Which Medaka Varieties are Easy to Keep? Which Improved Medaka are Easy to Raise?

Which types of medaka are easy to keep? I will explain which improved medaka are easy to raise.

If They Have a Normal Body Shape, There Isn’t Much Difference Between Easy-to-Keep and Difficult-to-Keep Medaka

If they have a normal body shape, there isn’t much difference between easy-to-keep and difficult-to-keep medaka.

Of course, some medaka might be weak due to many generations of inbreeding, but they are not extremely difficult to keep.

However, it’s a different story if the medaka have non-normal body shapes like the daruma type, hikari type, albino, or long-finned types. Especially daruma-type medaka are prone to diseases like swim bladder disease and pinecone disease, making them difficult to keep.

Hikari-type medaka are also weaker than normal body types because they are a kind of deformity. Even under the same conditions, only the hikari type might die. But if you keep them normally, there shouldn’t be much of an issue.

Long-finned medaka are almost the same as normal body types except for their long fins. They are not very difficult to keep, but their fins tear easily, and they have a higher risk of fin rot disease compared to regular medaka.

In fact, if you visit medaka shops, you will find that daruma-type medaka are rarely sold, and some breeders don’t farm them at all. It’s likely because they are difficult to manage.

There Are Especially Robust and Easy-to-Keep Medaka Varieties

However, there are some particularly robust and easy-to-keep medaka among the varieties. For example, wild black medaka or feed medaka are clearly more robust and easier to keep compared to improved varieties.

These robust and easy-to-keep medaka are less likely to get sick and lay eggs more easily even under the same conditions. Beginners should choose these easy-to-keep medaka for purchase.

Choosing Healthy Individuals Is More Important Than Choosing Easy-to-Keep Medaka

Moreover, choosing healthy individuals is much more important than choosing easy-to-keep medaka. No matter how strong the medaka you buy are, it is meaningless if they are already infected with disease. Choose medaka that are healthy and not infected with disease.


Recommended Easy-to-Keep Medaka Varieties

I will introduce types of medaka that are easy to keep.


Hinou Medaka

Hinou Medaka is the most popular improved medaka with a bluish-white body color and glowing back. It is very robust and easy to keep, recommended for beginners.

They are sold in many stores, including home centers. It is an easy-to-keep medaka that I can recommend to beginners.

Yang Guifei Medaka

Yang Guifei Medaka is also very robust and easy to keep. Its color is darker and more beautiful than regular feed medaka, making it one of the most widely distributed improved medaka in Japan.

However, in my opinion, Hinou is slightly stronger when kept in an aquarium. Nevertheless, it is among the top easy-to-keep medaka and is readily available in home centers.

White Medaka and Blue Medaka

White medaka and blue medaka are also commonly sold in home centers. Although many stores sell them cheaply, resulting in poor-condition individuals, they are generally robust and easy to keep.

Other Improved Medaka

Other improved medaka are not particularly weak if you keep them normally. Varieties like Sapphire, Oblivion, Night Cherry Blossom, and Ulysses are theoretically the same as feed medaka. However, be aware that medaka are prone to bacterial and parasitic infections from other fish.

Feed Medaka

Feed medaka are yellowish medaka, most familiar to Japanese people. They are extremely easy to keep and are widely raised in elementary schools. They are also inexpensive, sold for around a few tens of yen per fish.

Black Medaka

Black medaka, also known as Japanese medaka, are wild medaka that inhabit Japan. They are the original breed from which improved medaka were developed and have very strong vitality. They can swim even in rice fields in the scorching summer heat close to 40 degrees Celsius and in dirty ditches, making them very easy to keep even in captivity.

All Normal Body Type Medaka Are Equally Easy to Keep

Indeed, there are robust medaka like black medaka, but if they have a normal body shape, all medaka are equally easy to keep.

In fact, it has only been about 10 years since improved medaka were developed, and there aren’t any genetically weak varieties yet.

However, be cautious with abnormal body shapes like daruma medaka, as they are difficult to keep.


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