Medaka Encyclopedia

Albino individuals lacking melanin pigment. Characterized by red eyes and white body with a mystical atmosphere.

A pure white medaka with elongated fins like angel wings. Swallow-fin type white medaka.

Blue body color combined with hikari body type. Bluish body with silvery-blue external light creates cool and fantastical beauty. Especially beautiful in outdoor sunlight.

A fantastic medaka with semi-transparent scales and rainbow sheen. Aurora effect changes colors with light.

Improved medaka characterized by deep red color. Beautiful vivid crimson body color reminiscent of azami (thistle) flowers. Among red medaka, this variety is prized for its especially deep coloration.

Black body studded with lame scales like stars in the night sky. Orochi lineage crossed with lame scales.

A mystical medaka with glittering lame on a black body, like stars in the night sky.

A medaka with gentle pale cream body color. Calm coloring that matches Japanese-style containers well.

Short-bodied round medaka resembling a daruma doll. Rolling swimming motion is adorable. Requires warm water keeping.

Improved medaka with short, round daruma body type. Adorable plump form has high ornamental value. Warm water is essential for maintaining body shape.

An improved variety with deeper indigo than traditional blue medaka. Attractive deep blue color like the deep sea.

A medaka with fine lame sprinkled like powdery snow all over. Beauty reminiscent of winter snowscape.

A medaka with powerful scale shine reminiscent of a dragon. Iron mask type head gloss is particularly beautiful.

A medaka with sunset-like orange-red gradient. Popular for warm color tones.

A gorgeous medaka with five colors: red, white, black, blue, yellow. Multicolor like koi in water bowls.

A fantastical medaka reminiscent of a night sky galaxy. Beautiful combination of glitter and multiple colors.

Improved medaka with beautiful blue external body light. Named because the blue-white external light emanating from the back evokes a galaxy. Popular variety with fantastical beauty like a nighttime water surface.

Improved medaka with white body color and red eyes (albino). Named for its cute appearance resembling a white rabbit. Impressive contrast between clear white body and red eyes.

Multicolored glitter scattered across body radiates like fireworks. Lame changes to rainbow colors with light angle. Rapidly gaining popularity as a summer icon.

General term for medaka with reflective scales on back. Scales shimmer beautifully in sunlight. Various crosses with Miyuki.

The oldest improved medaka variety, kept since the Edo period. Friendly orange-yellow color and extreme hardiness. Perfect for biotope beginners.

Improved medaka with deep emerald green body reminiscent of jade. Green medaka are rare, with unique coloration popular among collectors. Color shifts with light angle.

Gorgeous variety combining red, white, and black tricolor with elongated fins. Beautiful combination of phoenix-like graceful long fins and complex body coloration. Advanced collector's variety.

Gorgeous golden body with shimmering lame scales. Named after the Hyaku Shiki from Gundam. Shines gold in top view.

Striking variety with jet-black body and yellow lame. Named for yellow flashes of lightning on black body. High ornamental value due to vivid contrast.

A beautiful medaka shining like Princess Kaguya from the tale. Hikari body with multicolor lame, a gorgeous variety.

Medaka variety with jet-black body. Darker than Black Diamond lineage, with fins also deeply black being most valued. Appreciated for understated beauty.

Premium modified medaka with multicolor lame scattered all over the body. Dazzling rainbow shimmer changes with light angle. Difficult to fix — for advanced keepers.

Improved medaka with beautiful golden body. Hikari body type with especially strong back shine. Gold gleam stands out viewed from above. Considered auspicious, popular as gifts.

Warm amber (tortoiseshell) body color. More subdued than Youkihi with refined, subtle beauty.

Medaka with red and white pattern like koi. Each individual has unique markings — every fish is one-of-a-kind.

Improved variety of Youkihi with even deeper crimson. Vivid red stands out on water surface, intensifies outdoors.

Red and white bicolor medaka like Kohaku koi. Each individual has unique markings. Color fixation is challenging, making selection deeply rewarding.

Improved Youkihi with deeper, more intense crimson. The name 'Koutei' reflects its regal red. Color deepens outdoors.

Superior variety with even deeper red than Youkihi. Transparent scales reveal internal organs, further emphasizing redness. Pursuing the ultimate in red coloration.

Black body with Miyuki external light and blue lame. Jet-black body with glittering blue lame creates a mystical night-sky appearance.

A beautiful medaka with glitter-like reflective scales scattered across the body. Shines in seven colors with light.

Deep lapis lazuli blue body evokes the gemstone. Combined with external light, emits a mystical glow. Most beautiful in dark containers viewed from above.

Representative black-body improved medaka. Known for deep black body color with overwhelming presence from its jet-black Orochi lineage. Relatively easy to keep even for beginners.

Deep blue body color reminiscent of the sea. Representative blue medaka variety derived from Miyuki lineage.

Medaka with elongated dorsal, caudal, and pectoral fins. Developed by Matsui fish farm. Gracefully flowing fins are best appreciated from the side.

Elegant improved medaka with pale pink body color accented with orange-red. Delicate coloring evokes Japanese aesthetics. Particularly beautiful when viewed from above in white containers.

Characterized by a metallic sheen along the back. Graded from weak to full-body (Tetsukamen) based on light coverage.

A fantastic medaka emitting pale light like moonlight. Internal light shines from head to back.

Transparent scales allow red, white, and black colors to appear like brocade fabric. Unique beauty with pigments floating in translucent body. Best viewed from above.

A gorgeous medaka with lame scales on orange body. Warm sparkle like sunset.

A popular variety featuring vivid orange color. Bred from Youkihi lineage with bright body coloration.

Jet-black medaka with no color fading from background adaptation. A fixed variety where depth of black determines value.

Beautiful modified medaka with red-orange body and external light. Named for the elegant glow like Princess Otohime of Ryugu Palace. Best appreciated from above.

Classic improved medaka with beautiful golden-shining body color. Body sparkles in sunlight, beautiful in tanks and outdoor containers. Easy to keep and suitable for beginners.

Luxurious improved medaka with orange-red body color and external body light. Beautiful combination of orange-red body and external body light on the back, appealing in both top-view and side-view.

A medaka with transparent scales making eye area appear black like a panda. Popular for cute appearance.

Medaka with elongated fins called swallow trait. Gracefully flowing fins reminiscent of phoenix feathers.

A unique medaka with irregular spotted patterns. Charm lies in different patterns per individual.

A beautiful medaka with platinum silver shine across the entire body, appearing rainbow-colored under certain light.

Improved medaka with refreshing soda-blue body color. Translucent blue is cool and eye-catching in summer outdoor keeping. Derived from Miyuki lineage.

Named for resemblance to Ranchu goldfish — no dorsal fin and round body. A Daruma subtype with uniquely charming form. Poor swimmer, so careful tank mate selection.

A beautiful variety with deep red color reminiscent of ruby gemstones. Some transparent-scale types show internal organs.

Rare medaka with greenish external light. Unlike the usual silver-white, the green external light creates a unique atmosphere. Rare and popular with collectors.

Medaka with sapphire-like blue shimmer. Combination of lame scales and blue body is enchanting. Relatively new variety.

Medaka where external light spreads across the body like stars. A band of light reminiscent of the Milky Way flows across the body. Premium variety, best viewed from above.

Medaka with scattered lame (glitter) creating a nebula-like fantasy shimmer. Blue-purple body with glitter is especially stunning viewed from above.

Medaka with deep blue body color reminiscent of the deep sea. Deeper and more mysterious blue than Marine Blue. Looks most beautiful in dark containers.

White body color combined with hikari body type. Pure white body glows with silvery external light. Hardy and easy to keep, suitable for beginners.

Improved medaka characterized by vivid vermilion body color. Beautiful deep vermilion color like shusha (vermilion mineral pigment containing mercury). Outstanding coloration among red medaka varieties.

Wild-type medaka native to Japanese streams and rice paddies. Simple yellowish-brown coloring evokes Japan's original landscape. Listed on the Environment Ministry's Red List.

Characterized by lame scales scattered like stars. Has sparkle like a starry sky river.

White body with only the head cap in red. Beautiful red-and-white like a Japanese crane. Color variant of Oranda.

A stunning variety combining tricolor (red, white, black) pattern with glittering lame scales. Koi-like beauty with sparkle — one of the most popular medaka. Selection breeding is deeply engaging.

A medaka with red, white, and black tri-color pattern like Nishikigoi. Each individual has unique patterns.

Characteristic improved medaka with arc-shaped (bow-shaped) external body light on the back. Beautiful arc of light reminiscent of a crescent moon runs along the back. High ornamental value, advanced-level variety.

A medaka with pure white body giving a clean impression. One of the most widely distributed basic varieties.

A refreshing medaka with yamabuki (bright yellow) body color. Brighter than Youkihi, closer to lemon shade.

Hikari body type of Youkihi Medaka. Silvery-white glow on the back combined with vivid orange-red coloration. Stunning when viewed from above.

Beautiful orange-red of Youkihi with elongated fins. Side view shows elegant flowing fins. Available in Matsui long-fin and Swallow types.

Beautiful deep orange-red medaka, popular since the beginning of the medaka boom. Hardy and easy to breed.

Enchanting medaka with pink lame scales on blue-black body. Named for resemblance to cherry blossoms at night.

Improved medaka with orange-to-red gradient reminiscent of sunset sky. Beautiful warm-color gradient body color. Popular variety that evokes the scenery of twilight when viewed.

Orange-red body with glitter and elongated swallow-type fins. Graceful swimming reminiscent of a phoenix. Extremely high ornamental value.