching Acanthodii follows the standard Fisch fishing mechanic:

  1. Travel to Ancient Isle and equip any fishing rod.
  2. Hold down to cast your bobber into the water.
  3. Wait for a bite. You can shake your rod to attract fish faster if needed.
  4. When you feel a bite, hold down or click to pull the white bar on the fishing UI.
  5. Follow the blue line as closely as you can—minor mistakes are forgivable.
  6. Keep the bar filled until the progress meter at the bottom reaches 100%. Once full, you'll reel in your Acanthodii.
💡 Tip — Acanthodii move slowly across the fishing bar, so you have plenty of time to react. This makes them excellent for practicing your technique without pressure.

Mutations & Variations

Like all fish in Fisch, Acanthodii can spawn as rare mutations. Some documented variants include:

  • Mythical, Atlantean, and Negative mutations
  • Special size variants (Big, Giant)
  • Elemental mutations (Frozen, Nuclear, Electric, Abyssal)
  • Thematic variants (Jolly, Nightmare, Frostbitten, Gleebous, Merry)

Each mutation has a unique appearance. The rarer the mutation, the lower your odds of encountering it—but catching any variant still counts toward your progress.

Tips for Success

Use any bait: Acanthodii don't have bait preferences, so save your premium bait for pickier fish and use whatever's cheapest.

Fish during winter: Acanthodii are seasonal and only appear during winter. Plan your sessions accordingly or return when winter arrives.

💡 Tip — Since Acanthodii are Unusual rarity, they're among the quickest catches in the game. Chain multiple catches back-to-back to level up fast or farm for mutations if you're hunting a specific variant.