# Medaka Breeder — you can raise & breed medaka

> Realistic virtual fish breeding and aquarium simulation game. (iPhone/iPad app by Taiho Yanase.)

- Source: https://appshunter.io/ios/app/medaka-breeder/id6453882680 (this page in markdown: same URL + `.md`)
- Developer: [Taiho Yanase](https://appshunter.io/developer/1699588464)
- Category: Games, Entertainment, Casual, Simulation
- Price: Free
- Rating: 4.73/5 from 11 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 91 MB
- Languages: English, Japanese
- Released: 2023-09-10
- Data updated: 2026-07-08
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/medaka-breeder/id6453882680/reviews.md

## What is Medaka Breeder?

[Game Features]
You can experience realistic killifish keeping in your phone.
Taking care of your killifish is very easy: just feed them once every three days and clean the tank.
The killifish will eventually grow over time and breed with other adult killifish (2cm or larger).
The killifish born from the breeding will inherit the characteristics of their parents.

A maximum of 50 killifish can be kept.
Up to 10 killifish can be kept in one tank,
Up to 5 aquariums can be set up.

Functions
■Mode switching
Default: Information on the killifish and aquarium is displayed, allowing the user to check the status of their care.
Observation: Hides the display of information, allowing you to closely observe the aquarium and killifish.
　　　You can also tap on the water surface or the aquarium area to see if there is any reaction!
Shooting: This function is useful when you want to hide the information and buttons and take pictures of only the killifish and the aquarium.

■Name your killifish
You can name each killifish.
You can name each killifish so that even if you have a lot of killifish, you will never lose track of them.

Layout of the aquarium
You can keep your killifish in your favorite decorated aquarium.
There are a total of five types of layouts.

Layout types: tank appearance, bottom sand, stones, plants, and ornaments.

■ Shop
You can purchase killifish, aquariums and ornaments.
There are 46 types of killifish sold in the store!

■Missions
You can receive rewards by accomplishing various missions.
You can purchase more items such as killifish and aquarium tanks by challenging many missions.

■Revival Chance
If you are too busy to take care of your killifish and let them die, don't worry!
You can bring them back to life with the Resurrection Chance!

Premium Pack (paid feature)
Clear ads from auto-display.
  - Eliminate banner ads
  - Eliminate interstitial ads
Relief mode is released (can be switched).
  - killifish won't die.
Useful functions added
  - Collective feeding
  - Collective cleaning
All items can be purchased
Daily mission rewards tripled
50,000 G present

## Key features

- Realistic killifish keeping simulation
- Breed fish and inherit traits
- Customize aquariums with decorations
- Collect over 46 types of killifish
- Missions and rewards system
- Observation and shooting modes

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/medaka-breeder/id6453882680/reviews.md

### 5/5 — Very good

*2025-06-10*

I’ve been playing for a bit, and this is the best game of the sort that I’ve found. Just two things though. 1.  Ads. You get an ad every time you collect quest rewards, every time you rename a fish etc etc. It’s a bit much. And you are not able to collect those quest or achievement rewards without Wi-Fi, so you just sit through a ton of ads. 2. Prices. I get that you need to make money of course, but you don’t get too much a day, and there are no mini games to earn more. Also, I’m not sure if it’s just me, but I am not able to purchase/see the price of that pack in the shop, the one to remove adds and stuff? Anyways, sorry for the long review, and thank you for the game :).

### 3/5 — To expensive

*2024-09-08*

Every thing is to expensive and

### 5/5 — So far I’m excited about this game!

*2023-11-13*

This is exactly what I’ve been looking for in fish breeding games. I’m a huge genetics fanatic and had guppies for a while in my home and I miss having them terribly. This game gives me my fix! I love seeing them grow and am really excited to see what breeding outcomes exist! I hope you continue to improve the game and keep adding new combinations and types of the fish in the game! Thank you for making this game!

**Developer response:** Thank you very much for your high evaluation review. We are very pleased that you enjoyed this game. We look forward to working with you in the future.

## Frequently asked questions about Medaka Breeder

### How do I take care of my Medaka fish?

Caring for your Medaka fish is simple. You need to feed them once every three days and clean their tank regularly. The fish will grow and breed on their own over time.

### Can Medaka fish die in the game?

Yes, Medaka fish can die if not properly cared for. However, a 'Resurrection Chance' feature is available to bring them back to life if you are too busy to attend to them.

### What are the limits on the number of fish and aquariums in Medaka Breeder?

You can keep a maximum of 50 killifish in total. Up to 10 killifish can be housed in a single tank, and you can set up to 5 different aquariums.

### How does the breeding system work in Medaka Breeder?

Adult killifish (2cm or larger) will breed with each other. The offspring will inherit the characteristics and traits of their parent fish, allowing for diverse genetic outcomes.

### What customization options are available for aquariums in Medaka Breeder?

You can customize your aquariums with five different layout types: tank appearance, bottom sand, stones, plants, and ornaments. This allows you to create a personalized environment for your fish.

### Does Medaka Breeder have ads?

The base game does not display advertisements. However, a 'Premium Pack' is available as a paid feature that can clear ads if they were to be implemented in the future, and offers other benefits.

### What is included in the Premium Pack for Medaka Breeder?

The Premium Pack offers several benefits, including clearing ads, unlocking 'Relief Mode' where fish won't die, collective feeding and cleaning functions, tripled daily mission rewards, and a starting gift of 50,000 G.

### How often is Medaka Breeder updated?

The game was last updated on October 25, 2023, indicating active development and support from the developer.

## Version history (last 5 releases)

### 1.1.3 — 2023-10-25

Adjusted the growth speed of killifish when they reach 4 cm or more to be much faster than before.
Fixed a bug in displaying a dialog in the killifish list when a killifish has died.
Fixed other minor bugs.

### 1.1.2 — 2023-09-20

Fixed minor bugs

### 1.1.1 — 2023-09-11

Adjusted the colors of the background wall and table.
Fixed a bug that caused the screen to darken and become inoperable on rare occasions.

### 1.1.0 — 2023-09-10

Added a button to switch languages on the options screen.

### 1.0.3 — 2023-09-07

No release notes.

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## Related topics

[breeder game](https://appshunter.io/ios/topics/breeder-game)

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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 2026-07-08.*