# Medaka Aquarium Breeder — Try raise and breed killifish!

> Relaxing aquarium simulation game focused on raising and breeding killifish. (iPhone/iPad app by Yuki Naruse.)

- Source: https://appshunter.io/ios/app/medaka-aquarium-breeder/id6466660802 (this page in markdown: same URL + `.md`)
- Developer: [Yuki Naruse](https://appshunter.io/developer/1707604115)
- Category: Games, Education, Simulation, Word
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.3 · 244 MB
- Languages: American English, Japanese
- Released: 2024-07-23
- Data updated: 2026-07-17
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/medaka-aquarium-breeder/id6466660802/reviews.md

## What is Medaka Aquarium Breeder?

Medaka Aquarium Breeder is an idle breeding game where you become a medaka breeder, manage your aquarium, and raise your own medaka fish.

Adjust the water temperature and quality, feed your medaka, and watch them grow over time. Even while the app is closed, your medaka continue to grow little by little. Sell the medaka you raise to earn money, buy aquarium equipment and layout items, and create your own relaxing aquarium.

A major update has expanded the breeding and collection experience.

Main features added in the update:
- View medaka relationships and breeding routes with the genetic map
- Use Breed Points to unlock hints for undiscovered medaka and analysis for discovered medaka
- Expanded breeding patterns make it possible to discover more medaka varieties
- Seasonal Shop where you can obtain medaka inspired by spring, summer, autumn, and winter
- Expanded encyclopedia and genetic map with more detailed information about discovered medaka
- Updated Tips to make new features and breeding advice easier to understand

How to play:
- Manage water temperature and quality, and feed your medaka as they grow.
- Feeding and cleaning take only a short time, making it easy to care for your aquarium during spare moments.
- Sell raised medaka to earn money, then buy aquarium equipment and layout items.
- Pair male and female medaka to produce offspring that inherit traits from their parents.
- Use the genetic map and encyclopedia to search for medaka you have not discovered yet.
- Check in-game Tips anytime to learn about raising medaka and using each feature.

Features:
- Idle growth system where medaka continue to grow while you are away
- Aquarium layout customization with equipment, sand, aquatic plants, stones, and more
- Collection gameplay where breeding can lead to new medaka varieties
- Encyclopedia to review discovered medaka
- Genetic map to check parent-child relationships and breeding clues
- Seasonal Shop where different medaka appear depending on the season
- A calm aquarium atmosphere with water sounds and music

The medaka available in the shop are only part of what you can discover. Some medaka can only be created through breeding, and others are connected to the seasons. Think about parent combinations, unlock hints with Breed Points, and work toward completing your encyclopedia.

Recommended for players who:
- Enjoy raising games that can be played little by little
- Like aquariums and relaxing water-themed experiences
- Enjoy caring for virtual pets
- Like discovering new varieties through breeding or pairing systems
- Want to steadily complete an encyclopedia or collection
- Want a calm game to enjoy during breaks or quiet moments

Raise medaka, breed new varieties, expand your encyclopedia, and create your own aquarium.

## Key features

- Manage aquarium water quality and temperature
- Feed and grow killifish
- Sell fish to earn money
- Breed new killifish species
- Customize aquarium with equipment and layouts
- Offline play available

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/medaka-aquarium-breeder/id6466660802/reviews.md

### 5/5 — Odd but addicting

*2026-06-19*

after you understand the gameplay loop, it’s incredibly addicting and easy to play. I can’t stop playing

**Developer response:** Thank you so much for playing the game. We have a major update planned, so please be sure to check it out.

### 5/5 — メダカ図鑑を埋めてしまった。

*2025-06-18, version 1.3.1*

もう少しメダカの種類を増やしてほしい。
3週間程度でクリアしてしまったので、他のメダカの種類を追加してほしい。
完成したメダカ図鑑には、掛け合わせの答え合わせを書いていてほしい。

### 5/5 — 放置で楽ちん

*2024-08-17, version 1.3.1*

ちょっとの時間でゆっくりできるのでオススメです！

### 5/5 — いろいろなメダカが産まれるので楽しいです！！

*2024-07-29, version 1.1*

オスとメスの組み合わせによって、いろいろなメダカが産まれるので楽しいです！！　　ついついやり続けてしまいます。

## Frequently asked questions about Medaka Aquarium Breeder

### How do I play Medaka Aquarium Breeder?

You manage the aquarium's water temperature and quality, and feed your killifish. They will grow on their own, and you can sell them to earn money for upgrades and new species. Tips are available in-game to help you learn.

### Can I play Medaka Aquarium Breeder offline?

Yes, Medaka Aquarium Breeder can be played offline. This makes it a convenient option for those who want to enjoy a relaxing game without a constant internet connection.

### How often do I need to feed the killifish in Medaka Aquarium Breeder?

You only need to feed the killifish at least once every three days. The game is designed to be low-maintenance, allowing you to enjoy it even with a busy schedule.

### How do I create new species in Medaka Aquarium Breeder?

New species of killifish can be created through couplings. By combining different killifish and using various layout materials, you can discover and breed unique varieties to complete your collection.

### What kind of content can I customize in Medaka Aquarium Breeder?

You can customize your aquarium by purchasing and arranging various equipment and layout materials. This allows you to create a visually appealing underwater world for your killifish.

### Does Medaka Aquarium Breeder have ads?

Yes, Medaka Aquarium Breeder contains advertisements. These ads are part of the free-to-play model, allowing users to enjoy the game without an upfront cost.

### What devices is Medaka Aquarium Breeder available on?

Medaka Aquarium Breeder is available on iPhone, iPad, and iPod. It is designed for iOS devices, offering a consistent experience across Apple's mobile platforms.

### How often is Medaka Aquarium Breeder updated?

The latest version of Medaka Aquarium Breeder is 1.3.2, and it was last updated on January 23, 2026. This indicates a recent update, suggesting ongoing support and potential for new content.

## Version history (last 5 releases)

### 2.0.0 — 2026-07-01

A major update has expanded the breeding and collection experience.

- Added the Genetic Map to show medaka relationships and breeding routes
- Added Breed Points for unlocking hints and analysis
- Expanded breeding patterns and discoverable medaka varieties
- Added the Seasonal Shop
- Expanded the encyclopedia and Genetic Map information
- Updated Tips with new feature explanations and breeding advice

### 1.3.2 — 2026-01-23

We have revised the age restriction designation. We have set the marketing URL.

### 1.3.1 — 2024-08-16

The rewards earned from reward advertising are clearly indicated in an easy-to-understand manner.

### 1.3 — 2024-08-14

Modified notation and UI to make reward ads easier to understand.

### 1.2 — 2024-08-12

Fine-tuned UI.

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## More apps by Yuki Naruse

- [Escape from the Pirates Ship](https://appshunter.io/ios/app/escape-from-the-pirates-ship/id6511245420)
- [AdventureChronicleEscapeGame](https://appshunter.io/ios/app/adventurechronicleescapegame/id6756542448)

All apps by Yuki Naruse: https://appshunter.io/developer/1707604115

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*