[2023] Carefully selected types of medaka! Recommended for beginners From standard varieties to popular latest varieties

What kind of fish is Medaka?

Features of Medaka


Medaka is a domestic freshwater fish that lives widely in rivers in Japan, and Japan has two species, Minami Medaka and Kitano Medaka, which are collectively called Medaka. The adult medaka is very small, about 3-4 cm in length. In nature, it lives in streams and ponds and eats small aquatic insects.


Many people may have raised killifish as part of their elementary school science classes. It is a fish that is very familiar to Japanese people, but in the last 10 years it has been actively improved, and many types (Improved killifish) has been produced.


Currently, it is said that there are 600 and 700 types of improved medaka. Furthermore, the number of varieties continues to increase year by year, and breeders all over the country are creating a wide variety of varieties.


Standard types and varieties of medaka

First of all, we will introduce types that are durable, easy to grow, and relatively inexpensive for those who want to start breeding medaka. Even though they are standard varieties, there are many variations, so please try to find your favorite.

black killifish

Wild Minami Medaka and Kitano Medaka are sold under this name. The number of black medaka is decreasing nationwide, and it is also a valuable fish that is designated as an endangered species.


It is a type in which the body that emerged by mutation from the black medaka is a fixed scarlet individual. The price is low and the distribution volume is large, making it a popular breed for beginners as an introductory species for breeding medaka.

white killifish

One of the introductory breeds with an elegant white body. Although it is a simple color, it is also very compatible with greenery such as aquatic plants.



It is characterized by its black panda-like eyes, and is called by its body color, such as red panda or white panda. It is one of the cheaper varieties among the improved varieties.


A type with a black body produced by 'Asuka Medaka' in Nara Prefecture. Before Orochi, there were various types of black medaka, such as Kuromine and Black Panda. Does not lose black color (does not fade)It is a type that has a characteristic of blackness that stands out conspicuously.


It's been a long time since it was created, but it's still a popular breed.

Yang Guifei Medaka

It is a red (orange) variety that pioneered improved medaka, and is now a standard variety that can be obtained from around 100 yen. The red color is even darker than that of the killifish, and it catches the eye even when kept in an aquarium or in a water lily bowl, and has a strong presence.


There is also a variety called Kotei, which pursues the redness of Yang Guifei.


East sky red (Eastern light)

It is a type with a characteristic form called the light body type in the vivid orange of Yang Guifei. The characteristics of light-type medaka can be fully enjoyed when viewed from the side, so it is recommended for those who cannot breed medaka outdoors (those who mainly breed in aquariums).

Miyuki Medaka

A popular improved medaka with a bluish glossy body. It is very durable and easy to grow, and the price is reasonable, just like Yokihi Medaka, so it is recommended for beginners.


Popular & Latest Improved Medaka Varieties (Types)

Next, we will introduce carefully selected varieties that are a bit maniacal and the latest varieties that have just been produced. Some of them have glittering scales and some have long fins.


It is a very gorgeous and beautiful variety with blue glitter on its back made by Seirakuan, which produces and sells killifish in Okayama Ken. Currently, there is a large amount of distribution, and it is considerably easier to obtain than when it was first released.


There is also a variety called sapphire without dorsal fin, which has no dorsal fin and the lame on the back is not interrupted from the head to the caudal fin.

mariage long fins

Medaka exchange meeting in Ehime Mr. Tarumizu created in 2021, a type of medaka with a characteristic that the fin grows and the tip becomes fluffy. Flashy fins reminiscent of tropical fish shocked the world of improved medaka.


Marriage long fins now have wider fins Marriage long fin kissing wide fin typeThe breed, and those with kissing fins have an emerald color, mariage kissing emerald fin typeare also produced.


Reiwa Black Lame Mikiyuki Sapphire (Reiwa Sapphire)

A sapphire produced by Seirakuan with red color on each fin, and the contrast between the red fin and blue lame is very beautiful and the latest popular variety. The gene that makes the fins of medaka, which has a dark body color, red is called the Reiwa gene.


At Seirakuan, improvements are being made to real long fin types with elongated fins, and Reiwa three-color lame, which has three-color patterns and red fins.


It is a medaka that emphasizes the blue color of the lame of a variety called Aurora yellow lame, and was named after the beautiful cobalt blue butterfly that lives in Australia.


The butterfly called Ulysses is also called the blue butterfly of happiness in the local area, and the name of this medaka seems to be very beneficial as well as its appearance. It will be a very popular breed all over the country.


It is one of the varieties of red and white lame and three-color lame produced by Joshu Medaka in Gunma Prefecture.


The lame density is very high, and the sparkling lame that covers the back is very popular with women. Red and white and three-color patterns have a low fixed rate, and it is difficult to keep increasing beautiful patterns, but it is a perfect breed to enjoy the real pleasure of improvement.

cherry blossoms at night

Created by the aforementioned Mr. Tarumi, it is a popular breed with a pink head and a darker body color with lame. It is also the type that is the base of many lame-type killifish that are currently being produced, and it is very popular because of its characteristics that are perfect for naming.


Today, there are a wide variety of types, such as Yozakura Gold, which is yellowish all over the body, and the persimmon-colored Yozakura Tancho type, which is reddish only on the head, and each boasts high popularity.


Five types

It is a very astringent medaka with the expression "black rim" created by the medaka shop "Shiira medaka" in Saitama Prefecture. It has a black-based body color with dark red in the fins, which is a little different from lame medaka.


Type 5 also has various derivative variations, such as type 5 type R, type 5 type B, and GOD.

black diamond

It is a kind of medaka that looks like a black gem with a black body color as the base and lame on the body side. In the past, there were many people who enjoyed medaka from the top, but recently this type of medaka has become popular.


This type was created by Mr. Nakazato in Kanagawa Prefecture, who created the Real Longfin and Platinum Hoshikawa varieties.

Red thistle

One of the most popular black rim varieties. The contrast between red and black is solid, and like Go-Shiki, it boasts a deep-rooted popularity among certain maniacs.


Unusual medaka varieties (types)

The types of medaka introduced above are also quite unique, but I picked up some more unique medaka, such as names and appearances.

mackerel extremity

It's a medaka with a very strange name, but when you look at it from the side, it lives in the sea. bluish shiny scales like mackerelIt has this name because it has


Improved medaka is often viewed in a black container, but this breed stands out even when viewed in a white container or aquarium, and is very beautiful.


It is a breed created by extending the fins of the albino Yang Guifei, which is said to require a knack for breeding, adding a feature called grape eyes, and using a complex gene called a light body type.


The breeding difficulty and the difficulty of successive generations are top class, but the mystery of albino has a charm that other medaka types do not have.

dragon's eye

It is the same albino Miyuki Hirenaga type breed as Himiko. Created by Shizuoka Prefecture's breeder Nekomeshi, it is still a popular breed. The name doesn't look like medaka, but it's a nice variety name that expresses the characteristics and image of this medaka well.


wings of oblivion

Aurora yellow lame fin naga type, with lame on the reddish black body color and long fins. The appearance of swimming with its long, fluttering fins is very elegant.


It is a variety created by Maimedaka, a medaka specialty store in Kumamoto, and many other varieties with unique names such as Ice Break, Gekka Bijin, and Tsukigami have been released to the world.


The name of medaka may be the most difficult to read. This breed was released by Hoshida Medaka, a breeder in Okayama Prefecture, and has the complex characteristics of a black rim light body type and long fins.

Variety of improved medaka, different ways to enjoy them

There are many types of medaka


Even today, new types of medaka are being created one after another. Medaka is relatively easy to breed and the cycle of generation change is fast, so one of the pleasures of breeding medaka is to purchase various types of medaka and create original varieties by crossing them.


You can find your favorite type of medaka and breed it carefully, or you can try crossing several types with the aim of creating your own original medaka. There are many ways to enjoy the breeding style, such as water lily bowls and aquariums.


Please refer to this article and enjoy breeding killifish in a style that suits you.

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Introducing carefully selected types of medaka, from the standard to the latest popular varieties