# Jellyfish Aquarium - Pet Game

> Virtual pet simulation game where you raise and care for a digital jellyfish. (iPhone/iPad app by Hiroki Yamada.)

- Source: https://appshunter.io/ios/app/jellyfish-aquarium-pet-game/id1050599544 (this page in markdown: same URL + `.md`)
- Developer: [Hiroki Yamada](https://appshunter.io/developer/491381849)
- Category: Games, Lifestyle, Simulation, Word
- Price: Free
- Rating: 4.70/5 from 262 App Store ratings · 135 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 126 MB
- Languages: Korean, German (Germany), European Spanish, American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan), French (France)
- Released: 2015-10-31
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/jellyfish-aquarium-pet-game/id1050599544/reviews.md

## What is Jellyfish Aquarium?

Over one million downloads worldwide!
Introducing the 「Jellyfish」 to this already popular game!  FREE DOWNLOAD!  It's real easy to raise your own pet in this game!!

■Raise your own Jellyfish on your smartphone.
■Watch how cute your Jellyfish moves.  It's so soothing and therapeutic.

[Instructions]
This is a virtual pet app where you can raise your very own Jellyfish on your smartphone.  It`s so easy to raise.  Just feed your pet once every four days and clean its home once a week.  This game app is great for kids and people who find RPG's and puzzle games a bit tedious.  Try this game out!  It's therapeutic, and a great way to kill time!

[Basic Functions]
・It's simple to raise.  Just remember to feed you Jellyfish and clean its home.
・Like a real Jellyfish, it moves around in such an adorable way.
・You can call over your Jellyfish by tapping on the screen.  Look at how adorable this is!
・You can give your Jellyfish a name.  You can give it a new name at anytime.
・Your Jellyfish grows in realtime.  The growth of your pet is calculated by every 0.5 second.  
・The game records how much your pet has grown since the last time you visited it.
・You can take a picture of your Jellyfish with your mobile device and share it with your friends over various social networking sites.
・The app also can send you notifications to let you know when your pet needs feeding and cleaning.
・You can even transfer your pet's data to a new device so that you can keep the same pet even after you change your mobile device.
・All of these functions are free and do not require any microtransactions!

[Recommended for:]
・people who have always wanted a Jellyfish or already have one and want a virtual Jellyfish to spend time with everywhere and at anytime
・people who love visiting the zoo and aquariums
・people who love raising virtual pets
・people who want a simple game to pass their free time with something fun

## Key features

- Raise a virtual jellyfish pet
- Feed and clean your pet
- Watch cute jellyfish movements
- Name and customize your pet
- Real-time growth tracking
- Share photos of your pet
- Pet care reminders

## What do users think of Jellyfish Aquarium?

Overall sentiment: positive

**Pros**

- 🎵 Beautiful, relaxing music and soundtrack
- 🎨 Stunning graphics and visual design
- 😌 Calming and stress-relieving gameplay
- 🧘 Perfect for meditation and relaxation
- 💡 Simple, easy-to-understand mechanics
- 🎚️ Customizable lighting options
- 📱 Low-maintenance pet simulation
- 🌙 Ideal for falling asleep to
- 👶 Suitable for all ages
- 🎮 Multiple music tracks to choose from
- 📈 Realistic real-time growth progression
- 🎯 Engaging watch mode feature
- 💰 Minimal ads during normal gameplay
- 🐟 Adorable jellyfish animations
- 🧠 Teaches responsibility and consistency

**Cons**

- 📺 Ads appear when changing water
- ⚠️ Jellyfish dies too easily/quickly
- 😢 Emotional distress when pet dies
- 🔄 Repetitive gameplay loop
- 🚫 Cannot name jellyfish
- 🚫 Cannot customize tank
- 📦 Limited tank size constraints
- ⏰ Insufficient reminder notifications
- 🐛 Unexpected death without warning
- 👧 Misogynistic description in Chinese version
- 🔊 Ads play despite phone being silent
- ⏱️ Slow growth rate
- 🎮 Limited interactive features

**Commonly reported bugs**

- Jellyfish dies unexpectedly after long ownership
- Death occurs without sufficient warning notifications
- Inconsistent hunger notification timing
- App crashes or freezes
- Ads play when phone is on silent mode

**Most requested features**

- Larger or upgradeable tank size
- Ability to name the jellyfish
- More interactive activities with pet
- Tank customization options
- Better reminder system for feeding
- Multiple jellyfish ownership
- Tank decoration/personalization
- Reduced ad frequency
- More activities beyond feed and clean
- Gradual tank upgrades at milestone days

## Recent user reviews (10 of 135)

All indexed reviews: https://appshunter.io/ios/app/jellyfish-aquarium-pet-game/id1050599544/reviews.md

### 5/5 — jelli

*2026-06-17, version 5.0*

my peace.

### 4/5 — Death

*2026-06-12*

I miss my jellyfish so much. It was 163 days, and i spent less time on my phone and forgot to feed and clean the tank. I wish there was an option to go back, or have any option to look at them one more time.

### 3/5 — A few suggestions

*2026-06-01*

Honestly the game is great! The music is beautiful, the art is amazing, and the jellyfish are adorable. I do have a few suggestions though. If they die, I think there should be a page on screen where it shows how long they lived along with how their health was. And when the jellyfish gets too big for its tank, you should be able to zoom the screen out to make the tank bigger

### 5/5 — Nice game

*2026-05-12, version 5.0*

Really nice! I love my jellyfish Aurelia

### 5/5 — ㊗️1ヶ月になったよ㊗️

*2026-05-12*

私は1年前くらいにこのゲームを始めました。
でも、餌をやるのを忘れたり、鬱陶しいと思って通知をOFFにしたりして、殺してしまいました．
それがショックで、作っては死なせてしまう繰り返し、このアプリをアンインストールしました。
自分もリアルでうさぎを飼ってから、やらなくなりました。
そしてまた、「クラゲに会いたいなあ」って思って、またインストールしました。名前は、大好きな曲の、「Cinder」からとり、「しんだー」にしました。「しんだー！」って呼んだり、餌をあげたり、鑑賞モードにしたり、背景を変えたりして、すっごく可愛がっていました。餌をたくさんあげるとぜーんぶ食べるのがすっごく可愛くて、毎日あげて、1週間に一回、水を変える．を繰り返して、レビューを見て「もっと多い日数育てたい！」と思い、「しんだーは絶対に長く生きさせてあげる！」とも思いました．しんだーの為に苦手な早起きをしたりして、どうにかしてしんだーを可愛がりました．そのあと、1週間が経ちました。と、きてめちゃくちゃ喜びました。「嬉しい！もーっと！」と思い、全力で愛情たっぷりに育て、音楽が心地よくて、うさぎもとっても喜んでいました。そして、あっという間に1ヶ月になりました。可愛くて可愛くてたまりませんでした．米粒くらいの大きさから比べると、とっても大きくなっていました。これからも、しんだーを大事にします！本当に本当に楽しいゲームで大好きです！

### 5/5 — It’s great and I don’t actually forget about it

*2026-05-11*

The jellyfish can grow slowly but it’s fun to watch and see grow I feel so accomplished when it grows

### 5/5 — 素敵なゲームを有難うございます！

*2026-05-10*

2016年1月29日からずっと遊んでいる者です。

初代の海月ちゃんは1089日まで生きてくれましたが、私がスマホの引き継ぎを上手く出来なかったせいで亡くなってしまいました。
凄くショックでそれから暫くこのゲームから離れてしまいましたが、その後もう一度アプリを入れて育成している二代目の海月ちゃんは元気に1005日目を生きております。

前書きが長くなりましたが、今回は二代目が1000日突破した記念にレビューを書かせて頂きます。

まず、このゲームは毎日ログインする必要がないので、三日坊主な私でもかなり長く続いております。
空腹度が70になると通知で「𓏸𓏸が餌を欲しがっています」と表示されますし、それを無視して50になると「𓏸𓏸がかなり餌を欲しがっています」という表示に変わります。それから本当にヤバい20を切ると「𓏸𓏸がかなり餌を欲しがっています！」や、「水槽の水を変えてください」といった通知がされるので、通知を何回かスルーしてしまっても大丈夫な設定になっています。
また、音楽や照明を自分好みにカスタム出来る点も非常に素晴らしいです。私のオススメはライト：1、BGM：7ですね。

改善点という程でもありませんが、あったら良いなと思う設定が幾つかありますので、レビューに祈りを込めて書かせて頂きます。
まず、有料で広告をなしに出来たら良いなと思います。広告はゲームを開いた直後にバツ印を押して消すタイプの広告と水換えをする時に30秒程の広告が出るだけではありますが、私は多少高くても絶対にお布施を兼ねて課金します。
それから、クラゲの色や背景、音楽等の細かい設定を有料で出来たら良いなとも思います。現状でもグラフィックは十分過ぎる程素敵ですが、カスタムが出来ればもっと皆クラゲに愛着が湧くのかなと思います。

課金要素を組み込むのは恐らく相当面倒だとは思いますし、今のままでも大変素晴らしいゲームではありますが、開発者様の懐もより温まると思うので是非とも実装して頂きたいです。

長々と書いてしまいましたが、これからも二代目海月ちゃんを可愛がって行こうと思います。私がおばあちゃんになるまでこの子と一緒にいたいですね！

### 1/5 — Scared

*2026-03-29*

Hi, I love this app so much I have a loyal jellyfish named coyote Peterson. He is 285 days old now and I am really starting to worry he is getting really big and having a hard time moving around. I am wondering if he will eventually be able to have a bigger  tank because I can tell that he’ll eventually get so big he won’t be able to move. Obviously that would be really upsetting for me and I think I would have to simply delete the app and just know that he’s not alive anymore. PLS HELP ME!!!!

### 5/5 — I love this game

*2026-03-09*

I’ve go the axolotl one too and more and I love them all lmao. I’ve named my jellyfish ‘Jiggly Jiggly Jumbo Jimbo’.

### 5/5 — 己の命運を託したくらげ

*2026-03-06, version 5.0*

このアプリを入れたのは高校2年生の冬、ちょうど志望校が決定した時です。願掛けのつもりでクラゲを育成しようと思い、根性と名づけました。

勉強に勤しむ中でも休憩で餌をやるのが日課になり、日々大きくなっていく根性を見ると私も成長している感じがして受験勉強の支えになっていたことに間違いありません。第一志望には残念ながら行くことは叶いませんでしたが、根性と共に生き抜いた1年間は生涯の宝物です。

そして、受験が終了し大学生活をエンジョイすると同時に、

油断

したのでしょうね。気がつくと根性は死んでいました。スマホを持ったまま呆然としていたのを覚えています。自分のことにかまけて愛するペットを放置する。現代のペット飼育問題が露見してしまいました。このような思いをせぬよう、このアプリを通して社会にペット飼育についての姿勢について投げかけたいと思います。
現在根性No.3は元気にしています。

## Frequently asked questions about Jellyfish Aquarium

### What is Jellyfish Aquarium - Pet Game?

It is a virtual pet simulation game where you can raise your own jellyfish on your smartphone. You can feed it, clean its home, and watch its adorable movements. The game is designed to be simple, therapeutic, and a fun way to pass the time.

### How do I care for my virtual jellyfish?

Caring for your jellyfish is easy. You need to feed your pet once every four days and clean its home once a week. The app can also send you notifications to remind you when your pet needs attention.

### Is Jellyfish Aquarium - Pet Game free to play?

Yes, the core functions of the game, including raising your jellyfish and accessing all features, are free. The description states that all functions are free and do not require any microtransactions.

### Can I transfer my pet to a new device?

Yes, you can transfer your pet's data to a new device. This allows you to keep the same virtual jellyfish even after changing your mobile device, ensuring you don't lose your progress.

### Who would enjoy this game?

This game is recommended for people who have always wanted a jellyfish, love visiting zoos and aquariums, enjoy raising virtual pets, or are looking for a simple and fun game to pass their free time.

## Version history (last 5 releases)

### 5.0 — 2023-02-03

- bug fixes.

### 4.9 — 2021-08-28

-bug fix.

### 4.8 — 2021-08-10

- bug fix.

### 4.7 — 2021-07-29

Support for the latest iOS.

### 4.4 — 2017-01-30

This app has been updated by Apple to display the Apple Watch app icon.

- added the function to reset tank size.
- added new BGM.
- added new messages from jellyfish.

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## More apps by Hiroki Yamada

- [Rabbits on the Moon](https://appshunter.io/ios/app/rabbits-on-the-moon/id1009172094)
- [Marimo - Moss Ball Aquarium](https://appshunter.io/ios/app/marimo-moss-ball-aquarium/id1015123937)
- [Goldfish Aquarium - Japanese Style -](https://appshunter.io/ios/app/goldfish-aquarium-japanese-style/id1023207502)
- [Marimo Game Free](https://appshunter.io/ios/app/marimo-game-free/id1026490638)
- [Clownfish Aquarium](https://appshunter.io/ios/app/clownfish-aquarium/id1039907687)

All apps by Hiroki Yamada: https://appshunter.io/developer/491381849

## Related topics

[jellyfish pet](https://appshunter.io/ios/topics/jellyfish-pet) · [jellyfish simulator](https://appshunter.io/ios/topics/jellyfish-simulator) · [tamagotchi game](https://appshunter.io/ios/topics/tamagotchi-game) · [age regression](https://appshunter.io/ios/topics/age-regression) · [jelly fish](https://appshunter.io/ios/topics/jelly-fish) · [little space](https://appshunter.io/ios/topics/little-space)

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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 2026-08-25.*