How to Get Lucky Gold Mutation in Fisch (March 2026) 5 Methods
The Lucky Gold mutation in Fisch is a limited-time fish mutation introduced during the St. Patrick’s Day event (March 14–21,…
The Mutant Runic Koi is the newest secret fish in Fish It’s Aquatic Machine update.
Unlike most secret fish that lean on personal Luck, this one uses a community mechanic
: the more players fishing alongside you, the better your odds. Here’s everything you
need to catch it efficiently.
| Key Info | Details |
|---|---|
| Fish Type | Secret Rarity |
| Location | Underwater City |
| Event | Group Fishing Event |
| Event Frequency | Every 4 hours |
| Luck Dependency | Low — crowd size matters more |
| Best Boost | Atlantis Machine (Luck, Big Catch, Shiny) |
Getting the Mutant Runic Koi requires being at the right place, at the right time,
with as many players as possible. Here’s the step-by-step breakdown.
The Mutant Runic Koi only spawns at Underwater City — no other location works.
Make sure you’re using a Diamond Rod or better, as lower-tier rods won’t reach
secret-rarity fish in this zone.
The Group Fishing Event runs on a fixed schedule, repeating every 4 hours.
When it goes live, a server-wide announcement appears. This is your only window
to encounter the Mutant Runic Koi.
What makes this fish unique is that your personal Luck stat is secondary.
What actually drives spawn chances is the number of players actively casting
lines simultaneously. More anglers = higher probability the Runic Koi shows up.
Once the event begins, cast your line and keep fishing without stopping. Every
active player in the session contributes to raising the Mutant Runic Koi’s
appearance chance. Leaving early cuts the whole server’s odds. Bring friends,
recruit from the lobby — the goal is maximum concurrent fishers.
Before the event timer hits zero, visit the Atlantis Machine inside Underwater
City. Donate fish to earn points, which unlock server-wide temporary boosts:
| Boost Type | Effect |
|---|---|
| Luck Boost | Higher chance at rare fish |
| Big Catch Boost | Increases weight/size of catches |
| Shiny Boost | Improved shiny fish spawn rate |
These boosts last 30 minutes to 1.5 hours, so timing matters. Activate the
booster right before the event starts for maximum overlap. For more on luck-stacking
in Roblox fishing games, check our
Fisch Weather & Admin Events guide.
It’s a Secret-rarity fish added in the Aquatic Machine update. It only appears
during the Group Fishing Event at Underwater City and requires multiple players
fishing simultaneously to have a chance of spawning.
The event repeats every 4 hours on a fixed schedule. A server announcement
appears when it’s live — stay at Underwater City and watch for the notification.
Less than usual. The main factor is how many players are actively fishing during
the event. That said, stacking Atlantis Machine boosts before the session still
improves your overall odds meaningfully.
Yes, and you should. Donate fish to the Atlantis Machine before the event to
activate Luck, Big Catch, and Shiny boosts. Time it so the buffs are active
when Group Fishing begins.
Based on current Aquatic Machine patch notes, it’s tied to the recurring Group
Fishing Event mechanic. Always check the official Fish It Discord for changes.
Our Evil Sigil in Fisch guide
also covers how limited-time mechanics work in similar Roblox fishing games.
