Fish It Secret Fish Guide: How to Catch Every Rare Species

Secret fish in Fish It sit at the very top of the rarity ladder, and catching one is no small feat. With spawn rates that can drop as low as 1 in 4,000,000, these catches separate casual fishers from dedicated players who know exactly what gear to bring and where to stand. Whether you're hunting the Megalodon in the open Ocean or coordinating a lobby push for the Mutant Runic Koi, this guide gives you everything you need to stop wasting casts and start landing trophies.

What Are Secret Fish in Fish It?

Fish It uses a seven-tier rarity system: Common, Uncommon, Rare, Epic, Legendary, Mythic, and Secret. Secret fish occupy the highest tier, boasting the lowest catch rates in the entire game. Beyond the bragging rights, they sell for enormous amounts of in-game currency and are required to complete several quests.

The critical thing to understand is that Secret fish don't just have low odds — many of them won't even appear unless your setup meets specific thresholds. Equipping a basic rod and average bait won't make them spawn at all. You need to build toward the right loadout before attempting any Secret fish hunt.

Secret fish rarity tier overview

What Gear Do You Need to Catch Secret Fish?

Rods: Which One Should You Use?

Your rod is the foundation of your Secret fish setup. At minimum, you need the Midnight Rod or the Lucky Rod equipped before Secret fish will even register on your line. For meaningfully better odds, the Ghostfinn Rod is the top recommendation — you earn it by completing the Deep Sea Quest at Lost Isle.

If you're chasing the Mutant Runic Koi specifically, the rules change. That fish ignores luck entirely, so high-lure-speed rods matter more than luck-focused ones. The Diamond Rod and Element Rod are the best picks for that hunt because they let you cast and retrieve faster during the tight catch window.

Bait: What's the Best Option?

Bait has a direct impact on your luck stat, which in turn affects Secret fish spawn rates. Here's how the main options compare:

Chroma Bait is the bare minimum to get started, but Dark Matter Bait is where your efforts really pay off. If you have the coins, Singularity Bait from the Traveling Merchant pushes your luck stat further than anything else in the game.

Enchantments: How Do You Boost Your Luck Further?

Enchantments are applied using Enchant Stones at the altar inside Esoteric Depths. The two enchants you want on your rod are:

• Leprechaun I or II — flat luck boost, ideal for consistent Secret fish attempts
• Empowered I — increases both luck and lure speed simultaneously

Combining a strong enchantment with top-tier bait stacks your advantages and gives you the best possible spawn rate for most Secret fish locations.

All Secret Fish Locations in Fish It

Secret fish are spread across nearly every zone in the game. Some are tied to specific events and are currently unobtainable outside those windows. Use the table below to plan your hunting route.

For detailed spawn condition breakdowns on individual fish, the Fish It Wiki is a reliable reference that tracks location-specific requirements and updates as the game changes.

Secret fish spawn zone map

How to Catch the Mutant Runic Koi

The Mutant Runic Koi deserves its own section because it breaks every rule that applies to other Secret fish. Luck boosts, enchantments, and premium bait do nothing for this one. Its spawn system is entirely player-count based.

Where Does the Mutant Runic Koi Spawn?

Head to the Underwater Fishing Group inside the Underwater City. This is the only location where the Mutant Runic Koi can appear.

What Are the Spawn Conditions?

• Spawns once every 4 hours (in-game time)
• You have a 10-minute window to catch it once it appears
• More players in the lobby increases spawn chance
• Luck boosts have zero effect on this fish

How to Maximize Your Chances

Because the window is so short, preparation is everything. Arrive at the Underwater Fishing Group before the 4-hour mark so you're already casting when the event triggers. Bring friends or join a packed server — solo attempts are possible but far less consistent. Use the Diamond Rod or Element Rod for their fast lure speed so you can make as many casts as possible in those 10 minutes.

For a full breakdown of all secret fish locations and spawn quirks, check out this detailed secret fish location guide that covers luck mechanics and event timing in depth.

Mutant Runic Koi spawn point

Extra Tips to Push Your Odds Even Further

Beyond your core loadout, a few additional strategies can meaningfully improve your Secret fish catch rate:

• Luck Potions stack with your bait and enchantments for a combined bonus
• Totems placed near your fishing spot provide passive luck increases
• 2x Luck Server Events are the single best time to attempt the rarest fish — your effective odds double without any extra cost
• Fish during off-peak hours if you want less competition for spawn triggers in contested zones

What most players miss is that consistency matters more than a single lucky session. 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 hunters.

If you want to stay on top of new Secret fish additions and patch changes, browse more guides on GAMES.GG for the latest Fish It coverage and Roblox gaming tips.