Secret fish in Fish It represent the absolute pinnacle of the rarity system, and landing one demands precision. Spawn rates bottom out at 1 in 4,000,000 for certain species, which means you can't brute-force your way through with volume alone. You need the right rod, the correct bait, and an understanding of how spawn mechanics actually work. This guide breaks down the exact requirements for every Secret fish in the game, from the Megalodon prowling the Ocean to the lobby-dependent Mutant Runic Koi.
What Are Secret Fish in Fish It?
Fish It divides catches into seven tiers: Common, Uncommon, Rare, Epic, Legendary, Mythic, and Secret. Secret fish sit at the top with the lowest spawn probabilities in the game. They also command the highest sell prices and unlock multiple quest completions.
The key detail: Secret fish won't spawn at all if your gear doesn't hit minimum thresholds. Casting with entry-level equipment produces zero results. Build your loadout deliberately before you start grinding.
Secret fish rarity tier overview
What Gear Do You Need to Catch Secret Fish?
Rods: Which One Should You Use?
You need at minimum the Midnight Rod or Lucky Rod before Secret fish register as possible catches. For better odds, the Ghostfinn Rod is the best general-purpose option. You unlock it by finishing the Deep Sea Quest at Lost Isle.
The Mutant Runic Koi breaks this pattern. It ignores luck completely, so lure speed becomes the deciding factor. The Diamond Rod and Element Rod excel here because they let you cycle casts faster during the limited spawn window.
Bait: What's the Best Option?
Bait directly modifies your luck stat, which controls Secret fish spawn rates. Here's the breakdown:
Chroma Bait gets you in the door. Dark Matter Bait is where results start showing up consistently. If you can afford it, Singularity Bait from the Traveling Merchant delivers the highest luck multiplier available.
Enchantments: How Do You Boost Your Luck Further?
Apply enchantments using Enchant Stones at the altar in Esoteric Depths. The two you want:
- Leprechaun I or II — flat luck increase, best for sustained Secret fish attempts
- Empowered I — boosts both luck and lure speed at once
Stack a strong enchantment with premium bait to maximize spawn rates across most Secret fish zones.
All Secret Fish Locations in Fish It
Secret fish appear across almost every zone. Some are locked to specific events and can't be caught outside those windows. Use this table to map your route.
For spawn condition details on individual fish, the Fish It Wiki tracks location-specific requirements and stays current with game updates.
Secret fish spawn zone map
How to Catch the Mutant Runic Koi
The Mutant Runic Koi operates on completely different rules. Luck boosts, enchantments, and premium bait do nothing. Its spawn depends entirely on player count.
Where Does the Mutant Runic Koi Spawn?
Go to the Underwater Fishing Group inside the Underwater City. This is the only spawn point for the Mutant Runic Koi.
What Are the Spawn Conditions?
- Spawns once every 4 hours (in-game time)
- You get a 10-minute window to catch it after it appears
- More players in the lobby increases spawn chance
- Luck boosts have zero effect
How to Maximize Your Chances
Arrive at the Underwater Fishing Group before the 4-hour mark so you're already casting when the window opens. Join a full server or bring friends. Solo attempts work but are far less reliable. Use the Diamond Rod or Element Rod for fast lure speed to maximize casts in the 10-minute window.
For complete spawn mechanics and timing breakdowns, this detailed secret fish location guide covers luck systems and event windows thoroughly.
Mutant Runic Koi spawn point
Extra Tips to Push Your Odds Even Further
Beyond core gear, a few additional tactics can improve your Secret fish catch rate:
- Luck Potions stack with bait and enchantments for a combined bonus
- Totems placed near your fishing spot provide passive luck increases
- 2x Luck Server Events are the best time to attempt the rarest fish. Your effective odds double without extra cost
- Fish during off-peak hours if you want less competition for spawn triggers in contested zones
Consistency beats lucky streaks. Set up the strongest loadout you can afford, target one zone at a time, and grind with patience. The Ghostfinn Rod paired with Dark Matter or Singularity Bait and a Leprechaun II enchantment is the benchmark setup for serious Secret fish hunting.
For updates on new Secret fish additions and patch changes, browse more guides on GAMES.GG for the latest Fish It coverage and Roblox gaming tips.