Koi Description
Appearance
The Koi resembles its real-life counterpart, having a primarily white body and black and orange spots in its normal color variant.
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Did You Know?
This section is a trivia section.
Please relocate any relevant information into other sections of the article.
1. The Koi and Mochi Mouse pets are currently the only pets that can have different colors, making them the most vibrant pets in the game.
2. The Koi, like the Seal, is locked behind a maximum of 8% chance. Unlike the Seal, due to being a shop pet, they cannot be hatched heavy and grown large enough to reach this limit. Meaning the only way to reach their ability ceiling is through glitches or stacking enough passive boosters. The highest potential for a Lucky Hatch is 64% (8 x 8) (for now can be reached only with a full team of rainbow maxed out koi fishes with base weight above 1kg + pet toys + grandmaster sprinkler) .
3. The Koi's ability description in the shop used to be different, and it was said to increase egg hatch luck instead of having a chance to refund an egg. However, in the player's inventory, it would have the same ability as it does now.
4. The Koi's value used to be bugged, showing as 
0 when asking Raphael.
0 when asking Raphael.5. On 7/26/2025, 7 hours before Update 1.16.0, the Koi received a massive buff in which the pet's recovery rates of an egg more than quadrupled (~0.7% --> ~3.2%).
6. Koi variants will sometimes mix up, making it look like an entirely new variant.
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How It Works
Fish of Fortune: When hatching eggs, there is a (0.22 * Weight + 3)% chance to get the egg back.
Cannot recover Premium/Exotic/Rainbow Eggs.
Upon successful activation, the egg is not refunded to the inventory but instead placed back in the place it was hatched from.
Best For
- Egg conservation strategy with up to 64% total recovery rate using multiple Koi
- Resource management for expensive eggs like Divine Egg and Culinarian Chest pets
- AFK egg hatching optimization - automatic egg replacement without manual intervention
- Event pet farming where egg efficiency matters more than raw hatch speed
Pro Strategies
Eight-Koi Army Formation
Deploy 8 Koi pets simultaneously for maximum egg recovery rates. Each Koi provides ~8% recovery chance (at max weight), creating 64% total recovery rate when stacked. This means 2 out of 3 eggs return on average, making expensive egg farming sustainable. Position all 8 Koi centrally to ensure they affect all hatching locations.
Weight Optimization Strategy
Level each Koi to maximum weight for peak 8% individual recovery rate. Use Pet Toys and Nihonzaru buffs to boost the Fish of Fortune ability further. The formula (0.22 × Weight + 3)% means heavy Koi are exponentially more valuable than light ones for egg conservation.
Selective Egg Management
Focus Koi strategy on Standard, Rare, Epic, Legendary, Divine eggs only. Since Koi cannot recover Premium/Exotic/Rainbow eggs, use them strategically for farmable eggs while manually managing premium purchases. Create separate hatching zones for premium eggs without Koi coverage.
Event Timing Synchronization
Activate Koi army setups during major events when egg demand is highest. During Zen Event farming or Culinarian Chest grinding, the egg recovery becomes crucial for maintaining sustainable farming loops without depleting egg inventory.
Alternatives
Budget: Single Koi + Manual Egg Management
Cost: One Koi from Zen Shop vs building full army
Tradeoff: 8% recovery vs 64% but requires less Zen Event grinding
Common Mistakes
- Using Koi on Premium/Exotic/Rainbow eggs (they cannot be recovered)
- Placing only 1-2 Koi instead of full 8-pet army for maximum efficiency
- Not leveling Koi to maximum weight - recovery rates scale heavily with pet size
- Mixing Koi strategy with premium egg hatching in same location
Advanced Tips
- Combine with Grandmaster Sprinkler for additional pet toy effects
- Use Pet Slots to quickly switch between Koi army and other pet setups
- Monitor the 64% recovery rate - if you're not getting ~2/3 eggs back, check Koi positioning
- During Update 1.16.0 buff, Koi became ~4x more effective - one of the most significant pet buffs ever