Updated: January 2026

🐠 Heartopia Rare Fish Guide

Complete guide to catching Heartopia's rarest fish! Learn where to find legendary fish, rainbow weather exclusives, and Mermaid Attractor spawns.

πŸ‘‘
1
Legendary Fish
🌈
10+
Rainbow Weather
πŸ§œβ€β™€οΈ
3
Mermaid Attractor
🌧️
5+
Rainy Weather

πŸ“‹ Table of Contents

πŸ‘‘ Legendary Fish

The rarest fish in all of Heartopia. Currently there's only one legendary fish β€” the mystical Koi!

🐟

Koi

LEGENDARY

The most elusive fish in Heartopia. A beautiful ornamental carp with stunning colors.

πŸ“ Location
Secret Pond
πŸ• Time
Midnight (12AM-6AM)
🌀️ Weather
Any Weather
πŸ“Š Level
Fishing Level 10

πŸ”‘ How to Find the Secret Pond

The Secret Pond is a hidden location. Look for it near the Forest Lake area β€” it's accessible after reaching certain progression milestones. Fish here at midnight for your best chance!

🌈 Rainbow Weather Fish

These rare fish only spawn during Rainbow Weather. Check your TV forecast or smartwatch to prepare!

🌈 Rainbow Weather Info

  • β€’ Starts at 6:00 PM server time
  • β€’ Lasts for a few hours
  • β€’ Check your in-house TV for weather forecast
  • β€’ Rainbow typically follows after rain
Fish Location Time Level
🐟 Bluefin Tuna East Sea / Sea Event All Day Lv.9
🐟 Swordfish Zephyr Sea / Sea Event All Day Lv.9
🦈 Smooth Hammerhead Sea Fishing All Day Lv.8+
πŸ¦€ Golden King Crab Sea Fishing All Day Lv.7+
🐟 European Eel Old Sea Evening Lv.6+
🐟 Blackspot Seabream Zephyr Sea 6PM-12AM Lv.5+
🐟 Chum Salmon Tranquil River All Day Lv.4+
🐚 Large Pearl Mussel Forest Lake All Day Lv.3+
🐟 Tub Gurnard East Sea All Day Lv.5+
🐟 Largemouth Bass Forest Lake All Day Lv.3+

πŸ’° Top Priority: Bluefin Tuna and Swordfish are the most valuable rainbow-only fish. Rent a boat and use Mermaid Perfume to maximize your haul!

πŸ§œβ€β™€οΈ Mermaid Fish Attractor Exclusives

These rare fish can only be caught using the Mermaid Fish Attractor in multiplayer mode!

πŸ§œβ€β™€οΈ How Mermaid Attractor Works

  1. 1. Buy Mermaid Fish Attractor from Vanya (unlocks at Fishing Lv.4)
  2. 2. Play with friends nearby (multiplayer required)
  3. 3. Both players use Attractors simultaneously
  4. 4. Look for blue flashing fish shadow β€” only the attractor user can catch it
🐸

Edible Frog

Lakes Only
Mermaid Attractor Required
🐟

Tilapia

Rivers Only
Mermaid Attractor Required
🐠

Rabbit Fish

Ocean Only
Mermaid Attractor Required

🌧️ Rainy Weather Fish

These fish spawn during rainy weather (also works in rainbow weather):

Fish Location Time Weather
🐟 Northern Pike Forest Lake All Day 🌧️ Rainy
🐠 Goldfish Meadow Lake 6AM-6PM 🌧️🌈 Rain/Rainbow
🐟 Butterfly Koi Meadow Lake All Day 🌧️🌈 Rain/Rainbow
🐚 Large Pearl Mussel Forest Lake All Day 🌧️🌈 Rain/Rainbow
🐟 Blackspot Seabream Zephyr Sea 6PM-12AM 🌧️🌈 Rain/Rainbow

🎣 How to Catch Rare Fish

Basic Steps

  1. 1 Equip your Fishing Rod from your toolbox
  2. 2 Find fish shadows in the water β€” bigger = rarer fish
  3. 3 Cast in front of the shadow β€” hold to aim precisely
  4. 4 Reel in when fish bites β€” hold the reel icon
  5. ! If line turns RED β€” release immediately to prevent snap!

πŸ’‘ Rare Fish Signs

  • β€’ Larger shadows = higher chance of rare fish
  • β€’ Shimmering/sparkling shadows may indicate special fish
  • β€’ Blue flashing shadow = Mermaid Attractor exclusive

πŸ’‘ Pro Tips for Rare Fish

βœ… Do

  • β€’ Check weather forecast daily β€” prepare for rainbow days!
  • β€’ Upgrade Rod Maintenance skill first to prevent rod breaking
  • β€’ Use Mermaid Perfume during rainbow weather for more spawns
  • β€’ Rent a boat for sea fishing β€” larger shadows spawn in deep water
  • β€’ Fish at night (6PM-6AM) for many rare fish
  • β€’ Play with friends for Mermaid Attractor exclusive fish

❌ Don't

  • β€’ Miss rainbow weather β€” it only lasts a few hours!
  • β€’ Force the reel when line is red β€” instant snap
  • β€’ Sell all rare fish β€” keep one of each for encyclopedia
  • β€’ Ignore fishing level β€” some fish won't spawn until higher levels

πŸ“ˆ Skill Priority for Rare Fish

1
πŸ”§ Rod Maintenance
Prevents rod from breaking during long fights
2
⭐ Fish Quality
Higher star fish = more gold per catch
3
🎯 Catch Rate
Reduces fish escape chance

πŸ“š Related Guides

Sources: Gam3s.gg, NeonLightsMedia, VG247, Sportskeeda, Eurogamer, TheGamer (January 2026). Fish spawn conditions may vary with updates. This is an unofficial fan guide.